121NQ035

Overview

The Vishay 121NQ035 is a high-current Schottky rectifier module in the D-67 Half-Pak case style. It features a maximum DC reverse voltage of 35 V and an average forward current rating of 120 A at a rectangular waveform with a 50% duty cycle. The device supports junction temperatures from -55 °C to 175 °C, with a maximum thermal resistance from junction to case of 0.40 °C/W. Key electrical characteristics include a maximum forward voltage drop of 0.65 V at 120 A and a peak non-repetitive surge current capability of 19,800 A for a 5 µs sine pulse.

Feature Summary

• Optimized proprietary barrier technology ensures reliable operation up to 175 °C junction temperature with low reverse leakage at high temperatures.
• High purity, high temperature epoxy encapsulation provides enhanced mechanical strength and moisture resistance.
• Guard ring design enhances ruggedness and long-term reliability.
• Half-Pak module configuration offers easier mounting and a lower profile compared to parallel DO-5 configurations.

Applications

• Switching power supplies
• Converters
• Free-wheeling diodes
• Reverse battery protection

Procurement Notes

Verify the specific part number suffix against official documentation to confirm exact ratings and packaging. Confirm that the procurement source provides original manufacturer datasheets or authorized distributor certificates. Ensure compliance with industrial level qualification standards required for the intended application environment.

Selection Notes

Select this component when high current handling and elevated temperature stability are critical requirements. The Half-Pak package facilitates efficient heat dissipation through direct heatsink mounting. Evaluate the thermal resistance parameters to ensure adequate cooling solutions are implemented for sustained 120 A operation.

Part Context

This component belongs to the 121NQ... (R) series of high current Schottky rectifiers designed for industrial applications. The series utilizes unique barrier technology to minimize reverse leakage while maintaining low forward voltage drops. The D-67 Half-Pak module serves as a robust alternative to discrete parallel diode arrangements.

Replacement Considerations

The datasheet indicates the module replaces two parallel DO-5 diodes. Verify physical footprint compatibility and thermal interface requirements when substituting existing designs.