IRKT26/16A

Overview

The IRKT26/16A is a thyristor/diode module from the IRK.26 series, rated for 1600 V repetitive off-state voltage and 27 A average on-state current. It features a TO-240AA compatible ADD-A-pak Gen V package with an isolated copper baseplate. The device includes one thyristor element and one diode element, providing high surge capability with a non-repetitive peak on-state current of 400 A at 50 Hz. It operates within a junction temperature range of -40 to 125 °C.

Feature Summary

• High voltage industrial standard package with thick aluminum die and double stick bonding
• Thick copper baseplate for improved thermal spread and mechanical ruggedness
• Direct Bonded Copper substrate for excellent thermal performance
• Click-stop feature securing electrical terminals against axial pull-out

Applications

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

Procurement Notes

Verify the specific dv/dt rating required for the application. Standard versions have a critical rate of rise of 500 V/µs. If a higher rating of 1000 V/µs is needed, confirm the presence of the S90 suffix in the part number (e.g., IRKT26/16AS90). Ensure mounting torque specifications are followed to maintain isolation integrity.

Selection Notes

Select this module for general purpose high voltage applications requiring robust thermal management. The ADD-A-pak Gen V design eliminates hard molding stress on leads. Consider the 3500 Vrms isolation voltage when designing for grounded heatsink configurations. Verify conduction angle derating curves if operating below 180 degrees.

Part Context

This component belongs to the IRK.26 series of thyristor/diode modules manufactured by Vishay General Semiconductor. The series utilizes the Generation V Add-A-pak technology, combining Direct Bonded Copper substrates with solid copper baseplates. These modules are designed for industrial level qualification and offer full compatibility with the TO-240AA footprint.

Replacement Considerations

IRKT26/16AS90 provides enhanced dv/dt immunity of 1000 V/µs compared to the standard 500 V/µs version.

FAQ

What is the maximum RMS isolation voltage?

The module offers 2500 Vrms isolation for 1 minute and 3500 Vrms for 1 second between the circuit and the base.

How does the package design improve thermal performance?

It uses a Direct Bonded Copper substrate combined with a solid copper baseplate at the bottom, which improves thermal spread and allows easier mounting on heatsinks with surface roughness tolerance.

What is the maximum non-repetitive peak on-state current?

The ITSM is 400 A for a 10 ms pulse at 50 Hz or 420 A for an 8.3 ms pulse at 60 Hz.