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MICROSMD250LR-A-2
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Product Detailed Parameters
- Description：PTC RESET FUSE 6V 2.5A 1210
- Series：PolySwitch®, LoRho
- Mfr：Littelfuse Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：Polymeric
- Voltage - Max：6V
- Current - Hold (Ih) (Max)：2.5 A
- Current - Trip (It)：5.2 A
- Current - Max：50 A
- Time to Trip：5 s
- Resistance - Initial (Ri) (Min)：5 mOhms
- Resistance - Post Trip (R1) (Max)：-
- Resistance - 25°C (Typ)：-
- Operating Temperature：-
- Grade：-
- Qualification：-
- Ratings：-
- Mounting Type：Surface Mount
- Package / Case：1210 (3225 Metric), Concave
- Size / Dimension：0.127" L x 0.102" W (3.22mm x 2.58mm)
- Height - Seated (Max)：-
- Thickness (Max)：0.039" (1.00mm)
- Lead Spacing：-
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Overview
The MICROSMD250LR-A-2 is a polymeric PTC resettable fuse from the Littelfuse microSMD series, designed for surface-mount applications. It features a hold current of 2.5 A and a trip current of 5.0 A at 6 VDC maximum voltage. The device has a minimum resistance of 5 mΩ and a maximum resistance of 21 mΩ, with a power dissipation rating of 1 W. It supports a maximum fault current of 50 A and operates within a temperature range of -40°C to +85°C. The component measures 3.43 mm in length, 2.8 mm in width, and 1 mm in height, utilizing matte tin terminals.
Feature Summary
- Utilizes polymeric positive temperature coefficient technology for automatic circuit protection
- Features low-profile surface-mount construction for compact PCB integration
- Provides repeatable overcurrent protection without manual replacement
Applications
- Portable electronic devices requiring space-constrained circuit protection
- Consumer electronics circuits needing low-voltage overcurrent safeguarding
- Industrial control boards requiring reliable surface-mount fusing
Procurement Notes
Verify component authenticity through authorized Littelfuse distributors or certified suppliers. Confirm that the part number matches MICROSMD250LR-A-2 exactly, as suffixes indicate specific package or tape configurations. Check datasheets for moisture sensitivity levels and reflow soldering profiles to ensure proper handling during assembly. Validate that the received units meet the specified electrical parameters for hold and trip currents before integration into production lines.
Selection Notes
Select this component when a 2.5 A hold current and 6 VDC rating are required for surface-mount designs. Consider the 1 W power dissipation capability and 50 A interrupt rating for robust fault protection. Ensure the 1210 footprint fits the available PCB area. Evaluate thermal management needs given the operating temperature limits and self-heating characteristics under normal load conditions compared to alternative resettable fuses.
Part Context
This part belongs to the microSMD family of resettable fuses, which are engineered for high-volume surface-mount manufacturing. The series offers various current ratings and voltage options to suit different circuit requirements. The MICROSMD250LR-A-2 specifically targets applications demanding low resistance and high current handling in a small form factor, distinguishing it from through-hole or larger SMD alternatives.
Replacement Considerations
MICROSMD250F-2 serves as a comparable alternative within the same series but may differ in resistance and trip characteristics. Verify dimensional compatibility and electrical specifications against the original design requirements before substitution. Consult official Littelfuse documentation for detailed cross-reference data and performance comparisons between variants.
