IRKT27/12A

SCRs - Modules Overview

The IRKT27/12A is a thyristor/diode module from the IRK.26 series, rated for 1200 V repetitive peak off-state voltage and 27 A average on-state current. It features an ADD-A-pak GEN V package with a TO-240AA footprint and a thick copper baseplate for thermal management. The device includes a built-in free-wheeling diode and offers high surge capability with a non-repetitive peak forward current of 420 A at 8.3 ms.

SCRs - Modules Feature Summary

• Electrically isolated construction utilizing Direct Bonded Copper substrate with a solid copper baseplate for enhanced mechanical ruggedness and thermal spreading.
• Integrated click-stop terminal fixation to secure electrical connections against axial pull-out forces.
• Standard JEDEC TO-240AA housing design enabling simplified mechanical assembly and compatibility with common heatsink configurations.

SCRs - Modules Applications

• High voltage regulated power supplies
• Lighting circuits
• Temperature control circuits
• Motor speed control circuits
• UPS systems and battery chargers

SCRs - Modules Procurement Notes

Verify the specific dv/dt rating required for the application. Standard versions operate at 500 V/µs, while S90 suffix variants provide 1000 V/µs. Confirm that the ordering code matches the desired isolation voltage and circuit configuration before finalizing procurement.

SCRs - Modules Selection Notes

Select based on the maximum repetitive peak off-state voltage needed, ranging from 400 V to 1600 V within the series. Ensure the thermal resistance characteristics align with the expected conduction angle and case temperature limits. Verify gate triggering requirements against the specified maximum gate voltage and current parameters.

SCRs - Modules Part Context

This component belongs to the IRK.26 series of ADD-A-pak GEN V power modules manufactured by Vishay General Semiconductor - Diodes Division (formerly International Rectifier). The series combines thyristors and diodes in various circuit configurations within a standardized industrial package.

SCRs - Modules Replacement Considerations

IRKT26/12A

SCRs - Modules FAQ

What is the RMS isolation voltage between the circuit and the base?

The module provides 3500 VRMS isolating voltage when tested for one second with all terminals shorted.

How does the S90 suffix affect the device specifications?

The S90 suffix indicates a critical rate of rise of off-state voltage (dv/dt) of 1000 V/µs, compared to the standard 500 V/µs.

What is the maximum holding current for this module?

The maximum holding current is 200 mA at a junction temperature of 25°C with a resistive load and gate open circuit.