LDR21650

Overview

The LDR21650 is an isolated SCR/Diode module manufactured by Powerex Inc. It features a series connection structure containing one Silicon Controlled Rectifier and one diode. The device supports a maximum on-state current of 500A and offers a blocking voltage of 1.6kV. Designed for chassis mounting, this component utilizes an insulated baseplate configuration to facilitate thermal management and electrical isolation within high-power industrial circuits.

Feature Summary

• Integrated series connection combining one SCR and one diode in a single package
• Electrically isolated construction enabling direct mounting to common heatsinks
• Robust mechanical design optimized for chassis installation and screw termination

Applications

• Industrial motor drive systems requiring controlled rectification
• High-power DC power supply architectures
• Static VAR compensator (SVC) units for grid stability
• HVDC transmission converter stations

Procurement Notes

Verify the specific ordering suffix to confirm exact voltage and current ratings, as variations exist within the product family. Confirm RoHS compliance status prior to integration. Note that availability may be limited due to manufacturing lifecycle changes; check for active production status or recommended replacement modules from the manufacturer before finalizing procurement plans.

Selection Notes

Select this module when a combined SCR and diode function is required in a single isolated package. Ensure the system heatsink can accommodate the thermal impedance characteristics of the aluminum nitride isolator. Verify that the mechanical footprint matches the chassis mounting requirements and that the terminal configuration aligns with the existing busbar layout.

Part Context

This component belongs to the Powerex modular semiconductor family designed for heavy-duty industrial applications. It represents a specialized solution for converting AC to controlled DC power while maintaining electrical safety through isolation. The module integrates multiple semiconductor elements into a compact form factor suitable for high-current environments.

Replacement Considerations

The LDR21650 is listed as obsolete. The manufacturer recommends LD420850 as a substitute. Verify that the alternative part meets all electrical and mechanical specifications before implementation.