LD421650

Overview

The LD421650 is a Dual SCR/Diode Isolated POW-R-BLOK module manufactured by Powerex, Inc. It integrates one Silicon Controlled Rectifier and one Diode within a single isolated package rated for up to 1600 Volts and 500 Amperes average forward current. The device features electrically isolated heatsinking with an aluminum nitride isolator and compression bonded elements on a metal baseplate. Key electrical ratings include a repetitive peak forward and reverse blocking voltage of 1600 V, an RMS forward current of 785 A at 86°C case temperature, and a non-repetitive peak surge current of 17,000 A for one cycle at 60 Hz. The module operates within a junction temperature range of -40 to +130 °C and provides 3000 Vrms isolation.

Feature Summary

• Electrically isolated heatsinking capability allows mounting with other components on a common heatsink without additional insulation parts.
• Aluminum nitride isolator and compression bonded elements provide low thermal impedance for improved current handling.
• UL recognized certification ensures compliance with safety standards for industrial applications.

Applications

• Bridge Circuits
• AC & DC Motor Drives
• Battery Supplies
• Power Supplies
• Large IGBT Circuit Front Ends

Procurement Notes

Verify the complete eight-digit part number against official Powerex documentation before procurement. Confirm that the specific voltage suffix matches the required blocking voltage rating for the application. Ensure mounting torque specifications are strictly followed during installation to maintain mechanical integrity and thermal performance. Check for RoHS compliance status if required by local regulations.

Selection Notes

Select this module for phase control applications requiring integrated rectification in an isolated package. Evaluate the thermal resistance coefficients and maximum allowable case temperatures based on the expected conduction angle and waveform. Ensure the gate trigger requirements align with the driving circuit capabilities. Consider the physical dimensions and M10 terminal threading for heatsink compatibility.

Part Context

This component belongs to the LD42__50 series of Dual SCR/Diode POW-R-BLOK modules from Powerex. The series offers various voltage ratings ranging from 800 to 1600 Volts while maintaining a consistent 500 Ampere current rating. These modules are designed for high-power industrial environments where compact, isolated packaging reduces engineering time and simplifies assembly compared to discrete component solutions.

Replacement Considerations

Direct replacements must match the dual SCR/diode configuration, 500A current rating, and 1600V blocking voltage. Verify that alternative modules offer comparable thermal impedance and isolation voltage ratings. Ensure the replacement package dimensions and terminal configurations fit the existing heatsink design without modification.