2N5666S

Overview

The Microchip Technology 2N5666S is an NPN silicon power bipolar junction transistor designed for high-voltage switching applications. It features a maximum collector-emitter voltage of 300 V and a continuous collector current rating of 5 A. The device is housed in a TO-66 metal can package with a flange mount configuration, facilitating efficient heat dissipation. Key electrical characteristics include a minimum DC current gain (hFE) of 25 and a maximum power dissipation of 52 W at 25°C ambient temperature. The component is qualified to MIL-PRF-19500/455 standards.

Feature Summary

• High voltage capability with 300 V collector-emitter breakdown
• Robust current handling with 5 A continuous collector current
• Military-grade reliability through MIL-PRF-19500/455 qualification
• Efficient thermal management via TO-66 metal flange mount package

Applications

• High-voltage power switching circuits
• Industrial control systems requiring robust NPN transistors
• Aerospace and defense electronic assemblies
• General purpose power amplification stages

Procurement Notes

Verify the specific ordering suffix (e.g., JANTXV, JANS) against the required radiation hardness or quality level, as these designations dictate the manufacturing lot and testing criteria. Confirm that the TO-66 package dimensions match the mechanical constraints of the target assembly. Ensure compliance with relevant military specifications if the application demands strict adherence to MIL-PRF-19500/455 standards for environmental stability.

Selection Notes

Select the 2N5666S when a high-voltage NPN transistor capable of handling 5 A currents is required in a hermetically sealed metal package. Consider this component for designs needing superior thermal conductivity compared to plastic packages. Evaluate the minimum hFE of 25 to ensure adequate base drive current is available for saturation in switching applications. Compare against lower voltage variants like the 2N5666 if 300 V ratings exceed system requirements.

Part Context

The 2N5666S belongs to a family of NPN power transistors manufactured by Microchip Technology under the former Microsemi brand. This series includes variants such as the 2N5664, 2N5665, and 2N5667, which share similar structural characteristics but differ in voltage and current ratings. The TO-66 package is a standard form factor for high-reliability discrete semiconductors used in demanding environments.

Replacement Considerations

Direct substitutes within the same qualification class include the 2N5667 and 2N5666U3. For non-military grade equivalents, verify compatibility with the standard 2N5666 part number, noting potential differences in testing levels. Ensure any replacement maintains the TO-66 footprint and NPN polarity.