434 Series - OBSOLETE - SlimLine 0603 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.

The 434 series fast-acting surface mount fuse series is 
an ultra small (0603 size) thin-film device designed for 
secondary protection of circuits used in space constrained 
applications such as hand-held portable electronic devices. 
For RoHS compliant and lead-free design, please refer to 
the Littelfuse 467 series thin film fuse


  • The SlimLine 0603 fuse is an extremely small, low profile design (0603 chip size) utilizing thin-film technology to achieve precise control of electrical characteristics.
  • The lower height profile produces a flat surface for improved performance in pick-and-place operations and an alternate solution for height critical applications.

Access specifications, certifications, check availability and order parts below

Catalog #Amps (A)VDC (V)VAC (V)Nominal Melting I2T (A2sec)Resistance
Interrupting RatingBodyMin Operating Temp (°C)Max Operating Temp (°C)Marking CodeOpeningSizeStockCompare
Obsolete: 2008 -12-31
Replaced By: 0467.250NR0467.250
0.2532320.0030.37550A@32VDCEpoxy Substrate-5590DVery Fast-Acting (FF)0603 (1608)
Obsolete: 2008 -12-31
Replaced By: 0467.375NR0467.375
0.37532320.00530.26550A@32VDCEpoxy Substrate-5590EVery Fast-Acting (FF)0603 (1608)
Obsolete: 2008 -12-31
Replaced By: 0467.500NR0467.500
0.532320.00870.19350A@32VDCEpoxy Substrate-5590FVery Fast-Acting (FF)0603 (1608)
Obsolete: 2008 -12-31
0.6832320.01090.12550A@32VDCAdvanced High Temperature Substrate-5590XVery Fast-Acting (FF)0603 (1608)Check
Obsolete: 2008 -12-31
Replaced By: 0467.750NR0467001.
0.7532320.01710.11450A@32VDCAdvanced High Temperature Substrate-5590GVery Fast-Acting (FF)0603 (1608)
Obsolete: 2008 -12-31
Replaced By: 0467001.NR04671.25
132320.02120.07250A@32VDCAdvanced High Temperature Substrate-5590HVery Fast-Acting (FF)0603 (1608)
Obsolete: 2008 -12-31
Replaced By: 0467002.NR046701.5
232320.1040.03635A@32VDCAdvanced High Temperature Substrate-5590NVery Fast-Acting (FF)0603 (1608)
Obsolete: 2008 -12-31
Replaced By: 0467003.NR04671.75
332320.1980.02335A@32VDCAdvanced High Temperature Substrate-5590PVery Fast-Acting (FF)0603 (1608)
Obsolete: 2008 -12-31
Replaced By: 0467004.NR0467002.
432320.3520.01735A@32VDCAdvanced High Temperature Substrate-5590SVery Fast-Acting (FF)0603 (1608)
Obsolete: 2008 -12-31
Replaced By: 0467005.NR046702.5
532321.2970.01335A@32VDCAdvanced High Temperature Substrate-5590TVery Fast-Acting (FF)0603 (1608)
Obsolete: 2008 -12-31
Replaced By: 046701.5NR0467003.
1.532320.05260.04835A@32VDCAdvanced High Temperature Substrate-5590KVery Fast-Acting (FF)0603 (1608)
Obsolete: 2008 -12-31
Replaced By: 046702.5NR046703.5
2.532320.1750.02835A@32VDCAdvanced High Temperature Substrate-5590OVery Fast-Acting (FF)0603 (1608)
Obsolete: 2008 -12-31
Replaced By: 046703.5NR0467004.
3.532320.2650.01935A@32VDCAdvanced High Temperature Substrate-5590RVery Fast-Acting (FF)0603 (1608)
Obsolete: 2008 -12-31
Replaced By: 04671.25NR0467005.
1.2532320.0320.05435A@32VDCAdvanced High Temperature Substrate-5590JVery Fast-Acting (FF)0603 (1608)
Obsolete: 2008 -12-31
Replaced By: 04671.75NR04671.75
1.7532320.06610.03935A@32VDCAdvanced High Temperature Substrate-5590LVery Fast-Acting (FF)0603 (1608)

Littelfuse_Phils_ISO9001_102407icon 2022-06-17_ISO 9001 2015_LF Phils

PhilsISO14001Certificateicon 2022-04-19_ISO 14001-2015_LF Phils

434icon Fuse 434 Datasheet

The 434 series fast-acting surface mount fuse series is an ultra small (0603 size) thin-film device...

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.

434 Series Time Curve Data

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