1812L Series - PolySwitch® Lead-Free Surface Mount Resettable PPTC

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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 1812L series device provides surface mount overcurrent protection for applications where resettable protection is desired.


  • RoHS compliant and lead-free
  • Fast response to fault currents
  • Compact design saves board space
  • Low resistance
  • Low-profile
  • Compatible with high temperature solders

Access specifications, certifications, check availability and order parts below

Catalog #IHold (A)ITRIP
Max Volts
Trip Time
(deg C)
1812L0100.10.3301000.81.6150.51.5-40¦C - + 85¦C1812 (4532)7Surface MountCheckOrder
1812L010/600.10.360100.81.6150.51.5-40¦C - + 85¦C1812 (4532)Surface MountCheckOrder
1812L0140.140.3460100.81.561.50.15-40¦C - + 85¦C1812 (4532)4Surface MountCheckOrder
1812L0200.20.4301000.80.8580.02-40¦C - + 85¦C1812 (4532)2.9Surface MountCheckOrder
1812L020/600.20.460400.81.44.412-40¦C - + 85¦C1812 (4532)Surface MountCheckOrder
1812L035/300.350.7530400.80.41.780.15-40¦C - + 85¦C1812 (4532)Surface MountCheckOrder
1812L0500.51151000.80.15180.15-40¦C - + 85¦C1812 (4532)0.6Surface MountCheckOrder
1812L050/300.51301000.80.15180.15-40¦C - + 85¦C1812 (4532)Surface MountCheckOrder
1812L050/600.51601001.50.15180.15-40¦C - + 85¦C1812 (4532)Surface MountCheckOrder
1812L0750.751.513.21000.80.10.4580.2-40¦C - + 85¦C1812 (4532)0.26Surface MountCheckOrder
1812L075/240.751.5241000.80.110.2980.2-40¦C - + 85¦C1812 (4532)0.2Surface MountCheckOrder
1812L075/330.751.5331000.80.110.480.2-40¦C - + 85¦C1812 (4532)0.26Surface MountCheckOrder
1812L1101.12.281000.80.040.2180.3-40¦C - + 85¦C1812 (4532)0.12Surface MountCheckOrder
1812L110/161.11.95161000.80.060.1880.5-40¦C - + 85¦C1812 (4532)0.12Surface MountCheckOrder
1812L110/241.11.9524200.¦C - + 85¦C1812 (4532)0.12Surface MountCheckOrder
1812L110/331.11.9533200.¦C - + 85¦C1812 (4532)0.12Surface MountCheckOrder
1812L1251.252.5161000.80.050.1480.4-40¦C - + 85¦C1812 (4532)0.09Surface MountCheckOrder
1812L125/161.252.5161000.80.050.1480.4-40¦C - + 85¦C1812 (4532)Surface MountCheckOrder
1812L125/61.252.561000.80.050.1480.4-40¦C - + 85¦C1812 (4532)0.09Surface MountCheckOrder
1812L1501.25381000.80.040.1180.3-40¦C - + 85¦C1812 (4532)0.07Surface MountCheckOrder
1812L150/121.53121000.80.040.1180.5-40¦C - + 85¦C1812 (4532)0.07Surface MountCheckOrder
1812L150/161.53161000.80.040.1180.5-40¦C - + 85¦C1812 (4532)Surface MountCheckOrder
1812L150/241.5324200.80.040.1281.5-40¦C - + 85¦C1812 (4532)0.07Surface MountCheckOrder
1812L1601.62.881000.80.030.181-40¦C - + 85¦C1812 (4532)0.066Surface MountCheckOrder
1812L160/121.62.8121000.80.030.181-40¦C - + 85¦C1812 (4532)0.066Surface MountCheckOrder
1812L20023.581000.80.020.0682-40¦C - + 85¦C1812 (4532)0.04Surface MountCheckOrder
1812L200/1223.51210020.020.0782-40¦C - + 85¦C1812 (4532)Surface MountCheckOrder
1812L200/1623.51610010.020.0782-40¦C - + 85¦C1812 (4532)0.04Surface MountCheckOrder
1812L200TH2481000.80.020.0782-40¦C - + 85¦C1812 (4532)Surface MountCheckOrder
1812L2602.6561000.80.0150.04782.5-40¦C - + 85¦C1812 (4532)0.03Surface MountCheckOrder
1812L260/122.65121000.80.0150.05585-40¦C - + 85¦C1812 (4532)Surface MountCheckOrder
1812L260/162.65161001.20.0150.05165-40¦C - + 85¦C1812 (4532)0.03Surface MountCheckOrder
1812L260TH2.6581000.80.0150.04782.5-40¦C - + 85¦C1812 (4532)0.03Surface MountCheckOrder
1812L3003561000.80.0120.0484-40¦C - + 85¦C1812 (4532)Surface MountCheckOrder

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