POLYFUSE PTC SELECTION GUIDE

Transcription

1 POLYFUS PTC SLCTION GUID Surface Mount attery Strap Radial Leaded High Voltage Radial Leaded

2 PTC Characteristics and Terminology polymeric PTC (positive temperature coefficient) overcurrent protector is an element placed in series with the circuit or assembly to be protected. The PTC element protects the circuit by changing from a low-resistance to a high resistance state in response to an overcurrent. This function is called tripping of the overcurrent protection device. Overcurrent circuit protection can be accomplished with the use of either a traditional fuse or the more recently developed resettable PTC. oth devices function by reacting to the heat generated by the excessive current flow in the circuit. The fuse element melts open, interrupting the current flow, while the PTC changes from low resistance to high resistance to limit current flow. The graph below shows the response of the PTC device to temperature. Log resistance (ohms) Trip Point LKG CURRNT: PTC is said to have tripped when it has transitioned from its low resistance state to a high resistance state due to overload current. Protection is accomplished by limiting the current flow to a low leakage level. Leakage current can range from less than a hundred milliamps at rated voltage up to a few hundred milliamps at lower voltages. The fuse on the other hand completely interrupts the current flow and this open circuit results in no leakage current after it has been subjected to an overload current. FULT CURRNT: The PTC is rated for a maximum short circuit current at rated voltage. This fault current level is the maximum current that the device can safely limit keeping in mind that the PTC will not actually interrupt the current flow (see LKG CURRNT above). The typical short circuit rating of a board-mounted PTC is 40; for battery strap PTCs, this value can reach 100. Fuses do in fact interrupt the current flow in response to the overload and the range of interrupting ratings vary from tens of amperes up to 10,000 amperes at rated voltage. OPRTING VOLTG RTING: General use PTCs are not rated above 60V while fuses are rated up to 600V. HOLD CURRNT RTING: The hold (operating) current rating for PTCs can be up to 14 while the maximum level for fuses can exceed 30. TMPRTUR DRTING: The useful upper limit for a PTC is generally 85 C while the maximum operating temperature for fuses is 125 C. The following temperature derating curves (see chart at bottom of page) that compare PTCs to fuses illustrate that more derating is required for a PTC at a given temperature. dditional operating characteristics can be reviewed by the circuit designer in making the decision to choose a PTC or a fuse for overcurrent protection. GNCY PPROVLS: PTCs are Recognized under the Component Program of Underwriters Laboratories to UL Standard 1434 for Thermistors. The devices have also been approved for use in Canada by Underwriters Laboratories. pprovals for fuses include Recognition under the Component Program of Underwriters Laboratories and the CS Component cceptance Program. In addition, many fuses are listed in accordance with UL/CS/NC (Mexico) , Supplemental Fuses. RSISTNC: Reviewing product specifications indicates that similarly-rated PTCs have about twice (sometimes more) the resistance of fuses. TIM-CURRNT CHRCTRISTIC: Comparing the time-current curves of PTCs to time-current curves of fuses show that the speed of response for a PTC is similar to the time delay of a Slo-lo fuse. Temperature ( C) Understanding the differences in performance between the two types of devices will make the best circuit protection choice easier. The most obvious difference is that the PTC is resettable. This is an inherent characteristic in which the PTC resets (returns to low resistance state) after power is removed and the device cools down. There are a number of other operating characteristics that differentiate the two types of products. The terminology used for PTCs is often similar but not the same as for fuses. Two parameters that fall into this category are leakage current and fault current rating. Temperature Derating Curves Comparing PTCs to Fuses Chart Key Curve Thin-Film Fuses and 313 Series (.010 to.150) Curve FLT-PK, Telelink, Nano 2, PICO, lade Terminal, Special Purpose and other leaded and cartridge fuses (except ) Curve C Resettable PTCs PRCNT OF RTING C -76 F C -40 C -40 F -20 C -4 F 25 C 0 C 20 C 40 C 60 C 80 C 32 F 68 F 104 F 140 F 176 F MINT TMPRTUR C 100 C 212 F 120 C 248 F 2

3 Selection Process 1. Determine the following circuit operating parameters: Normal operating current I HOLD Maximum circuit voltage V MX Maximum interrupt current I MX mbient operating temperature 2. Select the suitable form factor. 3. Compare the PTC data sheet ratings on littelfuse.com for V MX and I MX to ensure that the circuit parameters do not exceed these ratings. 4. Verify that the ambient operating temperature within close proximity to the device is within its normal operating range. Thermally derate I HOLD and I MX as necessary. See equation below. I HOLD = I MX Thermal derating factor 5. Check that the trip time protects the circuit. 6. Verify that the post trip resistance (R1 MX ) of the device is taken into account in the circuit design. 7. Independently test and evaluate the suitability and performance of the PTC in the actual application. PTC Selection Table SURFC MOUNT RDIL LDD Series Name 0805L 1206L 1210L 1812L 2016L 2920L USR 30R Photos Chip Size 0805 (2012) 1206 (3216) 1210 (3225) 1812 (4532) 2016 (5041) 2920 (7351) Hold Current (I HOLD ) Max voltage (V MX ) 15V 30V 30V 60V 60V 60V 16V 30V Max fault current (I MX ) Operating Temperature Range -40 C to 85 C -40 C to 85 C -40 C to 85 C -40 C to 85 C -40 C to 85 C -40 C to 85 C -40 C to 85 C -40 C to 85 C gency approval culus, TUV culus, TUV culus, TUV culus, TUV culus, TUV culus, TUV culus, TUV culus, TUV RoHS Compliant Yes Yes Yes Yes Yes Yes Yes Yes Lead-Free Yes Yes Yes Yes Yes Yes Yes Yes COMPTITOR CROSS Tyco/Raychem Series nano SMD micro SMD mini SMD mid SMD SMD RUS RU mp Rating N Max voltage N 6V 6-30V 6-60V 6-60V 6-60V 16V 30V ourns Series MF-NSMF MF-USMD MF-MSMD MF-SMDF MF-SM MF-R mp Rating N N Max voltage N 6-30V 6-30V 6-30V 10-60V 6-60V N 30V NO = Not offered PTC Selection Table (cont.) TTRY STRP (XIL LDD) Series Name 60R 250R 600R ST LT LR VT VL Photos Chip Size Hold Current (I HOLD ) Max voltage (V MX ) 60V 60/250V 60/600V 15/24V 15/24V 15/20V 16V 12V Max fault current (I MX ) 40 3/10 3/ Operating Temperature Range -40 C to 85 C -40 C to 85 C -40 C to 85 C -40 C to 85 C -40 C to 85 C -40 C to 85 C -40 C to 85 C -40 C to 85 C gency approval culus, TUV culus, TUV culus, TUV culus, TUV culus, TUV culus, TUV culus, TUV culus, TUV RoHS Compliant Yes Yes Yes Yes Yes Yes Yes Yes Lead-Free Yes Yes Yes Yes Yes Yes Yes Yes COMPTITOR CROSS Tyco/Raychem Series RX TR250 TR600 SRP LTP LR4 VTP VLR mp Rating Max voltage 60-72V 60/250V 60/600V 15/30V 24V 15/20V 16V 16V ourns Series MF-R/MF-RX MF-R/250 MF-R/600 MF-S MF-LS MF-LR MF-VS mp Rating N Max voltage 60V 60/250V 60/600V 15-30V 15-24V 15-20V 16V N N = Not vailable 5

4 PTC pplications PTCs are used as circuit protection in applications where sensitive components are at risk of damage from overcurrent conditions. The ability of PTCs to reset themselves after exposure to a fault current makes them ideal for use in circuits that are not easily accessible to a user or technician. Typical applications include port protection on personal computers (US, Firewire, keyboard/mouse, and serial ports), peripherals (hard drives, video cards, and hubs), cell phone, battery packs, industrial controls, lighting ballast and motor controls. When to apply a resettable PTC vs. a traditional fuse is always the choice of the designer or technician but in some cases, PTC s offer a convenient form of circuit protection to improve the reliability of an application. There is an important area of applications where the use of resettable fuses (PTCs) has become a requirement. Much of the design work for personal computers and peripheral devices is strongly influenced by the Microsoft and Intel System Design Guide which states that Using a fuse that must be replaced each time an overcurrent condition occurs is unacceptable. nd the SCSI (Small Computer Systems Interface) Standard for this large market includes a statement that...a Positive Temperature Coefficient device must be used instead of a fuse, to limit the maximum amount of current sourced. The application selection guide below should be used as an aid in selecting the proper device for your end application. Please consult the datasheets on for detailed technical specifications. Telecom Computer Consumer lectronics attery SURFC MOUNT RDIL LDD TTRY STRP (XIL LDD) Series Name 0805L 1206L 1210L 1812L 2016L 2920L USR 30R 60R 250R 600R ST LT LR VT VL pplication Ul60950,TI-968-, GR-1089 Requirements X X ITU-T Recoomendations X X CP (Customer Premises quipment) X X nalog Line Card X X T1/1/J1 nd HDSL X X ISDN X X DSL X X Cable Telephony X X PX/KTS nd Key Telephone System X X CPU X X US X X X X X I1284 Parallel Data us X X X X I X X X I 1394 X X X I/O Ports X X X X X PC Card X X X X X X SCSI X X X X X Video Port X X X X X LCD Monitor X X X X X Set Top ox X X X X Loudspeaker X Smart Card Reader X Mobile Phone X X X Linear C/DC dapter X X X X X X X Portable lectronic Input Port X X X X X lectromagnetic Loads, Motor X X X X Solenoid Protection X X X X Lithium Cell X X X X X attery Pack X X X X X Medical electronic Voltage / Current Input Terminal X X NOT: The application summary is for reference only. Determination of suitability for a specific application is the responsibility of the customer. 3

5 Littelfuse offers a full range of battery strap, surface mount and radial leaded resettable PTC devices designed to protect applications where overcurrent protection is required. The following are typical examples of circuits using POLYFUS resettable PTCs in combination with other Littelfuse circuit protection devices to provide complete protection for the circuit. Contact your location Littelfuse application expert for additional design assistance or visit Power Over thernet Li-ion attery Pack Swtich/Hub Powered nd Station attery Connector attery Controller IC Data Pair Power Source quipment (PS) Powered Device (PD) Data Pair Cell Phone (3) V5.5ML0402 (Multilayer Varistor) attery + attery - Control Signal Ground Data Pair Data Pair Shield Ground US 1.1 US 2.0 US Port US Controller V5.5ML0603 US Port US Controller V5.5ML063 Outside World 1206L150 (2) V0402MHS03 VU D+ D - Signal Ground Outside World 1206L150 (2) PG (PulseGuard SD Suppressor) VUS D+ D - Signal Ground Shield Ground Shield Ground I 1394 FireWire Tip/Ring circuit Metallic Outside World 1394 Port 1394 Controller V33ML L110/33 (4) PG (PulseGuard SD Suppressor) Shield Ground VU TP+ TP- TP+ TP- Signal Ground RJ11 Connector Telco 600R Series 250R Series SMD/leaded SIDCtor Device Tx/Rx Circuits Tip Ring Signal Ground 4

6 World Headquarters Littelfuse, Inc Northwest Highway Des Plaines, IL US International Sales, Distribution and ngineering Facilities: North merica irmingham, Michigan US Des Plaines, Illinois US and Irving, Texas US Technical ssistance Phone: Fax: urope Dünsen, Germany Phone: Fax: Munich, Germany Phone: Fax: Utrecht, The Netherlands Phone: Fax: Swindon, ngland Phone: Fax: sia/pacific Hong Kong, China Phone: Fax: eijing, China Phone: Fax: Shanghai, China Phone: Fax: Shenzhen, China Phone: Fax: Singapore Phone: Fax: Yokohama, Japan Phone: Fax: Seoul, Korea Phone: Fax: Taipei, Taiwan Phone: Fax: Central and South merica São Paulo, rasil Phone: Fax: Research and Manufacturing Facilities: rcola, Illinois US Des Plaines, Illinois US Dongguan, China Dundalk, Ireland Dünsen, Germany Irving, Texas US Lipa City, Philippines Matamoros, Mexico Piedras Negras, Mexico Suzhou, China Swindon, ngland Witten, Germany Wuxi, China Yangmei, Taiwan FORM NO. C327- November 2006, Littelfuse Inc. Printed in U.S.. Specifications, descriptions and illustrative material in this literature are as accurate as known at the time of publication, but are subject to change without notice.

7 POLYSWITCH RSTTL DVICS Littelfuse s PolySwitch radial-leaded products represent the most comprehensive and complete set of PPTC products available in the industry today. RGF series for hold currents up to 14 RHF series for flatter thermal derating and operating temperatures up to 125 C RUF series for balance of voltage rating (30V) and hold current (up to 9) RUSF series for fast time-to-trip and low-resistance computer applications RXF series for low hold currents (down to 50m) and high voltage rating (up to 72V) RKF series for balance of voltage rating (60V) and hold current (up to 5) Now offering halogen free versions of all products NFITS Many product choices help provide engineers more design flexibility Compatible with high-volume electronics assembly ssists in meeting regulatory requirements Higher voltage ratings allow use in new applications FTURS RoHS compliant Halogen free (refers to: r 900ppm, Cl 900ppm, r+cl 1500ppm) roadest range of radial-leaded resettable devices available in the industry Current ratings from 50m to 15 Voltage ratings from 6V (computer and electronic applications) to 72V gency recognition : UL, CS, TÜV, CQC** Fast time-to-trip Low resistance PPLICTIONS Satellite video receivers Industrial controls Transformers Modems CD-ROMs Game machines Phones Fax machines nalog and digital line cards Printers Intelligent appliance Robotic machine Power supply Security Lighting Medical application **CQC only applies to RXF, RUF family parts RoHS Compliant, LV Compliant HF Halogen Free Specifications subject to change without notice Littelfuse, Inc.

8 pplication Selection Guide The guide below lists PolySwitch radial-leaded devices that are typically used in each of the applications described. Specifications for the suggested device part numbers can be found in this section. Once a part number has been selected, the user should evaluate and test each product for its intended application. PolySwitch Resettable Devices Key Selection Criteria Protection pplication Small Size Flatter Derating Lower Current Higher Voltage lectromagnetic Loads RGF (<16V), RUF (<30V) RHF (<16V) RXF (<72V), RKF (<60V) Halogen Lighting RGF (<16V), RUF (<30V) RHF (<16V) RXF (<72V), RKF (<60V) Lighting allast RXF (<72V) Loudspeakers RXF (<72V) RXF (<72V), RKF (<60V) Medical quipment RGF (<16V), RUF (<30V) RHF (<16V) RXF (<72V), RKF (<60V) MOSFT Devices RGF (<16V), RUF (<30V) RHF (<16V) RXF (<72V), RKF (<60V) Motors, Fans and lowers RXF (<72V), RGF (<16V) RHF (<16V) POS quipment RXF (<72V), RUF (<30V) Process and Industrial Controls RXF (<72V), RUF (<30V) Satellite Video Receivers RGF (<16V), RUF (<30V) RHF (<16V) RXF (<72V), RKF (<60V) Security and Fire larm Systems RGF (<16V), RUF (<30V) RHF (<16V) RXF (<72V), RKF (<60V) Test and Measurement quipment RGF (<16V), RUF (<30V) RHF (<16V) RXF (<72V), RKF (<60V) Transformers RGF (<16V), RUF (<30V) RHF (<16V) RXF (<72V), RKF (<60V) DDC Computer and Consumer lectronics RUF (<30V) Mouse and Keyboard RUF (<30V) SCSI RUF (<30V) US RUSF (<16V) Traces and Printed Circuit oard Protection RGF (<16V), RUF (<30V) RHF (<16V) RXF (<72V), RKF (<60V) Note : This list is not exhaustive. Littelfuse welcomes customer input for additional application ideas for PolySwitch resettable devices. Table R1 Product Series - Current Rating, Voltage Rating/Typical Resistance Voltage Rating RXF 72V RKF 60V RXF 60V RUF 30V RGF 16V RHF 16V RHF 30V RUSF 16V RUSF 6V Hold Current () Ω Ω Ω Ω Ω Ω Ω Ω 0.425Ω 0.68Ω Ω 0.350Ω Ω Ω 0.295Ω 0.140Ω Ω 0.255Ω 0.095Ω 0.100Ω Ω Ω 0.225Ω 0.075Ω 0.075Ω Ω Ω 0.165Ω 0.060Ω 0.060Ω Ω Ω 0.150Ω 0.050Ω 0.050Ω Ω 0.106Ω 0.045Ω 0.045Ω Specifications subject to change without notice Littelfuse, Inc. HF Halogen Free RoHS Compliant, LV Compliant

9 Table R1 Product Series - Current Rating, Voltage Rating/Typical Resistance Voltage Rating RXF 72V RKF 60V RXF 60V RUF 30V RGF 16V RHF 16V RHF 30V RUSF 16V RUSF 6V Hold Current () Ω Ω 0.063Ω 0.030Ω Ω 0.030Ω Ω 0.040Ω 0.035Ω Ω Ω Ω 0.029Ω Ω 0.020Ω Ω Ω Ω Ω 0.020Ω Ω Ω Ω Ω Ω Ω Ω Ω Ω Ω Ω Ω Ω Ω Ω Ω Ω Ω Ω Ω Ω Ω Ω Ω Ω Table R2 Thermal Derating [Hold Current () at mbient Temperature ( C)] Part Maximum mbient Temperature Number -40 C -20 C 0 C 20 C 25 C 40 C 50 C 60 C 70 C 85 C 125 C RXF 60V RXF RXF RXF RXF 72V RXF RXF RXF RXF RXF RXF RXF RXF RXF RXF RXF RXF RXF RXF RXF RoHS Compliant, LV Compliant HF Halogen Free Specifications subject to change without notice Littelfuse, Inc.

10 Table R2 Thermal Derating [Hold Current () at mbient Temperature ( C)] Part Maximum mbient Temperature Number -40 C -20 C 0 C 20 C 25 C 40 C 50 C 60 C 70 C 85 C 125 C RKF 60V RKF RKF RKF RKF RKF RKF RKF RKF RKF RKF RKF RKF RKF RUF 30V RUF RUF RUF RUF RUF RUF RUF RUF RUF RUF RUF RUF RUF RHF 30V - High Temperature RHF RHF RHF RUSF 16V RUSF RUSF RUSF RUSF RUSF RUSF RGF 16V RGF RGF RGF RGF RGF RGF RGF Specifications subject to change without notice Littelfuse, Inc. HF Halogen Free RoHS Compliant, LV Compliant

11 Table R2 Thermal Derating [Hold Current () at mbient Temperature ( C)] Part Maximum mbient Temperature Number -40 C -20 C 0 C 20 C 25 C 40 C 50 C 60 C 70 C 85 C 125 C RGF 16V RGF RGF RGF RGF RGF RHF 16V - High Temperature RHF RHF RHF RHF RHF RHF RHF RHF RHF RHF RHF RHF RHF RHF RHF RHF RUSF 6V RUSF RUSF RUSF Figures R1-R5 Thermal Derating Curve RXF Figure R1 200 % of Rated Hold and Trip Current mbient Temperature ( C) RoHS Compliant, LV Compliant HF Halogen Free Specifications subject to change without notice Littelfuse, Inc.

12 Figures R1-R5 Thermal Derating Curve RKF Figure R2 200 % of Rated Hold and Trip Current mbient Temperature ( C) = RUSF075, RUSF120, RUSF155 Figure R3 200 = RUF, and all other RUSF % of Rated Hold and Trip Current mbient Temperature ( C) RHF Figure R4 200 % of Rated Hold and Trip Current mbient Temperature ( C) Specifications subject to change without notice Littelfuse, Inc. HF Halogen Free RoHS Compliant, LV Compliant

13 Figures R1-R5 Thermal Derating Curve RGF Figure R5 200 % of Rated Hold and Trip Current mbient Temperature ( C) Table R3 lectrical Characteristics Part Number RXF 60V I H I T V MX I MX P D Typ Max Time-to-trip R MIN R MX R 1MX Lead Size [mm 2 (WG)] () () (V DC ) (V C RMS ) (DC DC ) (C RMS ) (W) () (s) (Ω) (Ω) (Ω) RXF [0.128mm 2 (26)] RXF [0.205mm 2 (24)] RXF [0.205mm 2 (24)] RXF 72V RXF [0.205mm 2 (24)] RXF [0.205mm 2 (24)] RXF [0.205mm 2 (24)] RXF [0.205mm 2 (24)] RXF [0.205mm 2 (24)] RXF [0.205mm 2 (24)] RXF [0.205mm 2 (24)] RXF [0.205mm 2 (24)] RXF [0.520mm 2 (20)] RXF [0.520mm 2 (20)] RXF [0.520mm 2 (20)] RXF [0.520mm 2 (20)] RXF [0.520mm 2 (20)] RXF [0.520mm 2 (20)] RXF [0.520mm 2 (20)] RoHS Compliant, LV Compliant HF Halogen Free Specifications subject to change without notice Littelfuse, Inc.

14 Table R3 lectrical Characteristics Part Number RKF 60V I H I T V MX I MX P D Typ Max Time-to-trip R MIN R MX R 1MX Lead Size [mm 2 (WG)] () () (V DC ) (V C RMS ) (DC DC ) (C RMS ) (W) () (s) (Ω) (Ω) (Ω) RKF [0.205mm 2 (24)] RKF [0.205mm 2 (24)] RKF [0.205mm 2 (24)] RKF [0.205mm 2 (24)] RKF [0.520mm 2 (20)] RKF [0.520mm 2 (20)] RKF [0.520mm 2 (20)] RKF [0.520mm 2 (20)] RKF [0.520mm 2 (20)] RKF [0.520mm 2 (20)] RKF [0.520mm 2 (20)] RKF [0.520mm 2 (20)] RKF [0.520mm 2 (20)] RUF 30V RUF [0.205mm 2 (24)] RUF [0.205mm 2 (24)] RUF [0.205mm 2 (24)] RUF [0.205mm 2 (24)] RUF [0.205mm 2 (24)] RUF [0.205mm 2 (24)] RUF [0.520mm 2 (20)] RUF [0.520mm 2 (20)] RUF [0.520mm 2 (20)] RUF [0.520mm 2 (20)] RUF [0.520mm 2 (20)] RUF [0.520mm 2 (20)] RUF [0.520mm 2 (20)] RHF* 30V - High Temperature RHF [0.205mm 2 (24)] RHF [0.205mm 2 (24)] RHF [0.205mm 2 (24)] RUSF 16V RUSF [0.205mm 2 (24)] RUSF [0.205mm 2 (24)] RUSF [0.205mm 2 (24)] RUSF [0.205mm 2 (24)] RUSF [0.205mm 2 (24)] RUSF [0.205mm 2 (24)] RGF* 16V RGF [0.205mm 2 (24)] RGF [0.520mm 2 (20)] RGF [0.520mm 2 (20)] RGF [0.520mm 2 (20)] RGF [0.520mm 2 (20)] RGF [0.520mm 2 (20)] RGF [0.520mm 2 (20)] RGF [0.520mm 2 (20)] RGF [0.520mm 2 (20)] RGF [0.520mm 2 (20)] RGF [0.823mm 2 (18)] RGF [0.823mm 2 (18)] Specifications subject to change without notice Littelfuse, Inc. HF Halogen Free RoHS Compliant, LV Compliant

15 Table R3 lectrical Characteristics Part Number I H I T V MX I MX P D Typ Max Time-to-trip R MIN R MX R 1MX Lead Size [mm 2 (WG)] () () (V DC ) (V C RMS ) (DC DC ) (C RMS ) (W) () (s) (Ω) (Ω) (Ω) RHF* 16V - High Temperature RHF [0.205mm 2 (24)] RHF [0.520mm 2 (20)] RHF [0.520mm 2 (20)] RHF [0.520mm 2 (20)] RHF [0.520mm 2 (20)] RHF [0.520mm 2 (20)] RHF [0.520mm 2 (20)] RHF [0.520mm 2 (20)] RHF [0.520mm 2 (20)] RHF [0.520mm 2 (20)] RHF [0.520mm 2 (20)] RHF [0.520mm 2 (20)] RHF [0.520mm 2 (20)] RHF [0.823mm 2 (18)] RHF [0.823mm 2 (18)] RHF [0.823mm 2 (18)] RUSF 6V RUSF [0.205mm 2 (24)] RUSF [0.205mm 2 (24)] RUSF [0.205mm 2 (24)] Notes: I H : Hold current: maximum current device will pass without interruption in 20 C still air. I T : Trip current: minimum current that will switch the device from low resistance to high resistance in 20 C still air. V MX : Maximum continuous voltage device can withstand without damage at rated current. I MX : Maximum fault current device can withstand without damage at rated voltage. P D : Power dissipated from device when in the tripped state in 20 C still air. R MIN : Minimum resistance of device as supplied at 20 C unless otherwise specified. D R MX : Maximum resistance of device as supplied at 20 C unless otherwise specified. D D D R 1MX : Maximum resistance of device when measured one hour post reflow (surface-mount device) D or one hour post trip (radial-leaded device) at 20 C unless otherwise specified. D * lectrical characteristics determined at 25 C. C F C F C C C CL to C C C L F C L to C L L C L F C L CL to C C to LC to C L L CL to C L C L C L CL to C L C L Figures R6-R14 Dimension Figures Figure R6 Figure R7 Figure R8 D D C CL to C L C F CL to C L C L C L D D D D C C F F CL to C C L Cto C L CL toc L to C L C L C L C F L F C L C L C L C L D D D C C F F CL to C L Cto C L C L C L C L F C L CL to C L C L C L C C to L Figure R9 Figure R10 Figure R11 D C F CL to C L C L C L D D D C C F F CL to C L Cto C L CL to C L C L C L CF L C L C L C L D D D C C F F CL to C L Cto C L C L C L CF L C L CL to C L C L C L C C t L RoHS Compliant, LV Compliant HF Halogen Free Specifications subject to change without notice Littelfuse, Inc.

16 Figures R6-R14 Dimension Figures Figure R12 Figure R13 Figure R14 J J C H D C F CL to C L C L C L Table R4 Dimensions and Weights Part Number RXF 60V Dimensions in Millimeters (Inches) C D F H J Min Max Min Max Min Max Min Max Min Max Typ Typ Typ Figure Device Mass (g) (Only for Reference) RXF R7, R13, (0.32) (0.33) (0.17) (0.23) (0.30) (0.12) (0.042) (0.04) R14 RXF R8, R13, (0.29) (0.46) (0.17) (0.23) (0.30) (0.12) (0.042) (0.04) R14 RXF R8, R13, (0.29) (0.50) (0.17) (0.23) (0.30) (0.12) (0.066) (0.07) R14 RXF 72V RXF R8, R13, (0.29) (0.46) (0.17) (0.23) (0.30) (0.12) (0.046) (0.04) R14 RXF R8, R13, (0.29) (0.50) (0.17) (0.23) (0.30) (0.12) (0.046) (0.04) R14 RXF R8, R13, (0.29) (0.50) (0.17) (0.23) (0.30) (0.12) (0.046) (0.04) R14 RXF R8, R13, (0.30) (0.53) (0.17) (0.23) (0.30) (0.12) (0.046) (0.05) R14 RXF R8, R13, (0.31) (0.54) (0.17) (0.23) (0.30) (0.12) (0.046) (0.05) R14 RXF R8, R13, (0.37) (0.57) (0.17) (0.23) (0.30) (0.12) (0.046) (0.06) R14 RXF R8, R13, (0.40) (0.60) (0.17) (0.23) (0.30) (0.12) (0.046) (0.06) R14 RXF R8, R13, (0.44) (0.62) (0.17) (0.23) (0.30) (0.12) (0.046) (0.06) R14 RXF R9, R13, (0.50) (0.69) (0.17) (0.23) (0.30) (0.12) (0.054) (0.05) R14 RXF R9, R13, (0.57) (0.75) (0.17) (0.23) (0.30) (0.12) (0.054) (0.05) R14 RXF R9, R13, (0.64) (0.82) (0.17) (0.23) (0.30) (0.12) (0.054) (0.06) R14 RXF R9, R13, (0.69) (0.88) (0.17) (0.23) (0.30) (0.12) (0.054) (0.06) R14 RXF R9, R13, (0.82) (1.00) (0.37) (0.43) (0.30) (0.12) (0.054) (0.07) R14 RXF R9, R13, (0.94) (1.13) (0.37) (0.43) (0.30) (0.12) (0.054) (0.07) R14 RXF R9, R13, (1.07) (1.25) (0.37) (0.43) (0.30) (0.12) (0.054) (0.07) R14 Specifications subject to change without notice Littelfuse, Inc. HF Halogen Free RoHS Compliant, LV Compliant

17 Table R4 Dimensions and Weights Part Number RKF 60V Dimensions in Millimeters (Inches) C D F H J Min Max Min Max Min Max Min Max Min Max Typ Typ Typ Figure Device Mass (g) (Only for Reference) RKF R10, R13, (0.28) (0.45) (0.17) (0.23) (0.30) (0.14) R14 RKF R10, R13, (0.28) (0.48) (0.17) (0.23) (0.30) (0.14) R14 RKF R10, R13, (0.31) (0.48) (0.17) (0.23) (0.30) (0.14) R14 RKF R10, R13, (0.31) (0.55) (0.17) (0.23) (0.30) (0.14) R14 RKF R10, R13, (0.30) (0.59) (0.17) (0.23) (0.30) (0.16) R14 RKF R11, R13, (0.40) (0.67) (0.17) (0.23) (0.30) (0.15) R14 RKF R11, R13, (0.48) (0.72) (0.17) (0.23) (0.30) (0.15) R14 RKF R11, R13, (0.51) (0.74) (0.17) (0.23) (0.30) (0.15) R14 RKF R11, R13, (0.55) (0.81) (0.17) (0.23) (0.30) (0.12) R14 RKF R11, R13, (0.65) (0.83) (0.17) (0.23) (0.30) (0.12) R14 RKF R11, R13, (0.65) (0.99) (0.37) (0.43) (0.30) (0.12) R14 RKF R11, R13, (0.83) (0.98) (0.37) (0.43) (0.30) (0.12) R14 RKF R11, R13, (0.95) (1.14) (0.37) (0.43) (0.30) (0.12) R14 RUF 30V RUF R10, R13, (0.29) (0.48) (0.17) (0.23) (0.30) (0.12) (0.035) (0.03) R14 RUF R10, R13, (0.29) (0.56) (0.17) (0.23) (0.30) (0.12) (0.035) (0.03) R14 RUF R10, R13, (0.35) (0.53) (0.17) (0.23) (0.30) (0.12) (0.035) (0.04) R14 RUF R10, R13, (0.35) (0.60) (0.17) (0.23) (0.30) (0.12) (0.035) (0.04) R14 RUF R10, R13, (0.40) (0.62) (0.17) (0.23) (0.30) (0.12) (0.035) (0.04) R14 RUF R10, R13, (0.45) (0.72) (0.17) (0.23) (0.30) (0.12) (0.035) (0.05) R14 RUF R11, R13, (0.45) (0.65) (0.17) (0.23) (0.30) (0.12) (0.047) (0.06) R14 RUF R11, R13, (0.55) (0.76) (0.17) (0.23) (0.30) (0.12) (0.047) (0.07) R14 RUF R11, R13, (0.55) (0.95) (0.37) (0.43) (0.30) (0.12) (0.047) (0.04) R14 RUF R11, R13, (0.65) (0.95) (0.37) (0.43) (0.30) (0.12) (0.047) (0.04) R14 RUF R11, R13, (0.75) (1.02) (0.37) (0.43) (0.30) (0.12) (0.047) (0.05) R14 RUF R11, R13, (0.85) (1.12) (0.37) (0.43) (0.30) (0.12) (0.047) (0.06) R14 RUF R11, R13, (0.95) (1.14) (0.37) (0.43) (0.30) (0.12) (0.047) (0.06) R14 RoHS Compliant, LV Compliant HF Halogen Free Specifications subject to change without notice Littelfuse, Inc.

18 Table R4 Dimensions and Weights Dimensions in Millimeters (Inches) Part C D F H J Number Min Max Min Max Min Max Min Max Min Max Typ Typ Typ RHF 30V - High Temperature Figure Device Mass (g) (Only for Reference) RHF R8, R13, (0.29) (0.50) (0.17) (0.23) (0.30) (0.12) (0.05) R14 RHF R10, R13, (0.27) (0.43) (0.17) (0.23) (0.30) (0.12) (0.05) (0.049) (0.05) R14 RHF R8, R13, (0.38) (0.54) (0.17) (0.23) (0.30) (0.12) R14 RUSF 16V RUSF R10, R13, (0.29) (0.48) (0.17) (0.23) (0.30) (0.12) (0.035) (0.03) R14 RUSF R10, R13, (0.29) (0.56) (0.17) (0.23) (0.30) (0.12) (0.035) (0.03) R14 RUSF R10, R13, (0.35) (0.53) (0.17) (0.23) (0.30) (0.12) (0.035) (0.04) R14 RUSF R10, R13, (0.35) (0.60) (0.17) (0.23) (0.30) (0.12) (0.035) (0.04) R14 RUSF R10, R13, (0.40) (0.62) (0.17) (0.23) (0.30) (0.12) (0.035) (0.04) R14 RUSF R10, R13, (0.45) (0.72) (0.17) (0.23) (0.30) (0.12) (0.035) (0.05) R14 RGF 16V RGF R10, R13, (0.35) (0.50) (0.17) (0.23) (0.13) (0.24) (0.12) (0.05) (0.049) (0.05) R14 RGF R11, R13, (0.24) (0.28) (0.24) (0.43) (0.17) (0.23) (0.30) (0.08) (0.12) (0.05) (0.049) (0.05) R14 RGF R11, R13, (0.31) (0.35) (0.31) (0.50) (0.17) (0.23) (0.30) (0.08) (0.12) (0.05) (0.049) (0.06) R14 RGF R11, R13, (0.37) (0.41) (0.37) (0.56) (0.17) (0.23) (0.30) (0.08) (0.12) (0.05) (0.049) (0.06) R14 RGF R11, R13, (0.38) (0.42) (0.48) (0.67) (0.17) (0.23) (0.30) (0.08) (0.12) (0.05) (0.049) (0.06) R14 RGF R11, R13, (0.40) (0.44) (0.58) (0.78) (0.17) (0.23) (0.30) (0.08) (0.12) (0.05) (0.049) (0.07) R14 RGF R11, R13, (0.46) (0.50) (0.63) (0.82) (0.17) (0.23) (0.30) (0.08) (0.12) (0.05) (0.049) (0.07) R14 RGF R11, R13, (0.51) (0.55) (0.66) (0.85) (0.17) (0.23) (0.30) (0.08) (0.12) (0.05) (0.049) (0.08) R14 RGF R11, R13, (0.65) (0.83) (0.99) (0.17) (0.23) (0.30) (0.08) (0.12) (0.05) (0.049) (0.08) R14 RGF R11, R13, (0.65) (0.69) (0.83) (1.02) (0.17) (0.23) (0.30) (0.08) (0.12) (0.05) (0.049) (0.09) R14 RGF R11, R13, (0.65) (0.69) (0.89) (1.10) (0.37) (0.43) (0.30) (0.09) (0.14) (0.06) (0.057) (0.06) R14 RGF R11, R13, (0.925) (0.89) (1.10) (0.37) (0.43) (0.30) (0.09) (0.14) (0.06) (0.057) (0.08) R14 RHF 16V - High Temperature RHF R8, R13, (0.37) (0.57) (0.17) (0.23) (0.30) (0.12) R14 RHF R12, R13, (0.35) (0.55) (0.17) (0.23) (0.30) (0.12) (0.05) R14 RHF R12, R13, (0.39) (0.59) (0.17) (0.23) (0.30) (0.12) (0.05) (0.049) (0.06) R14 Specifications subject to change without notice Littelfuse, Inc. HF Halogen Free RoHS Compliant, LV Compliant

19 Table R4 Dimensions and Weights Dimensions in Millimeters (Inches) Part C D F H J Number Min Max Min Max Min Max Min Max Min Max Typ Typ Typ RHF 16V - High Temperature Figure Device Mass (g) (Only for Reference) RHF R12, R13, (0.41) (0.61) (0.17) (0.23) (0.30) (0.12) (0.05) (0.049) (0.06) R14 RHF R12, R13, (0.44) (0.74) (0.17) (0.23) (0.30) (0.12) (0.05) R14 RHF R12, R13, (0.44) (0.83) (0.17) (0.23) (0.30) (0.12) (0.05) (0.049) (0.067) R14 RHF R12, R13, (0.50) (0.88) (0.17) (0.23) (0.30) (0.12) (0.05) (0.049) (0.07) R14 RHF R12, R13, (0.55) (0.86) (0.17) (0.23) (0.30) (0.12) (0.05) R14 RHF R12, R13, (0.55) (0.93) (0.17) (0.23) (0.30) (0.12) (0.05) (0.049) (0.08) R14 RHF R12, R13, (0.65) (0.88) (0.17) (0.23) (0.30) (0.12) (0.05) R14 RHF R12, R13, (0.65) (1.01) (0.17) (0.23) (0.30) (0.12) (0.05) R14 RHF R12, R13, (0.69) (1.04) (0.37) (0.43) (0.30) (0.12) (0.05) (0.049) (0.06) R14 RHF R12, R13, (0.83) (1.03) (0.37) (0.43) (0.30) (0.12) (0.05) R14 RHF R12, R13, (0.925) (1.13) (0.37) (0.43) (0.30) (0.14) (0.06) (0.057) (0.084) R14 RHF R12, R13, (0.925) (1.13) (0.37) (0.43) (0.30) (0.14) (0.06) R14 RHF R12, R13, (0.925) (1.13) (0.37) (0.43) (0.30) (0.14) (0.06) (0.057) (0.084) R14 RUSF 6V RUSF R8, R13, (0.27) (0.45) (0.17) (0.23) (0.30) (0.12) (0.036) (0.04) R14 RUSF R8, R13, (0.27) (0.46) (0.17) (0.23) (0.30) (0.12) (0.036) (0.04) R14 RUSF R8, R13, (0.27) (0.46) (0.17) (0.23) (0.30) (0.12) (0.036) (0.04) R14 RoHS Compliant, LV Compliant HF Halogen Free Specifications subject to change without notice Littelfuse, Inc.

20 Figures R15-R20 Typical Time-to-Trip Curves at 20 C RXF = RXF005 = RXF010 C = RXF017 D = RXF020 = RXF025 F = RXF030 G = RXF040 H = RXF050 I = RXF065 J = RXF075 K = RXF090 L = RXF110 M = RXF135 N = RXF160 O = RXF185 P = RXF250 Q = RXF300 R = RXF375 Figure R15 Time-to-Trip (s) C D F G H I J K L MNO P QR R 1 Q P 0.1 O N M L 0.01 K J I H C D F G 100 Fault Current () RKF = RKF050 = RKF065 C = RKF075 D = RKF090 = RKF110 F = RKF135 G = RKF160 H = RKF185 I = RKF250 J = RKF300 K = RKF375 L = RKF400 M = RKF500 Figure R16 Time-to-Trip (s) D C G F H I J L K M M L K J I 0.1 H G F CD 100 Fault Current () RUF = RUF090 = RUF110 C = RUF135 D = RUF160 = RUF185 F = RUF250 G = RUF300 H = RUF400 I = RUF500 J = RUF600 K = RUF700 L = RUF800 M = RUF900 Figure R17 Time-to-Trip (s) C D F G H I J K L M M L K J I H G F D C 100 Fault Current () Specifications subject to change without notice Littelfuse, Inc. HF Halogen Free RoHS Compliant, LV Compliant

21 Figures R15-R20 Typical Time-to-Trip Curves at 20 C RGF (data at 25 C) = RGF250 = RGF300 C = RGF400 D = RGF500 = RGF600 F = RGF700 G = RGF800 H = RGF900 I = RGF1000 J = RGF1100 K = RGF1200 L = RGF1400 Figure R18 Time-to-Trip (s) C D FGH I J K L L K J G HI F D C Fault Current () RHF (data at 25 C) = RHF050 = RHF070 C = RHF100 D = RHF200 = RHF300 F = RHF400 G = RHF450 H = RHF550 I = RHF600 J = RHF650 K = L = RHF700 RHF750 M = RHF800 N = RHF900 O = RHF1000 P = RHF1100 Q = RHF1300 R = RHF1400 S = RHF1500 Figure R19 Time-to-Trip (s) C D F G H IJKLMNOP QRS S P Q R O N M K L J I H 0.01 G F 1 10 C D 100 Fault Current () RUSF = RUSF075 = RUSF090 C = RUSF110 D = RUSF120 = RUSF135 F = RUSF155 G = RUSF160 H = RUSF185 I = RUSF250 Figure R20 Time-to-Trip (s) C D F G H I I H G F 0.01 D C Fault Current () RoHS Compliant, LV Compliant HF Halogen Free Specifications subject to change without notice Littelfuse, Inc.

22 Table R5 Physical Characteristics and nvironmental Specifications RXF Physical Characteristics Lead Material RXF005 : Tin-plated Nickel-copper lloy, 0.128mm 2 (26WG), ø0.40mm (0.016in) RXF010 : Tin-plated Nickel-copper lloy, 0.205mm 2 (24WG), ø0.51mm (0.020in) RXF017 to 040 : Tin-plated Copper-clad Steel, 0.205mm 2 (24WG), ø0.51mm (0.020in) RXF050 to 090 : Tin-plated Copper, 0.205mm 2 (24WG), ø0.51mm (0.020in) RXF110 to 375 : Tin-plated Copper, 0.52mm 2 (20WG), ø0.81mm (0.032in) Soldering Characteristics Solderability per NSI/J-STD-002 Category 3 RXF005, RXF010 Meet NSI/J-STD-002 Category 1 Solder Heat Withstand RXF005- RXF025: per IC-STD , Test Tb, Method 1a, Condition a; Can Withstand 5s at 260 C ±5 C ll Other Sizes : per IC-STD , Test Tb, Method 1a, Condition b; Can Withstand 10s at 260 C ±5 C Insulating Material Cured, Flame-retardant poxy Polymer; Meets UL 94V-0 Operation Temperature -40 C~85 C Note: Devices are not designed to be placed through a reflow process. nvironmental Specifications Test Conditions Resistance Change Passive ging -40 C, 1000 hrs ±5% 85 C, 1000 hrs ±5% Humidity ging 85 C, 85%RH, 1000 hrs ±10% Thermal Shock 85 C, -40 C (10 Times) ±10% Solvent Resistance MIL-STD-202, Method 215F No Change RKF Physical Characteristics Lead Material RKF050 to 090 : Tin-plated Copper, 0.205mm 2 (24WG), ø0.51mm (0.020in) RKF110 to 500 : Tin-plated Copper, 0.52mm 2 (20WG), ø0.81mm (0.032in) Soldering Characteristics Solderability per NSI/J-STD-002 Category 3 Solder Heat Withstand RKF050-RKF185: per IC-STD , Test Tb, Method 1a, Condition a; Can Withstand 5s at 260 C ±5 C ll Other Sizes : per IC-STD , Test Tb, Method 1a, Condition b; RKF Can Withstand 10s at 260 C ±5 C Insulating Material Cured, Flame-retardant poxy Polymer; Meets UL 94V-0 Operation Temperature -40 C~85 C Note: Devices are not designed to be placed through a reflow process. nvironmental Specifications Test Conditions Resistance Change Passive ging -40 C, 1000 hrs ±5% 85 C, 1000 hrs ±5% Humidity ging 85 C, 85%RH, 1000 hrs ±10% Thermal Shock 85 C, -40 C (10 Times) ±10% Solvent Resistance MIL-STD-202, Method 215F No Change Specifications subject to change without notice Littelfuse, Inc. HF Halogen Free RoHS Compliant, LV Compliant

23 Table R5 Physical Characteristics and nvironmental Specifications RUF Physical Characteristics Lead Material RUF090 to RUF250: Tin-plated Copper-clad Steel, 0.205mm 2 (24WG) RUF300 to RUF900: Tin-plated Copper, 0.52mm 2 (20WG), ø0.81mm (0.032in) Soldering Characteristics Solderability per NSI/J-STD-002 Category 3 Solder Heat Withstand per IC-STD , Test Tb, Method1, Condition, Can Withstand 10s at 260 C ±5 C Insulating Material Cured, Flame-retardant poxy Polymer; Meets UL 94V-0 Operation Temperature -40 C~85 C Note: Devices are not designed to be placed through a reflow process. nvironmental Specifications Test Conditions Resistance Change Passive ging 70 C, 1000 hrs ±5% 85 C, 1000 hrs ±5% Humidity ging 85 C, 85%RH, 1000 hrs ±5% Thermal Shock 85 C, -40 C (10 times) ±5% Solvent Resistance MIL-STD-202, Method 215F No Change RUSF Physical Characteristics Lead Material RUSF075 : Tin-plated Nickel-copper lloy, 0.205mm 2 (24WG), ø0.51mm/0.020in RUSF090 to RUSF250: Tin-plated Copper-clad Steel, 0.205mm 2 (24WG), ø0.51mm/0.020in Soldering Characteristics Solderability per NSI/J-STD-002 Category 3 xcept RUSF075 Meet NSI/J-STD-002 Category 1 Solder Heat Withstand RUSF120: per IC-STD , Test Tb, Method 1, Condition ; Can Withstand 5s at 260 C ±5 C ll Others : per IC-STD , Test Tb, Method 1, Condition ; Can Withstand 10s at 260 C ±5 C Insulating Material Cured, Flame-retardant poxy Polymer; Meets UL 94V-0 Operation Temperature -40 C~85 C Note: Devices are not designed to be placed through a reflow process. nvironmental Specifications Test Conditions Resistance Change Passive ging 70 C, 1000 hrs ±5% 85 C, 1000 hrs ±5% Humidity ging 85 C, 85%RH, 1000 hrs ±5% Thermal Shock 85 C, -40 C (10 Times) ±5% Solvent Resistance MIL-STD-202, Method 215F No change RoHS Compliant, LV Compliant HF Halogen Free Specifications subject to change without notice Littelfuse, Inc.