437 Series - 1206 Size Lead-Free, Halogen Free, High Temperature Very Fast-Acting Ceramic Fuse

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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, RoHS compliant and Halogen-free fuse series has been designed specifically to provide over current protection to circuits that see high working ambient temperatures (up to 150ºC).
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 from -55ºC to +150ºC
  • 100% Lead-free, HalogenFree and RoHS compliant
  • Suitable for both leaded and lead-free reflow / wave soldering


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

Access specifications, certifications, check availability and order parts below

Catalog #VDC (V)VAC (V)Nominal Melting I2T (A2sec)Resistance
BodyMSLOpeningOperating TemperaturePartner ECAD ModelsStockSamplesCompare
0437.2501251250.0032.29CeramicIPC/JEDEC J-STD-020C Level 1Fast-Acting (F)-55° to 150°C0437.250CheckOrder
0437.3751251250.011.33CeramicIPC/JEDEC J-STD-020C Level 1Fast-Acting (F)-55° to 150°C0437.375CheckOrder
0437.50063630.0180.908CeramicIPC/JEDEC J-STD-020C Level 1Fast-Acting (F)-55° to 150°C0437.500CheckOrder
0437.75063630.0640.665CeramicIPC/JEDEC J-STD-020C Level 1Fast-Acting (F)-55° to 150°C0437.750CheckOrder
043700163630.10.36CeramicIPC/JEDEC J-STD-020C Level 1Fast-Acting (F)-55° to 150°C0437001CheckOrder
043700263630.28420.062CeramicIPC/JEDEC J-STD-020C Level 1Fast-Acting (F)-55° to 150°C0437002CheckOrder
043700332320.40.033CeramicIPC/JEDEC J-STD-020C Level 1Fast-Acting (F)-55° to 150°C0437003CheckOrder
043700432321.0240.022CeramicIPC/JEDEC J-STD-020C Level 1Fast-Acting (F)-55° to 150°C0437004CheckOrder
043700532321.9360.016CeramicIPC/JEDEC J-STD-020C Level 1Fast-Acting (F)-55° to 150°C0437005CheckOrder
043700732324.90.01CeramicIPC/JEDEC J-STD-020C Level 1Fast-Acting (F)-55° to 150°C0437007CheckOrder
043700832326.40.0087CeramicIPC/JEDEC J-STD-020C Level 1Fast-Acting (F)-55° to 150°C0437008CheckOrder
043701.563630.1580.209CeramicIPC/JEDEC J-STD-020C Level 1Fast-Acting (F)-55° to 150°C043701.5CheckOrder
043702.532320.38860.043CeramicIPC/JEDEC J-STD-020C Level 1Fast-Acting (F)-55° to 150°C043702.5CheckOrder
043703.532320.5760.027CeramicIPC/JEDEC J-STD-020C Level 1Fast-Acting (F)-55° to 150°C043703.5CheckOrder
04371.2563630.11170.318CeramicIPC/JEDEC J-STD-020C Level 1Fast-Acting (F)-55° to 150°C04371.25CheckOrder
04371.7563630.24690.071CeramicIPC/JEDEC J-STD-020C Level 1Fast-Acting (F)-55° to 150°C04371.75CheckOrder
Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s) IPC-Material Declaration
0437.250WR FUSE 125V FA 1206 .250A RoHS No 06/06/2008 PbFree No CoC_RoHS10_0437.250WR REACH219_Declaration_0437.250WR Yes
Does not Contain IPC_0437WR_-.250A-1.50A
0437.375WR FUSE 125V FA 1206 .375A RoHS No 06/06/2008 PbFree No CoC_RoHS10_0437.375WR REACH201_Declaration_0437.375WR Yes
Does not Contain
0437.500WR FUSE 63V FA 1206 .500A RoHS No 06/06/2008 PbFree No CoC_RoHS10_0437.500WR REACH205_Declaration_0437.500WR Yes
Does not Contain IPC_0437.500WR
0437.750WR FUSE 63V FA 1206 .750A RoHS No 06/06/2008 PbFree No CoC_RoHS10_0437.750WR REACH219_Declaration_0437.750WR Yes
Does not Contain IPC_0437WR_-.250A-1.50A
0437001.WR FUSE 63V FA 1206 1A RoHS No 06/06/2008 PbFree No CoC_RoHS10_0437001.WR REACH_SVHC Declaration_0437001.WR Yes
Does not Contain IPC_0437WR_-.250A-1.50A
0437002.WR FUSE 63V FA 1206 2A RoHS No 06/06/2008 PbFree No CoC_RoHS10_0437002.WR REACH219_Declaration_0437002.WR Yes
Does not Contain IPC_0437002.WR
0437003.WR FUSE 32V FA 1206 3A RoHS No 06/06/2008 PbFree No CoC_RoHS10_0437003.WR Yes
0437004.WR FUSE 32V FA 1206 4A RoHS No 06/06/2008 PbFree No CoC_RoHS10_0437004.WR REACH_SVHC Declaration_0437004.WR Yes
Does not Contain IPC_0437004.WR
0437005.WR FUSE 32V FA 1206 5A RoHS No 06/06/2008 PbFree No CoC_RoHS10_0437005.WR REACH219_Declaration_0437005.WR Yes
Does not Contain IPC_0437005.WR
0437007.WR FUSE 32V FA 1206 7A RoHS No 06/06/2008 PbFree No CoC_RoHS10_0437007.WR REACH219_Declaration_0437007.WR Yes
Does not Contain IPC_0437007.WR
0437008.WR FUSE 32V FA 1206 8A RoHS No 06/06/2008 PbFree No CoC_RoHS10_0437008.WR REACH219_Declaration_0437008.WR Yes
Does not Contain IPC_0437008.WR
043701.5WR FUSE 63V FA 1206 1.5A RoHS No 06/06/2008 PbFree No REACH201_Declaration_043701.5WR Yes
Does not Contain IPC_043701.5WR
043702.5WR FUSE 32V FA 1206 2.5A RoHS No 06/06/2008 PbFree No REACH201_Declaration_043702.5WR Yes
Does not Contain IPC_043702.5WR
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
04371.25WR FUSE 63V FA 1206 1.25A RoHS No 06/06/2008 PbFree No REACH191_Declaration_04371.25WR Yes
Does not Contain IPC_0437WR_-.250A-1.50A
04371.75WR FUSE 63V FA 1206 1.75A RoHS No 06/06/2008 PbFree No 06/06/2008 CoC_RoHS10_04371.75WR REACH_SVHC Declaration_04371.75WR Yes
Does not Contain
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