LDR21850

Overview

The LDR21850 is a high-power silicon controlled rectifier module manufactured by Powerex Inc. It features a series connection configuration integrating one SCR and one diode within a single chassis mount package. The device is rated for an off-state voltage of 1.8 kV and supports a continuous on-state current of 785 A. Designed for robust industrial environments, this component utilizes a baseplate mounting structure to facilitate efficient thermal management and mechanical stability in high-current power conversion systems.

Feature Summary

• Integrates a single SCR and diode in a series connection topology
• Rated for 1.8 kV off-state blocking voltage capability
• Supports high continuous current handling up to 785 A
• Designed for secure chassis mounting applications

Applications

• Industrial motor drive systems
• High-power DC-AC inversion circuits
• Resistive load control applications
• Heavy-duty power supply units

Procurement Notes

Verify the specific datasheet revision and manufacturer documentation to confirm electrical ratings and pinout configurations before integration. Ensure that thermal interface materials and mounting hardware meet the mechanical requirements for chassis installation. Cross-reference part numbers with official Powerex catalogs to distinguish between identical model designations and potential variant differences.

Selection Notes

Select this module when applications require high-voltage blocking capabilities combined with substantial continuous current capacity in a compact form factor. Evaluate thermal resistance characteristics against system heat dissipation limits. Confirm that the gate trigger specifications align with available control circuitry voltages and current outputs for reliable switching performance.

Part Context

This component belongs to the Powerex family of power semiconductor modules designed for demanding industrial environments. Powerex specializes in manufacturing thyristors and diodes for heavy-duty applications. The LDR21850 represents a standard solution for high-power electronics where reliability and thermal performance are critical operational factors.

Replacement Considerations

Consult official Powerex documentation for direct cross-references or recommended substitute part numbers. Verify that any alternative components match the 1.8 kV voltage rating and 785 A current capacity while maintaining compatible physical dimensions and mounting styles.