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1812L125ZR is listed in the Ptc Resettable Fuses range at ChipApex. The manufacturer field lists Littelfuse Inc.. Its product description is PTC RESET FUSE 1.25A 1812. Review the specifications below when checking this part for your BOM.
Ptc Resettable Fuses specifications for 1812L125ZR
- Description：PTC RESET FUSE 1.25A 1812
- Series：POLY-FUSE®, 1812L
- Mfr：Littelfuse Inc.
- Package：Tape & Reel (TR)
- Type：Polymeric
- Voltage - Max：-
- Current - Hold (Ih) (Max)：1.25 A
- Current - Trip (It)：2.5 A
- Current - Max：100 A
- Time to Trip：400 ms
- Resistance - Initial (Ri) (Min)：50 mOhms
- Resistance - Post Trip (R1) (Max)：140 mOhms
- Resistance - 25°C (Typ)：-
- Operating Temperature：-40°C ~ 85°C
- Grade：-
- Qualification：-
- Ratings：-
- Mounting Type：Surface Mount
- Package / Case：1812 (4532 Metric), Concave
- Size / Dimension：0.179" L x 0.128" W (4.55mm x 3.24mm)
- Height - Seated (Max)：-
- Thickness (Max)：0.049" (1.25mm)
- Lead Spacing：-
Ptc Resettable Fuses datasheet and documents for 1812L125ZR
Ptc Resettable Fuses Overview
The Littelfuse 1812L125ZR is a surface-mount PolySwitch resettable PTC device from the 1812L series. It features a hold current of 1.25 A and a trip current of 2.5 A, with a maximum voltage rating of 6 VDC. The component exhibits a maximum resistance of 140 mΩ and supports a maximum fault current of 100 A. Designed for PCB mounting, it operates within a temperature range of -40°C to +85°C and utilizes an SMD/SMT termination type in a 1812 (4532 metric) package.
Ptc Resettable Fuses Feature Summary
- Provides reliable overcurrent protection through automatic resistance increase during fault conditions
- Enables circuit restoration without manual replacement after cooling down
- Offers compact surface-mount form factor for space-constrained designs
Ptc Resettable Fuses Applications
- Portable electronic devices requiring low-voltage circuit protection
- Consumer electronics power input lines
- Peripheral interface circuits
Ptc Resettable Fuses Procurement Notes
Verify the specific suffix 'ZR' against official Littelfuse documentation to confirm packaging configuration and compliance status. Ensure the selected variant matches the required reel or cut-tape specifications for your assembly process. Cross-reference the part number with the manufacturer's latest datasheet to validate electrical parameters and environmental ratings before procurement.
Ptc Resettable Fuses Selection Notes
Select this component when designing circuits operating at 6 VDC or lower with nominal currents near 1.25 A. Consider the 1812 footprint constraints and the thermal characteristics of the PTC material. Evaluate the trip time requirements against the application's sensitivity to transient overcurrents compared to traditional fuses.
Ptc Resettable Fuses Part Context
This device belongs to the Littelfuse 1812L series of PolySwitch resettable fuses. These components are engineered for surface-mount technology applications where space efficiency and reusability are critical. The series provides a solid-state alternative to one-time fuse elements, offering consistent performance across automotive, telecom, and general industrial sectors.
Ptc Resettable Fuses Replacement Considerations
Consult official Littelfuse substitution guides for verified equivalents. Generic cross-references may not match the precise voltage, current, or physical dimensions required for safe operation.
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