81CNQ035SMS2

Overview

The 81CNQ035SMS2 is a Schottky rectifier diode array from the 81CNQ series, manufactured by SMC Diode Solutions. It features a common cathode configuration with two elements housed in a PRM2-SM through-hole package. The device supports a maximum repetitive reverse voltage of 35 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 specifications include a typical forward voltage drop of 0.64 V at 80 A and a maximum reverse leakage current of 5 mA at 25°C.

Feature Summary

• Center tap module design for efficient power conversion
• Very low forward voltage drop to minimize conduction losses
• High purity, high temperature epoxy encapsulation for mechanical strength and moisture resistance
• 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 indicates pure tin dipped terminals rather than nickel plated finishes when sourcing replacements. Confirm the PRM2-SM package dimensions match the target PCB footprint. Ensure thermal management solutions account for the specified junction-to-case thermal resistance values under DC operation conditions.

Selection Notes

Select this component for applications requiring high current handling in a low-profile through-hole package. The 35 V rating suits low-voltage output stages. Consider the 175°C junction temperature capability for high-temperature environments. Evaluate the forward voltage characteristics against efficiency requirements compared to standard silicon rectifiers.

Part Context

This part belongs to the 81CNQ series of Schottky rectifiers designed for general-purpose power applications. The series offers various voltage ratings and packaging options, including PRM2, PRM2-SL, and PRM2-SM cases. The manufacturer emphasizes traceability to the wafer lot and compliance with RoHS3 standards for environmental safety.

Replacement Considerations

Direct substitutes within the same series include 81CNQ035SM (nickel plated) or 81CNQ035S2 (PRM2 case). Cross-manufacturer equivalents must match the 35 V reverse voltage, 80 A current rating, and PRM2-SM package form factor.

FAQ

What is the difference between the PRM2-SM and PRM2 packages?

The PRM2-SM package is a specific variant of the PRM2 case style, distinguished by its terminal finish and physical mounting characteristics as defined in the mechanical dimensions section of the datasheet.

Does the 81CNQ035SMS2 support avalanche energy ratings?

Yes, the datasheet specifies a non-repetitive avalanche energy rating of 54 mJ per leg at TJ=25°C with an avalanche current of 8 A.

What is the typical thermal resistance from junction to case?

The typical thermal resistance from junction to case is 0.85 °C/W per leg and 0.42 °C/W per package under DC operation conditions.