AS351R040

Overview

The AS351R040 is an NTC thermistor inrush current limiter from the AS35 series by Vishay Ametherm. It features a nominal resistance of 1 Ohm with a tolerance of ±25% and a maximum steady-state current rating of 40 A. The component supports voltage ratings of 120 VAC, 240 VAC, 480 VAC, and 680 VAC. It has a cylindrical body diameter of 36 mm (1.417 inches) and utilizes radial leads for PCB mounting. The device is designed to withstand significant inrush energy, specifically rated for 800 Joules, making it suitable for high-power applications requiring robust surge protection.

Feature Summary

• Utilizes negative temperature coefficient (NTC) technology to provide high initial resistance that decreases as temperature rises during operation.
• Engineered to absorb high-energy electrical surges, capable of withstanding up to 800 Joules of inrush energy without failure.
• Supports multiple AC voltage standards including 120V, 240V, 480V, and 680V for versatile industrial integration.

Applications

• Power supply input stages
• Motor drive circuits
• Industrial control systems

Procurement Notes

Verify the specific datasheet version provided by the manufacturer or authorized distributor to confirm exact thermal characteristics and mechanical dimensions. Ensure that the selected component meets the required peak current and energy absorption specifications for the target application circuit. Cross-reference the lead style and pitch requirements with the PCB layout design prior to ordering.

Selection Notes

Select this component when the application requires handling high inrush currents up to 40 A with a low steady-state resistance of 1 Ohm. Consider the 800 Joule energy rating for applications involving large capacitive loads or transformer inrush. Ensure the operating environment allows for adequate heat dissipation given the radial PCB mount configuration and physical size.

Part Context

This part belongs to the AS35 series of inrush current limiters, which are specialized NTC thermistors designed for circuit protection. The series offers various resistance and current combinations to suit different power levels. Vishay Ametherm manufactures these components to provide reliable surge suppression in electronic equipment where sudden current spikes could damage sensitive downstream components.

Replacement Considerations

Direct substitutes include parts within the same AS35 series with matching electrical parameters, such as similar resistance and current ratings. Verify that any replacement maintains the 800 Joule energy rating and compatible voltage ratings. Mechanical compatibility, including diameter and lead spacing, must be confirmed before substitution.