IRKH91/04A

Overview

The IRKH91/04A is a silicon-controlled rectifier (SCR) module manufactured by Vishay General Semiconductor - Diodes Division. It utilizes the ADD-A-PAK (TO-240AA) screw-mount package and contains two SCRs in a series configuration. The device features a maximum repetitive peak off-state voltage of 400 V and an average on-state current rating of 95 A, with a root-mean-square on-state current capacity of 210 A. It supports a non-repetitive peak forward current of 2110 A and operates within a junction temperature range of -40 °C to +125 °C.

Feature Summary

• Dual SCR structure integrated into a single isolated module for high-voltage power applications
• Robust thermal management design utilizing the ADD-A-PAK screw-mount housing
• High surge current capability suitable for demanding industrial switching environments

Applications

• Industrial motor drives and control systems
• High-voltage DC power supply circuits
• Resistive heating and welding equipment controllers

Procurement Notes

Verify the specific suffix 'A' against official Vishay documentation to confirm pinout or electrical tolerances, as generic listings may omit critical variant details. Ensure the procurement source provides the original manufacturer datasheet rather than third-party summaries. Confirm RoHS compliance status directly from the component marking or official specification sheet before finalizing orders.

Selection Notes

Select this component when a dual-series SCR topology is required within a compact TO-240AA footprint. The 400 V rating suits low-to-medium voltage AC/DC conversion tasks. Verify that the gate trigger current requirements align with the driving circuit capabilities. Ensure the mounting surface area accommodates the thermal dissipation needs associated with the 95 A continuous current rating.

Part Context

This part belongs to the Vishay VS-VSKH91 series of thyristor modules. These components are designed for robust performance in heavy-duty power electronics. The series typically offers standardized dimensions for easy integration into existing chassis designs while providing reliable isolation between the terminal and the base plate for safe operation.

Replacement Considerations

The VS-VSKH91/04 is a confirmed substitute part number within the same product family. Both devices share identical electrical ratings and the ADD-A-PAK package form factor. Verify mechanical mounting hole alignment and terminal numbering before swapping these components in existing assemblies.