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MICROSMD450LR-XC-2
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Product Detailed Parameters
- Description：PTC RESET FUSE 12V 4.5A 1206
- Series：*
- Mfr：Littelfuse Inc.
- Package：Tape & Reel (TR)
- Type：-
- Voltage - Max：-
- Current - Hold (Ih) (Max)：-
- Current - Trip (It)：-
- Current - Max：-
- Time to Trip：-
- Resistance - Initial (Ri) (Min)：-
- Resistance - Post Trip (R1) (Max)：-
- Resistance - 25°C (Typ)：-
- Operating Temperature：-
- Grade：-
- Qualification：-
- Ratings：-
- Mounting Type：-
- Package / Case：-
- Size / Dimension：-
- Height - Seated (Max)：-
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- Lead Spacing：-
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Overview
The MICROSMD450LR-XC-2 is a surface-mount polymer positive temperature coefficient (PPTC) resettable fuse from the Littelfuse microSMD series. It provides overcurrent protection with a maximum voltage rating of 12 VDC and a trip current of 4.5 A. The device features a hold current of 4.5 A and a maximum fault current capacity of 40 A. Designed for compact applications, it utilizes a 1206 (3216 metric) package footprint. The component operates within a temperature range of -40°C to +85°C and meets RoHS compliance standards.
Feature Summary
- Provides automatic circuit recovery after fault conditions without manual replacement
- Utilizes polymer PTC technology for rapid response to overcurrent events
- Designed for high-density surface mount assembly processes
Applications
- Portable electronic devices requiring compact circuit protection
- Consumer electronics interfaces and peripheral connections
- Battery-powered equipment safeguarding
Procurement Notes
Verify that the specific XC suffix aligns with required regulatory or material specifications for your target market. Confirm that the 1206 package dimensions match your PCB land pattern design. Ensure thermal management strategies account for the operating temperature limits during sustained load conditions. Validate that the 12 VDC rating suffices for the highest potential circuit voltage.
Selection Notes
Select this component when space constraints necessitate a 1206 footprint while requiring a 4.5 A trip threshold. Consider the 40 A maximum fault current capability for circuits prone to short-circuit events. Evaluate the low resistance characteristics to minimize power loss in sensitive signal lines. Compare against standard microSMD variants if different voltage ratings or hold currents are needed.
Part Context
This part belongs to the microSMD family of PolySwitch resettable fuses, which are engineered for surface-mount technology integration. The series offers various hold and trip current options within standardized footprints. The MICROSMD450LR-XC-2 specifically addresses applications needing robust protection in limited board areas.
Replacement Considerations
Direct substitutes include other microSMD variants with identical 1206 footprints and similar electrical ratings. Verify compatibility with MICROSMD450LR-C-2 or MICROSMD450LR-XC-2 equivalents from Littelfuse. Cross-reference datasheets to ensure matching voltage and current parameters before substitution.
