0429007.WRMLHF

**Surface Mount Fuses** Thin Film > 1206 Size > Very Fast-Acting > 429 Series 

**RoHS** ~~**Pb**~~ 

## 429 Series 1206 Fast-Acting Fuse 

## ~~**Description**~~ 

The 429 Series Fast-Acting SMF is a small (1206 size) thinfilm device designed for secondary protection of circuits used in space constrained applications such as hand-held portable electronic devices. 

This series is Halogen-Free, Lead-Free and meets the requirements of the RoHS directive. 

## ~~**Features**~~ 

- RoHS compliant and • **For new designs up to** Lead-Free 7A device **5A please consult the** available-add ‘L’ suffix to **433 or 466 Series** part number. 

- Halogen-Free 7A device available-add ‘HF’ suffix to the part number 

## ~~**Agency Approvals**~~ 

|AGENCY|AGENCY FILE NUMBER|AMPERE RANGE|
|---|---|---|
||E10480|7A|
||29862|7A|



## ~~**Applications**~~ 

Secondary protection for space constrained applications such as: 

- Cell phones 

   - DVD players 

- Battery packs 

||29862<br>7A|29862<br>7A|29862<br>7A|29862<br>7A|• Cell phones<br>• Battery packs<br>Secondary protection for space constrained applications<br>such as:|Secondary protection for space constrained applications|Secondary protection for space constrained applications|• DVD players<br>Secondary protection for space constrained applications|• DVD players<br>Secondary protection for space constrained applications|• DVD players<br>Secondary protection for space constrained applications|• DVD players<br>Secondary protection for space constrained applications|
|---|---|---|---|---|---|---|---|---|---|---|---|
|~~**Electrical Characteristics for Series**~~|~~**Electrical Characteristics for Series**~~||||• Battery packs|||• Hard disk drives.||||
||||||• Digital cameras|||||||
|% of Ampere<br>Rating|||Opening Time at 25|Opening Time at 25OC||||||||
|100%|||4 hours, Minimum||**Additional Information**|||||||
|200%|||5 sec., Maximum|||||||||
|300%|||0.2 sec., Maximum|||||||||
||||||**Datasheet**|**Resources**||||**Samples**||
|~~**Electrical Specif**~~|~~**Electrical Specif**~~**i**~~**cations by Item**~~|||||||||||
|||||||||||||
|Ampere<br>Rating<br>(A)|Amp<br>Code||Max<br>Voltage Rating<br>(V)|Interrupting<br>Rating|Nominal Cold<br>Resistance (Ohms)||Nominal<br>Melting<br>I2t (A2sec)|||Agency<br>Approvals||
|7.00|007.||24|35A @24VAC/VDC|0.009|||4.900||x|x|



## ~~**Electrical Characteristics for Series**~~ 

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

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

2. Measured at rated voltage. 

© 2015 Littelfuse, Inc. Specifications are subject to change without notice.  Application testing is strongly recommendedSpecifications are subject to change without notice **.** Revised: 04/30/15 

**Surface Mount Fuses** Thin Film > 1206 Size > Very Fast-Acting > 429 Series 

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

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Note: 

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 10 100<br>CURRENT IN AMPERES<br>A<br>7<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<br>(TL) to peak|Pb – Free assembly<br>150°C<br>200°C<br>60 – 180 secs<br>5°C/second max|
|---|---|---|
||TS(max)to TL- Ramp-up Rate|5°C/second max|
||Refow<br>- Temperature (TL) (Liquidus)<br>- Temperature (tL)|217°C<br>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<br>260°C, 10 seconds max.||



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


© 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 04/30/15 

**Surface Mount Fuses** Thin Film > 1206 Size > Very Fast-Acting > 429 Series 

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||~~**Product Characteristics**~~|~~**Product Characteristics**~~|||||
|---|---|---|---|---|---|---|
||||||||
||**Materials**<br>**Operating**<br>**Temperature**|**Body:**Epoxy Substrate<br>**Terminations, RoHS Compliant Device (429L):**<br>100% Tin over Nickel over Copper<br>**Element Cover Coat:**Conformal Coating<br>NOTE: Do not use alcohol-based cleaners or<br>solvents with 429 Series Thin-Film Fuses as it<br>may damage the coating.<br>– 55OC to 90OC.<br>Consult temperature re-rating chart.<br>For operation above 90°C contact Littelfuse.||**Humidity**<br>**Vibration**<br>**Insulation Resistance**<br>**(After Opening)**<br>**Resistance to**<br>**Soldering Heat**|MIL-STD-202, Method 103<br>Condition D<br>Withstands 10 – 55 Hz per MIL-<br>STD-202, Method 201 and 10-2000<br>Hz at 20 g’s per MIL-STD-202, Method<br>204, Condition D.<br>Greater than 10,000 ohms<br>MIL-STD-202, Method 210,<br>Condition D||
||**Thermal Shock**|Withstands 5 cycles of – 55OC to 125OC|||||



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Part Marking System<br>Marking<br>Series<br>Code<br>429L  7<br>Part Numbering System<br>**----- End of picture text -----**<br>


## ~~**Dimensions**~~ 

## **RECOMMENDED PAD LAYOUTS** 

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3.175±0.127<br>(0.125"±0.005")<br>(.150")3.81 (.060")1.52 (0.060"±0.005")1.52±0.127<br>1.14<br>(.045")<br>2.489±0.254<br>2.03 (.044")1.12 (0.098"±0.010")<br>(.080")2.03 REF.<br>REFLOW SOLDER<br>.635<br>(.025").635 1.143+0.0/-0.152<br>(.045"+0.0/-0.006")<br>**----- End of picture text -----**<br>


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(.080")2.03 REF. 0429 007. WRM L HF<br>REFLOW SOLDER<br>SERIES<br>(.025").635 1.143+0.0/-0.152 AMP Code<br>(.045"+0.0/-0.006") Refer to Amp Code Column of<br>Electrical characteristics table<br>QUANTITY Code<br>WRM = 3000 pieces, Tape and Reel<br>L = Lead-Free device and<br>RoHS compliant device<br>‘HF’ SUFFIX<br>HALOGEN FREE ITEM<br>Packaging<br>Quantity &<br>Packaging Option Packaging Specification Quantity<br> Packaging Code<br>Tape & Reel – 8mm tape EIA-481 Rev. D (IEC 60286, part 3) 3000 WRM<br>**----- End of picture text -----**<br>


© 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 04/30/15