121NQ040

Overview

The Vishay 121NQ040 is a high-current Schottky rectifier module in the D-67 Half-Pak case style. It features a maximum average forward current of 120 A and a maximum DC reverse voltage of 40 V. The device operates with a junction temperature range from -55°C to 175°C and has a typical thermal resistance from junction to case of 0.40 °C/W. Maximum forward voltage drop is specified at 0.65 V at 120 A, while peak non-repetitive surge current reaches 19,800 A.

Feature Summary

• Optimized for low reverse leakage at high temperatures using proprietary barrier technology
• Designed as a replacement for two parallel DO-5 diodes with a lower profile
• Features guard ring construction for enhanced ruggedness and long-term reliability
• Utilizes high purity, high temperature epoxy encapsulation for mechanical strength

Applications

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

Procurement Notes

Verify the specific suffix (R) against the datasheet to confirm terminal configuration. Ensure mounting surfaces are smooth and greased to achieve the typical thermal resistance value of 0.15 °C/W. Confirm torque specifications match the application requirements before installation.

Selection Notes

Select this component for applications requiring high current handling up to 120 A and operation at elevated junction temperatures up to 175°C. Consider the D-67 package dimensions and mounting requirements compared to standard DO-5 configurations when designing the PCB or heatsink interface.

Part Context

This part belongs to the 121NQ... (R) series of high current Schottky rectifier modules. The series includes variants with different reverse voltage ratings such as 35 V, 45 V, and 50 V, all sharing the same 120 A current rating and Half-Pak module form factor.

Replacement Considerations

STPS2045CT