ND421625

SCRs - Modules Overview

The Powerex ND421625 is a Dual SCR/Diode Isolated POW-R-BLOK module rated for 250 Amperes and up to 1600 Volts. It integrates one Silicon Controlled Rectifier (SCR) and one Diode within a single isolated package. The device features an aluminum nitride insulator and compression bonded elements on a metal baseplate. Electrical characteristics include a repetitive peak forward and reverse blocking voltage of 1600 V, a non-repetitive peak reverse blocking voltage of 800 A, and a minimum dV/dt of 500 V/µs at Tj=130°C with the gate open. Thermal resistance from junction to case is 0.07 °C/W per module.

SCRs - Modules Feature Summary

• Electrically isolated heatsinking design allows mounting with other components on a common heatsink without additional insulation components.
• Utilizes aluminum nitride insulator and compression bonded elements for low thermal impedance and improved current capability.
• Features quick connect gate terminals with provision for keyed mating plugs.

SCRs - Modules Applications

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

SCRs - Modules Procurement Notes

Verify the complete eight-digit part number against official ordering tables to ensure correct voltage and current ratings. Confirm that the specific application requirements align with the absolute maximum ratings provided in the datasheet, particularly regarding thermal management and mounting torque specifications for M6 and M8 screws.

SCRs - Modules Selection Notes

Select this module for applications requiring phase control and isolated packaging. The dual configuration simplifies installation by eliminating the need for clamping components and reducing engineering time. Ensure the operating temperature range of -40 to +130 °C fits the system environment and that the heatsink resistance supports the required output current.

SCRs - Modules Part Context

This component belongs to the ND42__25 series of Dual SCR/Diode Isolated POW-R-BLOK modules manufactured by Powerex Inc. The series offers ratings from 250 Amperes up to 1600 Volts. These modules are designed for robust performance in high-power industrial applications, combining SCR and diode functions in a UL-recognized package.

SCRs - Modules Replacement Considerations

Consult official Powerex documentation for confirmed substitute part numbers within the ND42 series or equivalent POW-R-BLOK modules. Verify compatibility of pinouts, thermal characteristics, and electrical ratings before substitution.

SCRs - Modules FAQ

What is the isolation voltage of the ND421625 module?

The module provides an isolation voltage of 2500 V rms at 25°C.

What are the typical turn-on and turn-off times?

The typical turn-on time is 7 µs at ITM = 100A and VD = 100V. The typical turn-off time is 150 µs at TJ = 130°C, IT = 250A, and Re-Applied dV/dt = 20V/µs.

What is the maximum mounting torque for the terminal screws?

The maximum mounting torque for M8 terminal screws is 110 in.-Lb. (12 Nm).