81CNQ035A

Overview

The Vishay VS-81CNQ035A is a center tap Schottky rectifier module featuring two independent legs with a common cathode configuration. It provides a maximum average forward current of 40 A per leg (80 A total) and a maximum DC reverse voltage rating of 35 V. The device utilizes the D-61 package style, supporting through-hole mounting. Key electrical characteristics include a maximum forward voltage drop of 0.60 V at 25 °C and a junction temperature range from -55 °C to 175 °C.

Feature Summary

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

Applications

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

Procurement Notes

Verify that the specific part number suffix matches the required package variant, as the datasheet distinguishes between standard leaded (PbF), surface mount (ASM), and low profile (ASL) configurations. Confirm RoHS compliance status by checking for the PbF designation on the ordering information table. Ensure technical requirements align with the industrial level qualification specified in the product description before finalizing procurement.

Selection Notes

Select this component when a dual-leg common cathode topology is required for high-current applications. The 35 V reverse voltage rating suits low-voltage output stages. Consider the thermal resistance values and allowable case temperatures for heatsink design. Verify that the physical dimensions of the D-61 package fit the intended PCB layout or chassis mounting constraints.

Part Context

This device belongs to the VS-81CNQ...A PbF Series, representing a new generation of high-power Schottky rectifiers. The series offers variants with different reverse voltage ratings, specifically 35 V, 40 V, and 45 V options. All models share the same 80 A total current rating and utilize the proprietary barrier technology for improved performance over standard Schottky devices.

Replacement Considerations

Direct substitutes within the same series include the VS-81CNQ040A and VS-81CNQ045A, which maintain identical current and thermal ratings but offer higher reverse voltage capabilities of 40 V and 45 V respectively. These can be used if the circuit design allows for increased voltage headroom.

FAQ

What is the maximum non-repetitive surge current rating?

The maximum peak one-cycle non-repetitive surge current per leg is 4600 A for a 5 μs sine pulse or 3 μs rectangular pulse.

How does the forward voltage drop vary with temperature?

At 40 A, the forward voltage drop decreases from 0.60 V at 25 °C to 0.54 V at 125 °C junction temperature.

Is this component suitable for lead-free soldering processes?

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