0435.250KRS

Thin Film > 0402 Size > Very Fast-Acting > 435 Series 

~~**RoHS**~~ **Pb** ~~|[JOHFAAG.]~~ 

## **Surface Mount Fuses** 

## 435 Series 0402 Fast-Acting Fuse 

## ~~**Description**~~ 

The 435 Series are fast-acting surface mount thin-film fuses. Their ultra-small size (0402 size) makes them ideal for secondary protection of circuits used in space constrained applications such as hand-held portable electronic devices. 

This series is 100% lead-free and meet the requirements of the RoHS directive. New Halogen-Free 435 Series fuses are available–to order use the “HF” suffix. See Part Numbering section for additional information. 

|~~**Agency Approvals**~~<br>**Agency**<br>**Agency File Number**<br>**Ampere Range**<br>E10480<br>0.250A - 5.0A<br>29862<br>0.250A - 5.0A<br>~~**Electrical Characteristics for Series**~~<br>~~EO ~~<br>~~ee~~<br>@,~~Lo~~||~~**Features**~~<br>• 50A interrupt rating at<br>32VDC<br>• Small size with current<br>ratings of 0.25 to 5.0<br>amperes<br>• RoHS compliant, Lead-<br>Free and Halogen-Free<br>• Maximum protection of<br>sensitive circuits as fuses<br>are designed to open<br>consistently in <5sec at<br>200% overload.<br>•  Recognized to UL/CSA/<br>NMX 248-1 and UL/CSA/<br> ~~Eee~~|~~**Features**~~<br>• 50A interrupt rating at<br>32VDC<br>• Small size with current<br>ratings of 0.25 to 5.0<br>amperes<br>• RoHS compliant, Lead-<br>Free and Halogen-Free<br>• Maximum protection of<br>sensitive circuits as fuses<br>are designed to open<br>consistently in <5sec at<br>200% overload.<br>•  Recognized to UL/CSA/<br>NMX 248-1 and UL/CSA/<br> ~~Eee~~|
|---|---|---|---|
|**% of Ampere Rating**<br>**Ampere Rating**<br>**Opening Time at 25OC**<br>100%<br>0.250A - 5A<br>4 hours, Minimum||• Enhanced Breaking<br>Capacity, High l2t|NMX 248-14|
|200%<br>0.375A - 5A<br>5 secs., Maximum||||
|300%<br>0.250A<br>5 secs., Maximum||||
|300%<br>0.375A - 5A<br>0.2 sec., Maximum||||



## **Additional Information** 

## ~~**Applications** Lo~~ 

Secondary protection for space constrained applications such as: 

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- Cell phones 

- Battery packs 

- DVD players 

• Hard disk drives. 

• Digital cameras 

## ~~**Electrical Specifcations by Item** Lo~~ 

|**Ampere**<br>**Rating**<br>**(A)**<br>0.250<br>0.375<br>0.500<br>0.750<br>1.00<br>1.25<br>1.50<br>1.75<br>2.00<br>2.50<br>3.00<br>3.50<br>4.00<br>5.00|**Amp Code**<br>.250<br>.375<br>.500<br>.750<br>001.<br>1.25<br>01.5<br>1.75<br>002.<br>02.5<br>003.<br>03.5<br>004.<br>005.<br>~~re~~|**Max Voltage**<br>**Rating**<br>**(V)**<br>32<br>32<br>32<br>32<br>32<br>32<br>32<br>32<br>32<br>32<br>32<br>32<br>32<br>32<br>~~|~~|**Interrupting**<br>**Rating**<br>**Nominal Cold**<br>**Resistance**<br>**(Ohms)**<br>**Nominal**<br>**Melting**<br>**I2t (A2sec)**<br>**Nom**<br>**Voltage Drop**<br>**(mV)**<br>**Nom Power**<br>**Dissipation**<br>**(W)**<br>**Agency Approvals**<br>50A @32VDC2<br>0.36001<br>0.0025<br>92.49<br>0.0231<br>x<br>x<br>0.19301<br>0.0035<br>84.64<br>0.03174<br>x<br>x<br>0.16001<br>0.0053<br>93.35<br>0.04668<br>x<br>x<br>0.10501<br>0.0120<br>101.84<br>0.07638<br>x<br>x<br>0.07301<br>0.0200<br>87.45<br>0.08745<br>x<br>x<br>0.06001<br>0.0350<br>96.37<br>0.12046<br>x<br>x<br>0.04701<br>0.0560<br>86.70<br>0.13005<br>x<br>x<br>0.03901<br>0.0750<br>81.13<br>0.14198<br>x<br>x<br>0.03001<br>0.1000<br>70.62<br>0.14120<br>x<br>x<br>0.02001<br>0.1560<br>55.25<br>0.13813<br>x<br>x<br>0.01701<br>0.2032<br>60.58<br>0.18740<br>x<br>x<br>0.01501<br>0.3017<br>57.84<br>0.20244<br>x<br>x<br>0.01051<br>0.3084<br>57.00<br>0.22800<br>x<br>x<br>0.00851<br>0.5310<br>52.44<br>0.26220<br>x<br>x<br>~~|AG.~~<br>~~po~~<br>~~po~~<br>~~po~~<br>~~po~~<br>~~po~~<br>~~po~~<br>~~po~~<br>~~po~~<br>~~po~~<br>~~po~~<br>~~po~~<br>~~po~~<br>~~Sen~~|
|---|---|---|---|



**1.** Measured at 10% of rated current, 25ºC. 

**2.** Measured at rated voltage. 

© 2020 Littelfuse, Inc. Specifications are subject to change without notice.  Application teSpecification **s** are subject to change without notice.ting is strongly recommended. Revised: BO. 11/13/20 

Thin Film > 0402 Size > Very Fast-Acting > 435 Series 

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## **Surface Mount Fuses** 

## ~~**Temperature Re-rating Curve**~~ 

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## **Notes:** 

**1.** Rerating depicted in this curve is in addition to the standard derating of 25% for continuous operation. 

## **Example:** 

- For continuous operation at 70 degrees celsius, the fuse should be deratedas follows: 

- I = (0.75)(0.80)IRAT = (0.60)IRAT 

**2.** The temperature derating curve represents the nominal conditions. For questions about temperature derating curve, please consult Littelfuse technical support for assistance. 

## ~~**Average Time Current Curves**~~ 

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100<br>10<br>1<br>0.1<br>0.01<br>0.001<br>0.1  1.0  10.0  100.0<br>CURRENT IN AMPERES<br>.25A  .375A  .5A  .75A  1A  1.25A  1.5A  1.75A  2A  2.5A  3A  3.5A  4A  5A<br>TIME IN SECONDS<br>**----- End of picture text -----**<br>


||~~**Soldering Parameters**~~|||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
||**Refow Condition**<br>**Pre Heat**<br>**- Temperature Min (Ts(min))**<br>**- Temperature Max (Ts(max))**<br>**- Time (Min to Max) (ts)**<br>**Average ramp up rate (Liquidus Temp (TL) topeak**<br>**TS(max) to TL - Ramp-up Rate**<br>**Refow**<br>**- Temperature (TL) (Liquidus)**<br>**- Temperature (tL)**<br>**Peak Temperature (TP)**<br>**Time within 5°C of actualpeak Temperature (tp)**<br>**Ramp-down Rate**|Pb – Free assembly<br>150°C<br>200°C<br>60 – 120 secs<br>5°C/second max<br>5°C/second max<br>217°C<br>60 – 150 seconds<br>250+0/-5°C<br>20 – 40 seconds<br>5°C/second max||**Temperature**|**T**P<br>**T**L<br>**T**S(max)<br>**T**S(min)||**t**S<br>**Preheat**|||**Ramp-up**|||**t**P<br>**t**L||**Ramp-down**<br>**Critical Zone**<br>**TL to TP**|||||
||**Time 25°C topeak Temperature (TP)**<br>**Do not exceed**|8 minutes Max.<br>260°C|||**25**|**time to peak temperature**<br>**(t 25ºC to peak)**||||||||**Time**||||||
|||||||||||||||||||||
||**Wave Soldering**<br>260°C, 10 seconds|max.||||||||||||||||||



© 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: BO. 11/13/20 

Thin Film > 0402 Size > Very Fast-Acting > 435 Series 

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## **Surface Mount Fuses** 

||~~**Product Characteristics**~~|~~**Product Characteristics**~~|||||
|---|---|---|---|---|---|---|
||||||||
||**Materials**|**Body:**Epoxy / Glass Substrate;<br>Parts with ‘HF’ suffx: Halogen Free Epoxy / Glass<br>**Terminations:**100% Tin over Nickel over Copper||**Operating**<br>**Temperature**|–55°C to 90°C.<br>Consult temperature re-rating curve chart.<br>For operation above 90°Cplease contact Littelfuse.||
||**Terminal Strength**|**Device Weight:**0.316mg<br>MIL-STD-202, Method 211, Test Condition A||**Thermal Shock**|Withstands 5 cycles of –55°C to 125°C||
||**Insulation Resistance**|After Opening: Greater than 10,000Ohms||**Vibration**|MIL-STD-202, Method 201||



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A Marking code varies with amperage.<br>.991 +/- .051 Refer to Part Marking<br>(.039" +/- .002") System chart.<br>B .508 +/- .051<br>(.020" +/- .002")<br>.229 +/- .102<br>(.009" +/- .004")<br>0.330 +/- .102(.013" +/- .004") C 0.292 +/- .102(.012" +/- .004")<br>D .2159 +/- .0889<br>(.0085" +/- .0035") Reflow solder<br>recommended<br>Sn Cu mounting pad<br>dimensions<br>.584<br>(.023")<br>.381 1.55<br>(.015") (.061")<br>.558<br>(.022")<br>Unit A B C D<br>inch min 0.037 0.018 0.008 0.005<br>inch max 0.041 0.022 0.016 0.012<br>mm min 0.94 0.457 0.190 0.127<br>mm max 1.04 0.559 0.394 0.305<br>Packaging<br>Packaging   Packaging  Quantity & Packaging<br>Option Specification Quantity Code<br>8mm Tape   EIA-481 Rev. D   10000 KR<br>and Reel (IEC 60286, part 3)<br>**----- End of picture text -----**<br>


## ~~**Part Marking System**~~ 

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Amp Code Marking Code<br>0.250 X<br>0.375<br>0.500<br>0.750<br>001.<br>1.25<br>01.5<br>1.75<br>002.<br>02.5<br>003.<br>03.5<br>004.<br>005.<br>**----- End of picture text -----**<br>


## ~~**Part Numbering System**~~ 

**0435 002. K R  HF S Series** Refer to Amp Code column in the Electrical Specifications table. The dot is positioned at the end of the number sequence with whole ratings and within for fractional ratings. **Example:** 1.5 amp product is 043501.5KRHF (2 amp product shown) **Quantity Code** K = 10,000 Pieces **Packaging Code** R = Tape and Reel **Halogen Free Item “S” - for .250A only** 

**Disclaimer Notice -** Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at: www.littelfuse.com/disclaimer-electronics. 

© 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: BO. 11/13/20