IRKU71/08A

Overview

The IRKU71/08A is a silicon-controlled rectifier module manufactured by Vishay General Semiconductor - Diodes Division. It features an ADD-A-PAK(3 + 4) package with flange mounting and isolated case connection. The device has a maximum repetitive off-state voltage of 800 V and an average on-state current rating of 60 A. The root mean square on-state current is rated at 95 A. Maximum gate trigger voltage is 2.5 V, and maximum gate trigger current is 150 mA. Non-repetitive peak surge currents are specified as 1310 A and 1370 A for 50 Hz and 60 Hz respectively. The holding current maximum is 200 mA. Operating junction temperature range is from -40°C to 125°C.

Feature Summary

• High surge capability utilizing thick aluminum metal die and double stick bonding technology
• Thick copper baseplate combined with Direct Bonded Copper substrate for superior thermal performance
• UL E78996 approved with 3500V RMS isolating voltage between case and heatsink
• Full compatibility with standard TO-240AA mechanical dimensions for easy heatsink mounting

Applications

• High voltage industrial power applications
• AC motor drives
• Inverter circuits
• Welding equipment

Procurement Notes

Verify the specific datasheet revision and electrical characteristics against official Vishay documentation before integration. Confirm that the ADD-A-PAK(3 + 4) pinout matches the target circuit design requirements. Ensure proper isolation voltage ratings are maintained in the final assembly. Check for RoHS compliance status if required by the end application standards. Validate thermal management solutions against the specified junction temperature limits.

Selection Notes

Select this component when an 800 V blocking voltage and 60 A average current rating are required in a compact flange-mountable package. The ADD-A-PAK form factor allows direct replacement in designs originally using TO-240AA compatible modules. Consider the 3500V RMS isolation capability for safety-critical high-voltage systems. Evaluate the thermal resistance characteristics provided in the datasheet for heatsink sizing calculations.

Part Context

This module belongs to the IRK.71 series of thyristor/diode and thyristor/thyristor power modules. The series is characterized by its generation V Add-A-Pak packaging, which integrates excellent thermal performance through Direct Bonded Copper substrates. These modules are designed for robust industrial environments requiring high reliability and ease of installation on grounded heatsinks.

Replacement Considerations

Modules within the same IRK.71 series or other manufacturers' TO-240AA compatible SCR modules may serve as functional substitutes. Verify that replacement parts match the 800 V voltage rating, 60 A current rating, and ADD-A-PAK(3 + 4) pin configuration. Ensure equivalent thermal and isolation specifications are met to maintain system integrity.