LSP Series - PolySwitch® Battery Strap 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.

Littelfuse PolySwitch®, a pioneer of polymeric positive temperature coefficient (PPTC) resettable devices, offers several material platforms to help protect battery applications. The high trip temperature, broad range of hold current ratings, and high voltage ratings available, combined with automotive qualifications are a unique combination for LSP380 and LSP550.

Features & Benefits:

  • Qualified to AEC-Q200 for automotive applications
  • Compact size (chip length and width) provides 30%~50% size reduction when comparing to the existing Strap PPTC LR4 devices in the market.
  • Hold current ratings 3.8 A and 5.5 A
  • Voltage ratings 16 Vdc
  • Compatible with high-volume electronics assembly
  • Low-resistance devices increase battery operating time
  • RoHS compliant, halogen-free, and lead-free


  • Battery pack protection in E-call, mobile radio, portable medical devices, vacuum cleaner, etc.

Access specifications, certifications, check availability and order parts below

Catalog #IHold (A)ITRIP
Max Volts
Trip Time
Activation Temp (Deg C)Interrupt Current (A)Max Operating Temp (°C)Partner ECAD ModelsStockSamplesCompare
Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s) IPC-Material Declaration
RF4906-000 LSP380 RoHS No 05/20/2020 PbFree No 05/20/2020 CoC_RoHS10_RF4906-000_LSP380 REACH219_Declaration_RF4906-000_(LSP380) Yes
Does not Contain
RF5079-000 LSP550 RoHS No 03/19/2021 PbFree No 03/19/2021 CoC_RoHS10_RF5079-000_(LSP550) REACH211_Declaration_RF5079-000_(LSP550) Yes
Does not Contain
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