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MF-USHT125KX-2
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Product Detailed Parameters
- Description：PTC RESET FUSE 12V 1.25A 1210
- Series：Multifuse®, MF-USHT
- Mfr：Bourns Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：Polymeric
- Voltage - Max：12V
- Current - Hold (Ih) (Max)：1.25 A
- Current - Trip (It)：3.75 A
- Current - Max：40 A
- Time to Trip：5 s
- Resistance - Initial (Ri) (Min)：30 mOhms
- Resistance - Post Trip (R1) (Max)：300 mOhms
- Operating Temperature：-40°C ~ 125°C
- Grade：Automotive
- Qualification：AEC-Q200
- Ratings：-
- Mounting Type：Surface Mount
- Package / Case：1210 (3225 Metric), Concave
- Size / Dimension：0.127" L x 0.101" W (3.22mm x 2.58mm)
- Height - Seated (Max)：-
- Thickness (Max)：0.063" (1.60mm)
- Lead Spacing：-
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Overview
The Bourns MF-USHT125KX-2 is a high-temperature polymer PTC resettable fuse from the Multifuse series, designed for surface-mount applications. It features a 125 mA hold current and a 625 mA trip current, with a maximum voltage rating of 9 VDC. The device offers a maximum fault current capacity of 40 A and an initial resistance of 30 mOhms. Housed in a compact 1812 (4532 metric) package, it operates within a temperature range of -40°C to +125°C and complies with AEC-Q200 automotive standards.
Feature Summary
- High-temperature polymer construction enables reliable operation in demanding thermal environments up to 125°C.
- AEC-Q200 qualification ensures compliance with rigorous automotive industry reliability standards.
- Compact 1812 surface-mount footprint supports automated assembly and space-constrained circuit designs.
Applications
- Automotive electronic circuit protection
- Portable consumer electronics power lines
- Industrial control system overcurrent safeguarding
Procurement Notes
Verify component authenticity by cross-referencing the manufacturer part number with official Bourns documentation. Confirm that the received units match the specified 1812 package dimensions and electrical ratings. Ensure storage conditions comply with moisture sensitivity level requirements to maintain solderability and performance integrity prior to assembly.
Selection Notes
Select this component when designing circuits requiring robust overcurrent protection under elevated thermal conditions. The low initial resistance minimizes power loss during normal operation, while the high trip current provides effective fault isolation. Consider the 9V voltage limit and 125mA hold current to ensure compatibility with the target application's power supply characteristics.
Part Context
This device belongs to the Bourns Multifuse MF-USHT series, which specializes in high-temperature polymeric resettable fuses. The series is engineered to replace traditional fusible links in modern surface-mount assemblies, offering reusable protection against overcurrent events without requiring manual replacement after tripping.
Replacement Considerations
Public confirmed substitute part numbers are not available in the provided documentation. Verify exact pinout and thermal characteristics before considering any alternative components from other manufacturers.
