LTC4381IDKE-4#TRPBF

Overview

The LTC4381IDKE-4#TRPBF is a low quiescent current eFuse and surge stopper manufactured by Analog Devices Inc. It integrates a 9mΩ MOSFET to provide board-level protection against input voltage surges, reverse polarity, and overcurrent conditions. The device supports an input voltage range of 4V to 72V with a continuous current rating of 500mA. It features adjustable current limiting and thermal foldback for robust fault management. Packaged in a compact 32-lead DFN (7mm x 5mm) surface-mount format, it operates within a temperature range of -40°C to +125°C.

Feature Summary

• Integrates a low on-resistance power MOSFET for efficient power distribution
• Provides comprehensive protection against input voltage surges and reverse polarity
• Features adjustable current limit control via external resistor
• Includes thermal foldback mechanism to manage heat during faults

Applications

• Industrial equipment power distribution
• Automotive electronics systems
• Avionics power management
• Telecommunications infrastructure

Procurement Notes

Verify the specific suffix 'TRPBF' indicates tape-and-reel packaging when sourcing components. Confirm that the 'I' grade designation meets the required industrial operating temperature specifications for the target application environment. Ensure compatibility with the 32-lead DFN footprint during PCB layout validation.

Selection Notes

Select this component for applications requiring high-voltage surge protection with minimal standby current consumption. The integrated MOSFET eliminates the need for discrete protection circuits, reducing board space. Consider the 500mA current rating and 72V maximum input voltage limits to ensure adequate headroom for system requirements.

Part Context

This part belongs to the LTC4381 family of low quiescent current eFuses designed for board mount surge protection. It serves as a replacement for traditional fuse and discrete MOSFET solutions, offering superior performance in managing transient events while maintaining low power consumption during normal operation.

Replacement Considerations

LTC4381ADKE-4#TRPBF

FAQ

What is the function of the thermal foldback feature?

Thermal foldback reduces the current limit threshold as the junction temperature increases, preventing thermal overload during sustained fault conditions.

How is the current limit adjusted?

The current limit is set using an external resistor connected to the ILIM pin, allowing customization based on load requirements.