2N4373

Overview

The Powerex Inc. 2N4373 is a silicon NPN power transistor designed for high-voltage, high-current applications. It utilizes a planar epitaxial structure to ensure robust performance and reliability. The device features a TO-204AA (TO-5) metal can package, which facilitates efficient heat dissipation through the case. Key electrical characteristics include a collector-emitter voltage rating of 140V and a continuous collector current capacity of 16A. With a maximum power dissipation of 150W at 25°C ambient temperature, it is suitable for linear and switching operations in demanding environments.

Feature Summary

• Planar epitaxial construction for enhanced structural integrity
• High thermal conductivity metal case for effective heat management
• Robust design supporting high voltage and current levels

Applications

• Linear regulator circuits requiring high current handling
• Industrial motor control systems
• Power supply output stages

Procurement Notes

Verify the specific manufacturer source, as the 2N4373 designation is a generic military-style part number historically produced by multiple vendors including onsemi and others. Confirm that the component supplied matches the required electrical specifications and physical dimensions. Check for RoHS compliance status if applicable to your assembly process. Ensure the package type corresponds to standard TO-204AA mounting requirements.

Selection Notes

Select this component when a high-current NPN transistor with moderate voltage ratings is needed. Compare the thermal resistance values against your heatsinking capabilities. Verify the gain bandwidth product meets your frequency requirements if used in amplification roles. Consider the package mounting style for PCB or chassis integration.

Part Context

The 2N4373 belongs to the family of general-purpose power transistors often used in industrial and commercial power electronics. While originally defined by military standards, it is widely available from various semiconductor manufacturers. It serves as a fundamental building block for power amplification and regulation tasks where silicon NPN technology offers the best balance of cost and performance.

Replacement Considerations

Check datasheets for equivalent parts such as the 2N3773 or similar TO-5 packaged NPN transistors. Ensure pinout compatibility and verify that voltage, current, and power dissipation ratings meet or exceed the original design requirements.