IRKT91/14A

Overview

The IRKT91/14A is a dual Silicon Controlled Rectifier (SCR) module manufactured by Vishay General Semiconductor. It features a 1.4 kV blocking voltage and supports an average on-state current of 95 A with a root-mean-square current rating of 210 A. The device utilizes the ADD-A-PAK (3 + 4) package for base mounting. Key electrical specifications include a maximum gate trigger voltage of 2.5 V, a maximum gate trigger current of 150 mA, and a holding current of 250 mA. Non-repetitive surge currents are rated at 1785 A for 50 Hz and 1870 A for 60 Hz frequencies. The operational junction temperature range extends from -40°C to 125°C.

Feature Summary

• Dual SCR configuration within a single modular package
• High current handling capability with 210 A RMS rating
• Robust surge current tolerance for industrial applications
• Standardized base mounting interface for thermal management

Applications

• Industrial motor drives and control systems
• AC power regulation and phase control circuits
• Welding equipment power supplies
• HVDC transmission converter valves

Procurement Notes

Verify the specific datasheet revision and mechanical drawing dimensions prior to integration, as packaging tolerances may vary between production batches. Confirm that the selected heatsink solution accommodates the thermal resistance requirements for the ADD-A-PAK form factor. Ensure that gate drive circuitry provides sufficient current to meet the 150 mA trigger specification under all operating conditions. Cross-reference the part number suffixes to confirm compliance with RoHS directives if required by the final assembly standards.

Selection Notes

Select this component when high voltage isolation and significant current capacity are required in a compact modular format. The dual SCR structure allows for bridge configurations or back-to-back connections without additional discrete components. Consider the thermal performance limits defined by the 125°C junction temperature when designing the cooling system. Evaluate the gate trigger parameters against the available control signal strength to ensure reliable turn-on across the full operating temperature range.

Part Context

This module belongs to the VSKT91 series, which represents Vishay's line of high-power thyristor modules designed for demanding industrial environments. The ADD-A-PAK family provides a standardized footprint for easy replacement and integration into existing power electronics architectures. These modules are engineered to offer superior reliability compared to discrete semiconductor assemblies, reducing board space and simplifying assembly processes for high-current applications.

Replacement Considerations

• IRKT91/14

FAQ

What is the maximum non-repetitive surge current rating for this module?

The IRKT91/14A supports a non-repetitive surge current of 1785 A at 50 Hz and 1870 A at 60 Hz.

Does this module contain one or two SCRs?

The IRKT91/14A contains two SCRs in a single module package.