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
BodyOpeningOperating TemperaturePartner ECAD ModelsCompare
Replaced By: 0466.125
1251250.00022.3Epoxy SubstrateVery Fast-Acting (FF)-55° to 90°C429.125
Replaced By: 0466.200
1251250.00060.938Epoxy SubstrateVery Fast-Acting (FF)-55° to 90°C429.200
Replaced By: 0466.250
1251250.0010.625Epoxy SubstrateVery Fast-Acting (FF)-55° to 90°C429.250
Replaced By: 0466.375
1251250.00280.375Epoxy SubstrateVery Fast-Acting (FF)-55° to 90°C429.375
Replaced By: 0466.500
63630.0060.2405Epoxy SubstrateVery Fast-Acting (FF)-55° to 90°C429.500
Replaced By: 0466.750
63630.0170.137Epoxy SubstrateVery Fast-Acting (FF)-55° to 90°C429.750
Replaced By: 0466001.
63630.0350.0995Epoxy SubstrateVery Fast-Acting (FF)-55° to 90°C429001
Replaced By: 0466002.
63630.230.0398Epoxy SubstrateVery Fast-Acting (FF)-55° to 90°C429002
Replaced By: 0466003.
32320.70.0262Epoxy SubstrateVery Fast-Acting (FF)-55° to 90°C429003
Replaced By: 0466004.
24241.50.0193Epoxy SubstrateVery Fast-Acting (FF)-55° to 90°C429004
Replaced By: 0466005.
24242.70.0138Epoxy SubstrateVery Fast-Acting (FF)-55° to 90°C429005
0429007.24244.90.009Epoxy SubstrateVery Fast-Acting (FF)-55° to 90°C0429007.
Replaced By: 046601.5
63630.1250.0625Epoxy SubstrateVery Fast-Acting (FF)-55° to 90°C42901.5
Replaced By: 046602.5
32320.50.0307Epoxy SubstrateVery Fast-Acting (FF)-55° to 90°C42902.5
Replaced By: 04661.25
63630.0650.0747Epoxy SubstrateVery Fast-Acting (FF)-55° to 90°C4291.25
Replaced By: 04661.75
63630.150.05Epoxy SubstrateVery Fast-Acting (FF)-55° to 90°C4291.75
Catalog # Certificates
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pdficon Non RoHS Thin Film Fuse Obsoletion

PCN# EFU100-3

pdficon 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...

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tc-icon 429 Series Time Curve Data

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pdficon Circuit Protection Technology Application Matrix Application Guide

Littelfuse is the world leader in the design and manufacturing of fuses for the automotive industrial handheld computer and telecom markets...