The 046802.5NR is a surface-mount fuse from Littelfuse, designed for circuit protection in compact electronic devices. Part of the PolySwitch Resettable PPTC (Polymer Positive Temperature Coefficient) series, this device provides automatic overcurrent protection with a rated hold current of 2.5A and a trip current of 5A. It features a 0402 footprint (1.0 mm × 0.5 mm), enabling space-saving integration into high-density PCB designs. The fuse resets after the fault is cleared, eliminating the need for manual replacement, and operates over a wide temperature range (-40°C to +125°C), ensuring reliability in harsh environments.

Key Features

The 046802.5NR combines compact size with robust protection, offering ultra-low resistance (<50 mΩ) to minimize power loss. Its resettable design prevents permanent damage and extends product lifespan. The device features a fast response time (<100 ms) to overcurrent events and withstands repetitive inrush currents without degradation. It meets RoHS compliance and supports automated surface-mount assembly processes. The fuse exhibits excellent thermal stability and is rated for 100V DC, making it suitable for low-voltage applications.

Applications

Primarily used in consumer electronics such as smartphones, tablets, and wearables, the 046802.5NR protects USB ports, battery charging circuits, and I/O interfaces from short circuits and overloads. It is also employed in industrial IoT devices, automotive electronics, and medical equipment where compact, self-resetting protection is critical. Its small footprint and high reliability make it ideal for space-constrained applications in telecommunications, sensors, and power management systems.

Summary

The 046802.5NR combines miniature form factor, self-resetting functionality, and fast overcurrent protection, making it a key component for safeguarding modern electronics in compact designs. Its low resistance, thermal resilience, and compatibility with automated assembly processes cater to the demands of high-volume consumer and industrial applications. This fuse is essential for engineers prioritizing reliability, space efficiency, and cost-effective protection in power distribution circuits.