0435003.KR

**Surface Mount Fuses** 

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

## **435 Series 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. 

## ~~**Features** Po~~ 

## ~~**Agency Approvals** [Po~~ 

- 35A interrupt rating at • Maximum protection 32VDC of sensitive circuits 

- • Small size with current as fuses are designed to open consistently 

- ratings of 0.25 to 5.0 in <5sec at 200% 

- amperes overload. 

Agency Agency File number Ampere rAnge Wi e10480 0.250 - 5.0A lr 29862 0.250 - 5.0A 

- RoHS compliant, lead• Enhanced Breaking 

- free and halogen-free Capacity, High l[2] t 

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lr 29862 0.250 - 5.0A<br>G<br>Electrical Characteristics for Series<br>Applications<br>ee ees<br>**----- End of picture text -----**<br>


|% of Ampere<br>rating<br>~~ee~~|Ampere<br>rating<br>~~ee~~|Opening Time at 25Oc<br>~~ee ~~|
|---|---|---|
|100%|0.250A - 5A|4 hours, Minimum|
|200%|0.375A - 5A|5 secs., Maximum|
|300%|0.250A|5 secs., Maximum|
|300%|0.375A - 5A|0.2 sec., Maximum|



Secondary protection for space constrained applications such as: 

- Cell phones 

   - DVD players 

- Battery packs • Hard disk drives. 

• Digital cameras 

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

|Ampere<br>rating<br>(A)<br>~~pd~~<br>~~a~~|Amp<br>code<br>~~pd~~<br>~~|~~<br>~~a~~|max<br>Voltage<br>rating<br>(V)<br>~~|~~|interrupting<br>rating|nominal cold<br>resistance<br>(Ohms)|nominal<br>melting<br>i2t (A2sec)<br>~~a~~|nom<br>Voltage<br>Drop<br> (mV)<br>~~ee ee~~|nom<br>power<br>Dissipation<br> (W)<br>~~|~~<br>~~ee~~|AgencyApprovals<br>~~|~~<br>~~sd~~|AgencyApprovals<br>~~|~~<br>~~sd~~|
|---|---|---|---|---|---|---|---|---|---|
|||||||||~~|~~<br>~~ee~~|~~sd~~|
|0.250<br>~~pd~~<br>~~a~~|.250<br>~~pd~~<br>~~|~~<br>~~a~~|32<br>~~|~~|35A @32V DC|0.2265<br>~~ee~~|0.0025<br>~~a~~<br>~~ee~~|60.67<br>~~ee ee~~<br>~~ee~~|0.01517<br>~~ee~~<br>~~ee~~|x<br>~~ee~~<br>~~ee~~|x<br>~~ee~~|
|0.375<br>~~pd~~<br>~~a~~<br>~~|~~|.375<br>~~pd~~<br>~~|~~<br>~~a~~<br>~~||~~|32<br>~~|~~<br>~~|~~||0.1930<br>~~ee~~<br>~~ee~~|0.0035<br>~~a~~<br>~~ee~~<br>~~ee~~|84.64<br>~~ee ee~~<br>~~ee~~<br>~~ee~~|0.03174<br>~~ee~~<br>~~ee~~<br>~~ee~~|x<br>~~ee~~<br>~~ee~~<br>~~ee~~|x<br>~~ee~~|
|0.500<br>~~a~~<br>~~|~~<br>~~a~~|.500<br>~~|~~<br>~~a~~<br>~~||~~<br>~~a~~|32<br>~~|~~<br>~~|~~||0.1600<br>~~ee~~<br>~~ee~~<br>~~ee~~|0.0053<br>~~a~~<br>~~ee ~~<br>~~ee~~<br>~~ee~~|93.35<br>~~ee ee~~<br> ~~ee~~<br>~~ee~~<br>~~es~~|0.04668<br>~~ee ~~<br>~~ee~~<br>~~ee~~|x<br> ~~ee~~<br>~~ee~~<br>~~ee~~|x<br>~~ee~~|
|0.750<br>~~|~~<br>~~a~~<br>~~|~~|.750<br>~~||~~<br>~~a~~<br>~~||~~|32<br>~~|~~<br>~~|~~||0.1050<br>~~ee~~<br>~~ee~~<br>~~ee~~|0.0120<br>~~ee~~<br>~~ee~~<br>~~ee~~|101.84<br>~~ee~~<br>~~es~~<br>~~ee~~|0.07638<br>~~ee~~<br>~~ee~~|x<br>~~ee~~<br>~~ee~~|x|
|1.00<br>~~|~~<br>~~a~~<br>~~|~~<br>~~a~~|001.<br>~~| |~~<br>~~a~~<br>~~||~~<br>~~a~~|32<br>~~|~~<br>~~|~~||0.0730<br>~~ee~~<br>~~ee ~~<br>~~ee~~<br>~~ee~~|0.0200<br>~~ee ~~<br> ~~ee~~<br>~~ee~~<br>~~ee~~|87.45<br> ~~ee ~~<br>~~es~~<br>~~ee~~<br>~~es~~|0.08745<br> ~~ee ~~<br>~~ee~~|x<br> ~~ee~~<br>~~ee~~|x|
|1.25<br>~~|~~<br>~~a~~<br>~~|~~|1.25<br>~~||~~<br>~~a~~<br>~~||~~|32<br>~~|~~<br>~~|~~||0.0600<br>~~ee~~<br>~~ee~~<br>~~ee~~|0.0350<br>~~ee~~<br>~~ee~~<br>~~ee~~|96.37<br>~~ee~~<br>~~es~~<br>~~ee~~|0.12046<br>~~ee~~<br>~~ee~~|x<br>~~ee~~<br>~~ee~~|x|
|1.50<br>~~|~~<br>~~a~~<br>~~|~~<br>~~a~~|01.5<br>~~| |~~<br>~~a~~<br>~~||~~<br>~~a~~|32<br>~~|~~<br>~~|~~||0.0470<br>~~ee~~<br>~~ee ~~<br>~~ee~~<br>~~ee~~|0.0560<br>~~ee ~~<br> ~~ee~~<br>~~ee~~<br>~~ee~~|86.70<br> ~~ee ~~<br>~~es~~<br>~~ee~~<br>~~es~~|0.13005<br> ~~ee ~~<br>~~ee~~|x<br> ~~ee~~<br>~~ee~~|x|
|1.75<br>~~|~~<br>~~a~~<br>~~a~~|1.75<br>~~||~~<br>~~a~~<br>~~a~~|32<br>~~|~~||0.0390<br>~~ee~~<br>~~ee~~<br>~~ee~~|0.0750<br>~~ee~~<br>~~ee~~<br>~~ee~~|81.13<br>~~ee~~<br>~~es~~<br>~~ee~~|0.14198<br>~~ee~~<br>~~ee~~|x<br>~~ee~~<br>~~ee~~|x|
|2.00<br>~~|~~<br>~~a~~<br>~~a~~<br>~~a~~|002.<br>~~| |~~<br>~~a~~<br>~~a~~<br>~~a~~|32<br>~~|~~||0.0300<br>~~ee~~<br>~~ee ~~<br>~~ee~~<br>~~ee~~|0.1000<br>~~ee ~~<br> ~~ee~~<br>~~ee~~<br>~~ee ee~~|70.62<br> ~~ee ~~<br>~~es~~<br>~~ee~~<br>~~ee~~|0.14120<br> ~~ee ~~<br>~~ee~~<br>~~ee~~|x<br> ~~ee~~<br>~~ee~~|x|
|2.50<br>~~a~~<br>~~a~~<br>~~a~~|02.5<br>~~a~~<br>~~a~~<br>~~a~~|32||0.0185<br>~~ee~~<br>~~ee~~<br>~~ee~~|0.1560<br>~~ee~~<br>~~ee ee~~<br>~~ee~~|55.25<br>~~ee~~<br>~~ee~~<br>~~ee~~|0.13813<br>~~ee ~~<br>~~ee~~<br>~~ee~~|x<br> ~~ee~~<br>~~ee~~|x|
|3.00<br>~~a~~<br>~~a~~<br>~~a~~|003.<br>~~a~~<br>~~a~~<br>~~a~~|32||0.0165<br>~~ee ~~<br>~~ee~~<br>~~ee~~|0.2032<br> ~~ee ee~~<br>~~ee~~<br>~~ee~~|60.58<br>~~ee ~~<br>~~ee~~<br>~~ee ee~~|0.18740<br> ~~ee~~<br>~~ee~~<br>~~ee~~|x<br>~~ee~~|x|
|3.50<br>~~a~~<br>~~a~~<br>~~ee~~|03.5<br>~~a~~<br>~~a~~<br>~~ee~~|32||0.0135<br>~~ee~~<br>~~ee~~<br>~~——~~|0.3017<br>~~ee~~<br>~~ee~~<br>~~ee~~|57.84<br>~~ee~~<br>~~ee ee~~<br>~~**e**e~~|0.20244<br>~~ee ~~<br>~~ee~~<br>~~ee~~|x<br> ~~ee~~<br>~~ee~~|x|
|4.00<br>~~a~~<br>~~ee~~|004.<br>~~a~~<br>~~ee~~|32||0.0115<br>~~ee~~<br>~~——~~|0.3084<br>~~ee ~~<br>~~ee~~<br>~~ee~~|57.00<br> ~~ee ee~~<br>~~**e**e~~|0.22800<br>~~ee~~<br>~~ee~~<br>~~e~~|x<br>~~ee~~|x|
|5.00<br>~~ee~~|005.<br>~~ee~~|32||0.0085<br>~~——~~|0.5310<br>~~ee~~<br>~~ee~~|52.44<br>~~**e**e~~|0.26220<br>~~ee~~<br>~~e~~|x<br>~~ee~~|x|



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

2. Measured at rated voltage. 

© 2009 Littelfuse, Inc. 

**435 Series** 

**45** Revised: Jun 16, 2011 

Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/435.html for current information. 

**Introduction to Circuit ProtectionSurface Mount Fuses** Thin Film > 0402 Size > Very Fast-Acting > 435 SeriesTransientology 

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## ~~**Temperature Rerating Curve**~~ 

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Note: 

1. Derating 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. 

## ~~**Soldering Parameters**~~ 

|refow condition|refow condition|refow condition|Pb – Free assembly|
|---|---|---|---|
|pre Heat|- Temperature min (Ts(min))||150°C|
||- Temperature max (Ts(max))||200°C|
||- Time (min to max) (ts)||60 – 120 secs|
|Average ramp up rate (liquidus Temp<br>(Tl) to peak|||5°C/second max|
|TS(max)to Tl- ramp-up rate|||5°C/second max|
|refow|- Temperature (Tl) (liquidus)||217°C|
||- Temperature (tl)||60 – 150 seconds|
|peak Temperature (Tp)|||250+0/-5°C|
|Time within 5°c of actual peak<br>Temperature (tp)|||20 – 40 seconds|
|ramp-down rate|||5°C/second max|
|Time 25°c to peak Temperature (Tp)|||8 minutes Max.|
|Do not exceed|||260°C|
|||||
|Wave Soldering||260°C, 10 seconds max.||



## ~~**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>t P<br>T P<br>Critical Zone<br>Ramp-up TL to TP<br>T S(max) T L t L<br>Ramp-down<br>Preheat<br>T S(min)<br>t S<br>25<br>time to peak temperature Time<br>(t 25ºC to peak)<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>Temperature<br>**----- End of picture text -----**<br>


© 2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/435.html for current information. 

**435 Series** 

**46** 

**Surface Mount Fuses** Thin Film >  0402 Size > Very Fast-Acting > 435 Series 

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## ~~**Product Characteristics**~~ 

**Body:** Epoxy / Glass Substrate; Parts with ‘HF’ suffix: Halogen Free Epoxy / Glass **Materials Terminations:** 100% Tin over Nickel over Copper **Device Weight:** 0.316mg **Terminal** MIL-STD-202F, Method 211A, Test Condition A **Strength Insulation** After Opening: Greater than 10,000Ohms **Resistance** 

–55°C to 90°C. **Operating** Consult temperature rerating curve chart. **Temperature** For operation above 90°C please contact Littelfuse. **Thermal Shock** Withstands 5 cycles of –55°C to 125°C **Vibration** MIL-STD-202F 

## ~~**Dimensions**~~ 

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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>**----- End of picture text -----**<br>


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

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Amp  Marking<br>Code Code<br>.250 X<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>**----- End of picture text -----**<br>


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

||**A**|**B**|**C**|**D**|
|---|---|---|---|---|
|inch min|0.037|0.018|0.008|0.005|
|inch max|0.041|0.022|0.016|0.012|
|mm min|0.94|0.457|0.190|0.127|
|mm max|1.04|0.559|0.394|0.305|



## **0435 002. K R HF  S** 

**SERIES AMP Code** 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 0435 **01.5** KRHF (2 amp product shown) **QuANTITy Code** K = 10,000 Pieces **PACKAgINg Code** R = Tape and Reel **HAlOgEN FREE ITEM “S” - for .250A only** 

## ~~**Packaging**~~ 

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Quantity &<br>packaging Option packaging Specification Quantity<br> packaging code<br>8mm Tape and Reel EIA-481 Rev. D (IEC 60286, part 3) 10000 KR<br>**----- End of picture text -----**<br>


© 2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/435.html for current information. 

**435 Series** 

**47**