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MF-SM125-2-99
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Product Detailed Parameters
- Description：PTC RESET FUSE 15V 1.25A 2SMD
- Series：Multifuse®, MF-SM
- Mfr：Bourns Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：Polymeric
- Voltage - Max：15V
- Current - Hold (Ih) (Max)：1.25 A
- Current - Trip (It)：2.5 A
- Current - Max：100 A
- Time to Trip：2 s
- Resistance - Initial (Ri) (Min)：70 mOhms
- Resistance - Post Trip (R1) (Max)：250 mOhms
- Operating Temperature：-40°C ~ 85°C
- Grade：Automotive
- Qualification：AEC-Q200
- Ratings：-
- Mounting Type：Surface Mount
- Package / Case：2-SMD
- Size / Dimension：0.287" L x 0.214" W (7.31mm x 5.44mm)
- Height - Seated (Max)：-
- Thickness (Max)：0.118" (3.00mm)
- Lead Spacing：-
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Overview
The Bourns MF-SM125-2 is a surface-mount Polymer Positive Temperature Coefficient (PPTC) resettable fuse designed for overcurrent protection. It belongs to the MF-SM series and features a compact 2920 (7450 metric) package suitable for SMD/SMT installation. The device maintains a holding current of 1.25 A with a trip current of 2.5 A, operating at a maximum voltage of 15 VDC. It exhibits a typical resistance of 250 mΩ and can withstand a maximum rated current of 100 A. The component functions reliably within an operating temperature range of -40°C to +85°C.
Feature Summary
- Provides robust overcurrent protection using polymer PTC technology that automatically resets after fault clearance.
- Eliminates nuisance tripping caused by ambient temperature variations in demanding environments.
- Offers space-saving surface mount design compared to traditional radial leaded components.
Applications
- Automobile circuitry protection
- Overcurrent surge protection for high reliability electronic equipment
- Industrial transportation systems
- Communication and security equipment
Procurement Notes
Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct packaging configuration. Confirm RoHS compliance status and material declaration details prior to procurement. Cross-reference the Mouser number 652-mfsm125-2 with the supplier's current catalog to validate availability and exact part identification before finalizing purchase orders.
Selection Notes
Select this component when circuit protection requires a low-profile surface mount solution with a 1.25 A holding current. Ensure the application voltage does not exceed 15 VDC and the expected fault currents remain within the 100 A maximum rating. Verify that the operating environment stays within the specified -40°C to +85°C temperature range for optimal performance.
Part Context
This device is part of the Bourns Multifuse MF-SM series, which specializes in high-density surface mount resettable fuses. The series is engineered to provide cost-effective circuit safeguarding while reducing short circuit risks. These components are designed to offer increased resistance protection in compact packages, addressing the needs of designers working in space-constrained layouts.
Replacement Considerations
Consult the official Bourns datasheet for verified substitute part numbers within the MF-SM series or other compatible families. Do not assume interchangeability based on generic specifications alone; verify electrical parameters and physical dimensions against the source document.
