BUT12A

Single Bipolar Transistors Overview

The Fairchild Semiconductor BUT12A is a high-voltage NPN silicon power transistor designed for switching applications. It features a collector-base voltage rating of 1000V and a continuous collector current of 8A. The device dissipates 100W of power at a case temperature of 25°C. Packaged in a TO-220AB through-hole housing with three pins, it serves as a robust component for high-speed switching circuits requiring significant voltage isolation and current handling capabilities.

Single Bipolar Transistors Feature Summary

• High-voltage capability suitable for demanding switching environments
• High-speed switching performance optimized for power circuits
• Robust thermal dissipation within a standard metal envelope package

Single Bipolar Transistors Applications

• High-voltage power switching circuits
• Industrial power supply designs
• Motor control systems

Single Bipolar Transistors Procurement Notes

Verify the obsolete status of this component before procurement, as Fairchild Semiconductor has discontinued production. Confirm availability from authorized distributors or surplus suppliers. Ensure the specific lot date codes meet project requirements due to potential age-related degradation. Cross-reference datasheet revisions to confirm electrical characteristics match design specifications. Validate packaging integrity upon receipt to prevent damage to the TO-220 leads.

Single Bipolar Transistors Selection Notes

Select the BUT12A when designing circuits requiring high voltage blocking and moderate current switching. Consider its 1000V rating for primary side applications in isolated converters. Evaluate thermal management needs given the 100W dissipation limit. Compare against modern replacements if long-term supply stability is critical. Ensure the TO-220 footprint aligns with existing board layout constraints.

Single Bipolar Transistors Part Context

This component belongs to the BUT12 series of high-voltage NPN transistors manufactured by Fairchild Semiconductor. The series targets general-purpose high-power switching tasks. The BUT12A variant specifically denotes the 1000V rating configuration within this family. These devices were widely used in legacy power electronics before newer technologies emerged.

Single Bipolar Transistors Replacement Considerations

Public confirmed substitute part numbers are not provided in the available documentation. Due to the obsolete status, direct pin-compatible replacements should be verified against updated manufacturer catalogs or equivalent high-voltage NPN transistors with matching Vceo and Ic ratings.