LDR30850

Overview

The Powerex LDR30850 is a dual Silicon Controlled Rectifier (SCR) module within the POW-R-BLOK family, rated for 800 V repetitive peak forward and reverse blocking voltage and 500 A average on-state current. It features an electrically isolated metal baseplate providing 3000 Vrms isolation at 25°C for one minute at 50 Hz. The device includes compression-bonded elements with low thermal impedance to improve current capability. Electrical characteristics include a peak on-state voltage of 1.50 V at 1570 A, a gate trigger current of 250 mA, and a turn-off time of 250 µs at 130°C junction temperature.

Feature Summary

• Electrically isolated heatsinking eliminates the need for additional insulation components during installation.
• Compression bonded elements ensure reliable performance under high power conditions.
• Includes gate lead kits and M10 terminal hardware for simplified assembly.

Applications

• Bridge circuits
• AC & DC motor drives
• Battery supplies
• Power supplies
• Large IGBT circuit front ends

Procurement Notes

Verify the specific voltage rating suffix in the part number against the ordering table before purchase. Confirm that the required mounting torque specifications for M6 and M10 screws are met during installation. Ensure the application environment stays within the specified operating temperature range of -40 to +130°C. Check for UL recognition status updates as the datasheet indicates it was pending at publication.

Selection Notes

Select this module when phase control and electrical isolation are required in a single package. The 800V rating suits applications where lower voltage blocking is sufficient compared to higher variants in the LDR3 series. Consider the 500A current capacity and thermal resistance values for heatsink design. Verify that the gate trigger requirements align with the driver circuit capabilities.

Part Context

This component belongs to the Powerex LDR3__50 series of Dual SCR Isolated Modules. The series offers various voltage ratings from 800V to 1800V while maintaining a consistent 500A current rating and physical outline. The LDR30850 specifically denotes the 800V variant within this standardized modular platform designed for industrial power electronics.

Replacement Considerations

Direct replacements must match the dual SCR configuration, 500A current rating, and 800V blocking voltage. Verify mechanical compatibility with the POW-R-BLOK outline dimensions and M10 terminal spacing. Ensure equivalent thermal impedance and isolation voltage ratings are maintained for safe operation on common heatsinks.