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MF-USML550/12-2
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Product Detailed Parameters
- Description：PTC RESET FUSE 12V 5.5A 1210
- Series：Multifuse®, MF-USML/X
- Mfr：Bourns Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：Polymeric
- Voltage - Max：12V
- Current - Hold (Ih) (Max)：5.5 A
- Current - Trip (It)：11:00 AM
- Current - Max：50 A
- Time to Trip：2 s
- Resistance - Initial (Ri) (Min)：1 mOhms
- Resistance - Post Trip (R1) (Max)：10 mOhms
- Operating Temperature：-40°C ~ 85°C
- Grade：-
- Qualification：-
- 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)：0.047" (1.20mm)
- Lead Spacing：-
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Overview
The Bourns MF-USML550/12-2 is a surface-mount polymer positive temperature coefficient (PPTC) resettable fuse from the Multifuse USML series. It provides overcurrent protection in compact SMD packages designed for high-voltage and high-temperature environments. The component utilizes a 125°C polymer PTC element to mitigate short-circuit risks and eliminate tripping caused by temperature variations. It offers robust circuit protection with low ohmic resistance, suitable for applications requiring space-saving solutions compared to traditional radial lead components.
Feature Summary
- Polymer PTC technology for overcurrent protection
- Surface mount (SMD) package design
- High-temperature capability up to 125°C
- Eliminates temperature-induced tripping
Applications
- Automotive circuit protection
- Industrial transportation systems
- Communication equipment
- Security systems
- Consumer electronics
Procurement Notes
Verify the specific hold current rating of 550mA against system requirements. Confirm the voltage rating aligns with the application's maximum operating voltage. Ensure the package type matches the PCB footprint. Check for RoHS compliance status if required. Validate that the 125°C temperature rating suits the thermal environment.
Selection Notes
Select this component for applications requiring compact overcurrent protection in high-temperature environments. The USML series is designed for high-voltage applications. Consider the low ohmic resistance for minimal power loss. Evaluate the space-saving benefits of the SMD package versus traditional radial leads. Ensure the device meets the specific thermal and electrical constraints of the target circuit.
Part Context
This part belongs to the Bourns Multifuse USML series of surface-mount PPTC resettable fuses. The series is characterized by its use of 125°C polymer PTC elements. It is engineered for robust protection in harsh conditions. The USML designation indicates the specific product line within the broader Multifuse portfolio.
Replacement Considerations
Consult the official Bourns discontinuation list if available. Identify equivalent parts from the same USML series with matching electrical ratings. Verify package compatibility for direct replacement. Cross-reference technical specifications to ensure performance parity.
