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MICROSMD450LR-2
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Product Detailed Parameters
- Description：PTC RESET FUSE 5V 4.5A 1210
- Series：PolySwitch®, microSMD
- Mfr：Littelfuse Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：Polymeric
- Voltage - Max：5V
- Current - Hold (Ih) (Max)：4.5 A
- Current - Trip (It)：9:00 AM
- Current - Max：50 A
- Time to Trip：2 s
- Resistance - Initial (Ri) (Min)：2 mOhms
- Resistance - Post Trip (R1) (Max)：8 mOhms
- Resistance - 25°C (Typ)：-
- Operating Temperature：-40°C ~ 80°C
- 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 MICROSMD450LR-2 is a surface-mount polymeric positive temperature coefficient (PPTC) resettable fuse from the Littelfuse microSMD series. It features a maximum voltage rating of 5VDC and a hold current of 4.5A, with a trip current of 9A. The device has a maximum fault current rating of 50A and operates within a temperature range of -40°C to +85°C. Packaged in a 1210 (3225 Metric) concave footprint, it utilizes matte tin terminations for soldering.
Feature Summary
- Provides overcurrent protection through automatic resistance increase upon thermal activation
- Features a low-profile concave design optimized for space-constrained surface mount applications
- Offers repeated circuit protection without requiring manual replacement after fault clearance
Applications
- Portable electronic devices requiring compact circuit protection
- Battery-powered equipment and power management circuits
- Consumer electronics utilizing low-voltage DC power supplies
Procurement Notes
Verify component availability status as this part number may be obsolete or discontinued by the manufacturer. Confirm that any substitute components meet identical electrical ratings and physical dimensions. Ensure compliance with RoHS directives and relevant safety certifications required for the target application before procurement.
Selection Notes
Select this component based on its specific 5VDC voltage limit and 4.5A hold current requirements. Evaluate the 1210 package size against PCB layout constraints. Consider the 50A maximum interrupt rating to ensure adequate fault handling capability for the intended circuit environment.
Part Context
This device belongs to the microSMD family of PTC resettable fuses designed for high-density surface mount technology. The series provides reliable overcurrent protection solutions for modern electronic assemblies where traditional fuses are impractical due to size or maintenance requirements.
Replacement Considerations
Publicly confirmed substitutes include the 1210L450SLWR. Verify that alternative parts match the 5VDC rating, 4.5A hold current, and 1210 package dimensions to ensure functional compatibility.
