IRKT56/08A

Overview

The Vishay IRKT56/08A is a thyristor/diode module from the IRK.56 series, housed in an ADD-A-pak GEN V package compatible with TO-240AA standards. It features a thick copper baseplate and Direct Bonded Copper substrate for superior thermal performance. The device provides a maximum average on-state current of 60 A and a continuous RMS current of 135 A when used as an AC switch. It supports voltage ratings up to 1600 V, with the '08' suffix indicating an 800 V repetitive peak off-state voltage. The module includes one SCR and one diode element.

Feature Summary

• Utilizes a solid copper baseplate and Direct Bonded Copper substrate for enhanced mechanical ruggedness and thermal spreading.
• Features an industrial standard ADD-A-pak GEN V package fully compatible with TO-240AA mounting dimensions.
• Includes a click-stop feature to secure electrical terminals against axial pull-out.
• Offers high surge capability and UL E78996 approval with 3500 VRMS isolating voltage.

Applications

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

Procurement Notes

Verify the specific voltage code suffix (e.g., 08 for 800V) matches the circuit requirements, as the IRK.56 series spans multiple voltage ratings. Confirm the presence of the auxiliary cathode if required by the design, noting that variants without this feature exist under different ordering codes. Ensure the datasheet revision aligns with the manufacturing batch for accurate thermal resistance values.

Selection Notes

Select based on the required RMS current rating, which reaches 135 A for the IRK.56 series when configured as an AC switch. Consider the thermal resistance characteristics, specifically the junction-to-case value of 0.20 K/W per module for DC operation. Evaluate the non-repetitive surge current capabilities, which vary between 50 Hz and 60 Hz frequencies, to ensure adequate protection against transient overloads.

Part Context

This component belongs to the IRK.41 and IRK.56 series of thyristor/diode and thyristor/thyristor modules manufactured by Vishay General Semiconductor - Diodes Division. The series is designed for general-purpose high-voltage applications, combining high voltage handling with robust mechanical construction suitable for industrial environments.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should verify pinout compatibility and thermal specifications when considering alternative manufacturers or series within the same package style.

FAQ

What is the maximum continuous RMS on-state current for the IRK.56 series?

When used as an AC switch, the maximum continuous RMS on-state current is 135 A.

How is the terminal connection secured in these modules?

The electrical terminals are secured against axial pull-out using a click-stop feature fixed to the module housing.

What is the isolation voltage rating for the IRK.56 series modules?

The modules offer a 3500 VRMS isolating voltage between the circuit and the base.