AS321R030

Overview

The AS321R030 is a radial lead NTC inrush current limiter from the Vishay Ametherm AS32 series. It features a nominal resistance of 1 Ohm with a tolerance of ±25%. The device supports a steady-state current rating of 30 A and withstands voltage ratings up to 680 VAC. Physical dimensions include a 30 mm diameter and 7.8 mm width. It is designed for PCB mounting and provides surge protection for input energies between 250 and 1000 joules.

Feature Summary

• Provides inrush current suppression for power supply inputs
• Radial lead configuration for through-hole PCB integration
• Capable of handling high energy surges up to 1000 joules

Applications

• Power supply input stages
• Industrial control systems
• Consumer electronics AC/DC conversion

Procurement Notes

Verify the specific manufacturer standard lead time, which may vary by region or distributor channel. Confirm that the component meets required RoHS compliance standards for the target market. Ensure the selected supplier offers genuine Vishay / Ametherm products to guarantee thermal performance and reliability specifications are met during operation.

Selection Notes

Select this component when the application requires a 1 Ohm resistance at 25% tolerance and a 30 A steady-state current capacity. The 30 mm diameter form factor suits applications needing robust energy absorption up to 1000 joules. Verify that the operating environment remains within the specified voltage ratings of 120 VAC to 680 VAC for safe operation.

Part Context

This part belongs to the AS32 series of inrush current limiters manufactured by Vishay / Ametherm. The series is engineered to protect sensitive electronic components from high initial current spikes during power-up. These devices utilize negative temperature coefficient thermistor technology to automatically adjust resistance based on temperature changes.

Replacement Considerations

The SL321R030B is a confirmed substitute within the same product family. Both parts share similar electrical characteristics including 1 Ohm resistance and 30 A current rating. Verify physical dimension compatibility before replacement.