429 Series - 1206 Very Fast-Acting Thin-Film Fuse

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Disclaimer Notice

Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

OBSOLETE with the exception of the 7A RoHS device.

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


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

Access specifications, certifications, check availability and order parts below

Catalog #VDC (V)VAC (V)Nominal Melting I2T (A2sec)Resistance
BodyMin Operating Temp (°C)Max Operating Temp (°C)MSLOpeningStockSamplesCompare
0429007.24244.90.009Epoxy Substrate-5590TBDVery Fast-Acting (FF)CheckOrder
Obsolete: 2009 -03-18
Replaced By: 0466.125NR0466.125
1251250.00022.3Epoxy Substrate-5590Very Fast-Acting (FF)
Obsolete: 2008 -11-16
Replaced By: 0466.200NR0466.200
1251250.00060.938Epoxy Substrate-5590Very Fast-Acting (FF)
Obsolete: 2009 -03-18
Replaced By: 0466.250NR0466.250
1251250.0010.625Epoxy Substrate-5590Very Fast-Acting (FF)
Obsolete: 2008 -11-16
Replaced By: 0466.375NR0466.375
1251250.00280.375Epoxy Substrate-5590Very Fast-Acting (FF)
Obsolete: 2008 -11-16
Replaced By: 0466.500NR0466.500
63630.0060.2405Epoxy Substrate-5590Very Fast-Acting (FF)
Obsolete: 2008 -11-16
Replaced By: 0466.750NR0466.750
63630.0170.137Epoxy Substrate-5590Very Fast-Acting (FF)
Obsolete: 2009 -03-18
Replaced By: 0466001.NR0466001.
63630.0350.0995Epoxy Substrate-5590Very Fast-Acting (FF)
Obsolete: 2008 -11-16
Replaced By: 0466002.NR0466002.
63630.230.0398Epoxy Substrate-5590Very Fast-Acting (FF)
Obsolete: 2009 -03-23
Replaced By: 0466003.NR0466003.
32320.70.0262Epoxy Substrate-5590Very Fast-Acting (FF)
Obsolete: 2008 -11-16
Replaced By: 0466004.NR0466004.
24241.50.0193Epoxy Substrate-5590Very Fast-Acting (FF)
Obsolete: 2008 -11-16
Replaced By: 0466005.NR0466005.
24242.70.0138Epoxy Substrate-5590Very Fast-Acting (FF)
Obsolete: 2008 -11-16
Replaced By: 046601.5NR046601.5
63630.1250.0625Epoxy Substrate-5590Very Fast-Acting (FF)
Obsolete: 2008 -11-16
Replaced By: 046602.5NR046602.5
32320.50.0307Epoxy Substrate-5590Very Fast-Acting (FF)
Obsolete: 2008 -11-16
Replaced By: 04661.25NR04661.25
63630.0650.0747Epoxy Substrate-5590Very Fast-Acting (FF)
Obsolete: 2008 -11-16
Replaced By: 04661.75NR04661.75
63630.150.05Epoxy Substrate-5590Very Fast-Acting (FF)
Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s)
0429007.WRM FUSE 24V V/FA 1206 SMF W/MARKG 7A RoHS No 12/31/2001 PbFree No 12/31/2001 Yes
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429icon Fuse 429 Datasheet

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...

EC611 Circuit Protection for Lithium Ion and Lithium Polymer Rechargeable Battery Applications

This application note summarizes how the increased use of Lithium-Ion and Lithium Polymer battery packs in applications where user safety is critical, the implementation of secondary protection circuits will ensure an unsurpassed level of safety with minimal cost impact.

PCN EFU100 3_PCN Obs_Non RoHS_Thin Film fuse_032708icon Non RoHS Thin Film Fuse Obsoletion

PCN# EFU100-3 Littelfuse Inc. would like to inform customers that it will cease production of its Non-RoHS compliant and lead based Surface Mount Thin Film Fuses products on December 31 2008. The product series impacted are the following. Thin Film Fuse Series - 0430, 0433, 0434 and the 0429xxx.WRM series. The final date for which orders will be taken is September 30, 2008. In all cases Littelfuse has RoHS and Lead-Free alternative series now available . The most up to date information on these series can be found on the Littelfuse website, http://www.littelfuse.com/. Littelfuse Inc is implementing this change so that it can continue to pursue a policy of manufacturing and selling "Green" products.

429 Series Time Curve Data

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