IRKU91/08A

Overview

The Vishay IRKU91/08A is a thyristor module from the ADD-A-pak GEN V series, rated for 95 A average on-state current at 85°C and 150 A RMS. It features an 800 V repetitive peak off-state voltage (VRRM) with a maximum non-repetitive surge current of 1785 A at 50 Hz. The device utilizes a thick copper baseplate and Direct Bonded Copper substrate for thermal management, providing a junction-to-case thermal resistance of 0.135 K/W. It includes a 3500 Vrms isolation voltage and operates within a junction temperature range of -40°C to 125°C.

Feature Summary

• Features a solid copper baseplate for improved mechanical ruggedness and easier mounting on heatsinks with increased tolerance for surface roughness.
• Utilizes Direct Bonded Copper (DBC) substrate technology to combine excellent thermal performance with superior mechanical stability.
• Manufactured without hard molding to eliminate direct stress on leads, ensuring long-term reliability under thermal cycling.
• Includes a click-stop feature to secure electrical terminals against axial pull-out forces.

Applications

• High voltage regulated power supplies
• Lighting circuits
• Temperature control circuits
• Motor speed control circuits
• Uninterruptible Power Supply (UPS) systems

Procurement Notes

Verify the specific suffix code to confirm generation and dv/dt ratings. Confirm that the ordering code matches the required voltage rating (08 for 800V). Ensure compatibility with TO-240AA mounting standards. Check for any optional hardware requirements listed in related bulletins. Validate component authenticity through authorized distribution channels.

Selection Notes

Select based on the required average on-state current and blocking voltage. Consider the thermal resistance characteristics when designing heatsink solutions. Evaluate the surge current capability against potential fault conditions. Verify gate triggering parameters match the drive circuit capabilities. Ensure the operating temperature range aligns with the application environment.

Part Context

This component belongs to the IRKU/V71, 91 Series of thyristor modules manufactured by Vishay General Semiconductor - Diodes Division. These modules are part of the Generation V Add-A-pak family, designed for industrial applications requiring high voltage and current handling. The series offers various voltage codes ranging from 400V to 1600V.

Replacement Considerations

IRKU71/08A

FAQ

What is the maximum non-repetitive surge current for the IRKU91/08A?

The maximum non-repetitive surge current is 1785 A at 50 Hz and 1870 A at 60 Hz for a single half-sine wave pulse.

How does the copper baseplate benefit the module's performance?

The thick copper baseplate allows for easier mounting on most heatsinks, improves thermal spreading, and increases tolerance to surface roughness compared to standard packages.

What is the isolation voltage rating of this module?

The module provides a 3500 Vrms isolating voltage between the terminals and the baseplate.