81CNQ040SMS2

Overview

The SMC Diode Solutions 81CNQ040SMS2 is a Schottky rectifier module in the PRM2-SM package. It features a center-tap configuration with one pair of common cathodes. The device supports a maximum DC blocking voltage of 40 V and an average rectified forward current of 80 A per device (40 A per leg). It operates within a junction temperature range of -55°C to +175°C. Key electrical parameters include a typical forward voltage drop of 0.64 V at 80 A and a reverse leakage current of 5 mA at 25°C.

Feature Summary

• Center tap module design for efficient power conversion
• Very low forward voltage drop for high efficiency
• High purity, high temperature epoxy encapsulation for mechanical strength
• Guard ring structure for enhanced ruggedness and long-term reliability

Applications

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

Procurement Notes

Verify the specific ordering suffix 'SMS2' to confirm the PRM2-SM package style and pure tin terminal finish. Ensure the selected variant matches the required thermal resistance and mounting torque specifications for the intended heat sink interface. Cross-reference the datasheet revision to confirm current manufacturing status and availability.

Selection Notes

Select this component for applications requiring a 40 V rating and up to 80 A total current handling in a low-profile through-hole package. Consider the 0.85 °C/W thermal resistance per leg when designing the heatsink interface. Verify that the operating frequency benefits from the low junction capacitance and fast switching characteristics inherent to the Schottky technology.

Part Context

This part belongs to the 81CNQ Series of Schottky rectifiers manufactured by SMC Diode Solutions. The series includes variants with different voltage ratings such as 35 V and 45 V. The 81CNQ040SMS2 specifically utilizes the PRM2-SM case style, distinguishing it from the standard PRM2 and PRM2-SL packages available in the same product line.

Replacement Considerations

Direct substitutes within the same series include the 81CNQ040SM (nickel plated) or 81CNQ040S2 (PRM2 package). Verify pin compatibility and thermal performance when replacing with these variants.

FAQ

What is the peak non-repetitive surge current rating?

The peak one-cycle non-repetitive surge current is 950 A per leg for an 8.3 ms half-sine pulse.

Does the device support avalanche energy?

Yes, the typical non-repetitive avalanche energy is 54 mJ per leg at TJ=25°C with IAS=8A and L=1.7mH.

What is the maximum dv/dt rating?

The maximum voltage rate of change (dv/dt) is 10,000 V/µs.