BC638

Single Bipolar Transistors Overview

The onsemi BC638 is a PNP silicon epitaxial planar transistor designed for general-purpose amplification and switching applications. It features a maximum collector current of 1 A, a collector-emitter voltage rating of -60 V, and a collector-base voltage of -30 V. The device operates within a junction temperature range of -55°C to +150°C and dissipates up to 1 W of power. Key electrical characteristics include a minimum DC current gain (hFE) of 25 and a transition frequency (fT) of 50 MHz. It is housed in a TO-92 three-lead through-hole package.

Single Bipolar Transistors Feature Summary

• Utilizes silicon epitaxial planar technology for reliable performance
• Provides high current handling capability suitable for power switching
• Features low saturation voltage for efficient operation
• Designed with robust thermal stability for extended temperature ranges

Single Bipolar Transistors Applications

• General-purpose amplifier circuits
• Power switching applications
• Driver stages for relays and motors
• Audio output stages

Single Bipolar Transistors Procurement Notes

Verify the specific suffix against official datasheets to confirm exact binning or packaging variations. Ensure the component meets RoHS compliance requirements if mandated by the design specifications. Cross-reference the manufacturer part number with authorized distributor catalogs to confirm active status and availability before finalizing procurement plans.

Single Bipolar Transistors Selection Notes

Select this component when a PNP transistor with 1 A continuous current capacity and 60 V breakdown voltage is required. Consider the TO-92 package constraints regarding thermal dissipation limits. Evaluate the hFE gain requirements against the circuit's base drive capabilities to ensure proper saturation during switching operations.

Single Bipolar Transistors Part Context

This component belongs to the BC638 series of bipolar junction transistors manufactured by onsemi. The series includes complementary NPN variants such as the BC639. These devices are widely utilized in consumer electronics and industrial control systems where standard discrete switching and amplification functions are needed.

Single Bipolar Transistors Replacement Considerations

• BC639 (Complementary NPN variant)
• BC558 (Similar PNP specification)