LD431650

Overview

The LD431650 is a Dual SCR Isolated POW-R-BLOK module manufactured by Powerex, Inc. It features an isolated packaging design suitable for phase control applications and easy mounting on common heatsinks. The module supports up to 1600 Volts repetitive peak forward and reverse blocking voltage (VDRM & VRRM) and handles a 500 Ampere average forward current at 86°C case temperature with 180° conduction. Key electrical parameters include a maximum rate-of-rise of on-state current (di/dt) of 200 A/µs, a typical minimum dV/dt of 1000 V/µs, and a junction-to-case thermal resistance of 0.0325 °C/W per module. The unit weighs approximately 1500 g and operates within a junction temperature range of -40 to +130 °C.

Feature Summary

• Electrically isolated heatsinking utilizing aluminum nitride isolator
• Compression bonded elements with metal baseplate
• Low thermal impedance for improved current capability
• UL recognized for safety compliance

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 rating suffix matches the required application blocking voltage. Ensure mounting hardware complies with specified torque limits for M6 and M10 screws to maintain isolation integrity and thermal performance.

Selection Notes

Select based on required repetitive peak blocking voltage and average forward current ratings relative to the operating case temperature. Consider the non-repetitive surge current capabilities and di/dt limits when designing protection circuits. Verify thermal management requirements using the provided transient thermal impedance coefficients and power dissipation curves for the specific conduction angle.

Part Context

The LD43 series comprises Dual SCR Isolated POW-R-BLOK modules rated for 500 Amperes and voltages from 800 to 1600 Volts. These modules are designed for high-power industrial applications requiring phase control. The LD431650 specifically denotes the 1600 Volt variant within this family, sharing the same physical outline and general electrical characteristics as other voltage-rated versions in the series.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided datasheet. Cross-referencing requires matching dual SCR configuration, isolation voltage, current ratings, and mechanical dimensions.