81CNQ045A

Overview

The Vishay VS-81CNQ045A is a center tap Schottky rectifier module featuring two common cathode elements. It provides a maximum average forward current of 80 A and supports a maximum DC reverse voltage of 45 V. The device utilizes proprietary barrier technology to ensure reliable operation up to a junction temperature of 175 °C. Electrical characteristics include a typical forward voltage drop of 0.54 V at 40 Apk and 125 °C, with a maximum non-repetitive surge current capability of 4600 A.

Feature Summary

• Center tap configuration optimized for low reverse leakage at elevated temperatures
• Proprietary barrier technology enabling stable operation up to 175 °C junction temperature
• High purity epoxy encapsulation providing enhanced mechanical strength and moisture resistance
• Guard ring design incorporated to improve ruggedness and long-term reliability

Applications

• Switching power supplies
• DC-DC converters
• Freewheeling diodes
• Reverse battery protection circuits

Procurement Notes

Verify the specific package variant required, as the datasheet defines three distinct options: D-61-8 (standard), D-61-8-SM (smaller footprint), and D-61-8-SL (low profile). Confirm that the PbF suffix is present if lead-free compliance is mandatory for the assembly process. Ensure mounting torque specifications are strictly adhered to during installation to maintain thermal performance and mechanical integrity.

Selection Notes

Select this component when high-frequency operation and low forward voltage drop are critical for system efficiency. The 175 °C operating rating allows for reduced heatsinking requirements in high-temperature environments compared to standard 150 °C devices. Verify that the 45 V reverse voltage rating exceeds the peak working voltage of the application circuit to prevent breakdown under transient conditions.

Part Context

This part belongs to the VS-81CNQ...A PbF Series, representing the New Generation 3 D-61 Package family from Vishay High Power Products. The series is designed specifically for industrial level applications requiring robust high-current rectification. The 'A' designation indicates the specific generation of the barrier technology used within the module.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.

FAQ

What is the maximum thermal resistance from junction to case per leg?

The maximum thermal resistance from junction to case per leg is 0.85 °C/W under DC operation.

How does the forward voltage drop change with temperature?

The forward voltage drop decreases as temperature increases; it is specified at 0.60 V at 25 °C and drops to 0.54 V at 125 °C for a 40 A current.

Is the device suitable for lead-free soldering processes?

Yes, through-hole versions with the PbF suffix are designed and qualified for use in lead-free applications and are compliant with RoHS directives.