2N657

Single Bipolar Transistors Overview

The Microchip Technology 2N657 is a single NPN silicon planar bipolar junction transistor designed for medium-power, fast-switching applications. It operates with a maximum collector-emitter voltage of 100V and a continuous collector current of 0.5A. The device features a minimum DC current gain (hFE) of 500 and a transition frequency (fT) of 10 MHz. Maximum power dissipation is rated at 4W in the TO-5-3 package or 1W in the TO-39 package. The component supports an operating temperature range from -65°C to 200°C.

Single Bipolar Transistors Feature Summary

• Optimized current gain for high-power applications
• Fast switching capability suitable for servo amplifiers
• Silicon planar construction for reliability

Single Bipolar Transistors Applications

• Servo amplifier circuits
• Medium power switching applications
• High-power general-purpose amplification

Single Bipolar Transistors Procurement Notes

Verify the specific manufacturer source, as the 2N657 designation is used by multiple vendors including Microchip, Continental Device India, and others. Confirm the package type (TO-5-3 vs TO-39) and thermal dissipation rating required for your design. Ensure compliance with RoHS standards if applicable, as older variants may not be compliant. Cross-reference datasheets from authorized distributors to confirm electrical parameters match your system requirements before procurement.

Single Bipolar Transistors Selection Notes

Select this component when a high-gain NPN transistor is needed for fast switching in medium-power environments. The choice between TO-5-3 and TO-39 packages depends on the available board space and thermal management strategy. Consider the 100V breakdown voltage and 0.5A current limit to ensure adequate headroom for the load. Verify that the hFE minimum of 500 meets the drive requirements of the preceding stage in the circuit design.

Single Bipolar Transistors Part Context

The 2N657 belongs to the family of single NPN silicon planar transistors intended for robust performance in demanding electronic systems. It serves as a discrete power device often utilized in industrial control and audio applications where linear amplification and rapid response are critical. The part is distinct from complementary pairs, focusing solely on NPN functionality for specific circuit topologies requiring unidirectional high-gain amplification.

Single Bipolar Transistors Replacement Considerations

Direct substitutes include other manufacturers' versions of the 2N657 specification, such as those from Continental Device India Limited or New Jersey Semi-Conductor Products. When replacing, ensure the alternative matches the original package style and thermal characteristics. Generic equivalents like the 2N6577 differ significantly in current handling and configuration and are not direct replacements.