MF-MSHT125KX-2

Ptc Resettable Fuses Overview

The Bourns MF-MSHT125KX-2 is a high-temperature surface-mount polymer PTC resettable fuse designed for robust circuit protection. It features a maximum holding current (Ih) of 1.25 A and a trip current (It) of 6.25 A, with a maximum voltage rating of 9V. The device operates within a temperature range of -40°C to 125°C and meets AEC-Q200 automotive qualifications. Initial resistance is typically 30 mOhms, rising to a maximum of 300 mOhms after tripping. Packaged in a compact 1812 (4532 Metric) recessed SMD form factor, it provides overcurrent safeguarding in space-constrained environments.

Ptc Resettable Fuses Feature Summary

• High-temperature polymer construction ensures reliable operation in demanding thermal environments up to 125°C.
• Automotive-grade certification via AEC-Q200 compliance guarantees suitability for critical vehicle electronics.
• Compact 1812 surface-mount package facilitates automated assembly and efficient PCB layout utilization.

Ptc Resettable Fuses Applications

• Automotive electronic circuit protection
• High-reliability industrial equipment overcurrent safeguarding
• Communication systems surge and fault protection

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix 'KX-2' against the manufacturer's official datasheet to confirm exact tolerance and packaging specifications. Ensure that the 9V maximum voltage rating aligns with the target application's circuit requirements. Confirm AEC-Q200 qualification status if the end-use requires strict automotive grade adherence. Check RoHS3 compliance documentation for environmental regulatory alignment prior to integration.

Ptc Resettable Fuses Selection Notes

Select this component when applications require low initial resistance and rapid response in high-temperature zones. The 1.25A holding current suits moderate load protection scenarios. Consider the 9V limit for low-voltage bus protection. The recessed 1812 footprint offers mechanical stability compared to standard packages. Evaluate thermal derating curves for ambient temperatures exceeding standard operating ranges to ensure long-term reliability.

Ptc Resettable Fuses Part Context

This part belongs to the Multifuse® MF-MSHT series, which expands Bourns' portfolio of high-temperature PPTC devices. The series targets applications where standard polymeric fuses may fail due to elevated ambient heat. It complements other Bourns circuit protection solutions by offering a resettable alternative to single-use fuses in automotive and industrial sectors requiring durable, space-efficient overcurrent management.

Ptc Resettable Fuses Replacement Considerations

Consult official cross-reference guides for direct substitutes. Verify that any replacement maintains the 1812 footprint, 1.25A Ih rating, and 9V max voltage. Ensure the alternative also meets AEC-Q200 standards if automotive use is intended. Confirm identical thermal characteristics and package depth to avoid reflow soldering issues.

Ptc Resettable Fuses FAQ

What is the maximum operating temperature for this PTC fuse?

The device is rated for an operating temperature range of -40°C to 125°C.

Does this component meet automotive quality standards?

Yes, the MF-MSHT125KX-2 is qualified under the AEC-Q200 standard for automotive electronic components.