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Product Detailed Parameters
- Description：PTC RESET FUSE 24V 40MA 0603
- Series：POLY-FUSE®, 0603L
- Mfr：Littelfuse Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：Polymeric
- Voltage - Max：24V
- Current - Hold (Ih) (Max)：40 mA
- Current - Trip (It)：120 mA
- Current - Max：20 A
- Time to Trip：1 s
- Resistance - Initial (Ri) (Min)：4 Ohms
- Resistance - Post Trip (R1) (Max)：40 Ohms
- Resistance - 25°C (Typ)：-
- Operating Temperature：-40°C ~ 85°C
- Grade：-
- Qualification：-
- Ratings：-
- Mounting Type：Surface Mount
- Package / Case：0603 (1608 Metric), Concave
- Size / Dimension：0.063" L x 0.032" W (1.60mm x 0.80mm)
- Height - Seated (Max)：-
- Thickness (Max)：0.030" (0.75mm)
- Lead Spacing：-
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Overview
The Littelfuse 0603L004YR is a surface-mount PolySwitch resettable PTC device designed for circuit protection. It features a hold current of 400 mA and a trip current of 1.2 A, operating at a maximum voltage of 6 VDC. The component exhibits an initial resistance of 50 mOhms and a post-trip resistance of 0.6 Ohms. It supports a maximum fault current of 40 A with a power dissipation rating of 500 mW. The device operates within a temperature range of -40°C to +85°C and conforms to the 0603 (1608 metric) package dimensions.
Feature Summary
- Provides automatic overcurrent protection by increasing resistance during fault conditions
- Enables rapid manual or automatic circuit restoration after cooling
- Offers reliable performance in compact surface-mount configurations
Applications
- Portable electronic devices
- Data communication equipment
- Power supply circuits
Procurement Notes
Verify the specific suffix 'YR' against official Littelfuse documentation to confirm reel packaging specifications. Ensure compatibility with standard reflow soldering profiles. Confirm RoHS compliance status through the manufacturer's latest datasheet before finalizing procurement orders.
Selection Notes
Select this component based on the required 400 mA hold current and 6 VDC system voltage. Evaluate thermal management requirements considering the 500 mW power dissipation limit. Compare physical footprint constraints against available PCB space to ensure proper 0603 package integration.
Part Context
This part belongs to the POLY-FUSE 0603L series, which provides cost-effective overcurrent protection solutions. The series utilizes polymer technology to deliver consistent performance across various consumer and industrial applications. It serves as a reusable alternative to traditional single-use fuses in modern electronics design.
Replacement Considerations
Consult official Littelfuse substitution guides for verified equivalents. Generic cross-references may not match critical parameters such as trip time or resistance values.
