043703.5 - 437 Series

Series: 437
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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.

This 100% Lead Free and RoHS compliant fuse series has been designed specifically to provide over current protection to circuits that see high working ambient temperatures (up to 150°C).

The general design ensures excellent temperature stability and performance reliability.

In addition to this, the high i²t values typical of the Littelfuse Ceramic fuse family ensure high inrush current withstand capability.


  • Operating Temperature -55°C to +150°C
  • 100% Lead-Free and RoHS compliant
  • Suitable for both leaded and lead-free reflow / wave soldering


  • LCD Displays
  • Servers
  • Printers
  • Scanners
  • Data Modems

Property (Mouseover for details) Value
Body Ceramic
Nominal Melting I2T (A2sec) 0.576
Moisture Sensitivity Level IPC/JEDEC J-STD-020C Level 1
Nominal Cold Resistance (Ohms) 0.027
Opening Fast-Acting (F)
Operating Temperature -55° to 150°C
Partner ECAD Models 043703.5

043703.5 ECAD Models

TUV_50119118icon TUVR_J50519871

CSAicon CSA 1422-30 029862

TUVicon TUV_J50519871_20211012

UR UR_JDYX2_E10480_101212364

curus cUR_JDYX8_E10480_101212364

Littelfuse Fuse 437 Series Data Sheet

Littelfuse Fuse 437 Series Ceramic Chip Fuse Data Sheet

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Littelfuse Fuse 437 Series Ceramic Chip Fuse Data Sheet

Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s) IPC-Material Declaration
043703.5WR FUSE 32V FA 1206 3.5A RoHS No 06/06/2008 PbFree No REACH191_Declaration_043703.5WR Yes
Does not Contain IPC_043703.5WR
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