BD436S

Overview

The BD436S is a PNP epitaxial silicon transistor from onsemi, designed for general-purpose amplifier applications. It features a low saturation voltage (VCE(sat)) and is qualified to AEC-Q101 automotive standards. The device operates with a maximum collector-emitter voltage of 32V and supports a continuous collector current of 4A. Packaged in TO-126-3, it dissipates up to 36W of power at 25°C case temperature. Key electrical parameters include a transition frequency of 3MHz and a maximum collector cutoff current of 100µA.

Feature Summary

• Automotive-grade reliability through AEC-Q101 qualification
• Low collector-emitter saturation voltage for efficient amplification
• High continuous current capability of 4A in TO-126 package

Applications

• General-purpose circuit designs requiring efficient transistor operation
• Automotive electronic systems demanding reliable NPN/PNP switching
• Amplifier circuits utilizing low VCE(sat) characteristics

Procurement Notes

Verify the specific datasheet revision and manufacturer origin, as the BD436S was originally developed by Fairchild Semiconductor before its acquisition by onsemi. Ensure the component matches the required TO-126-3 package style and confirms AEC-Q101 compliance for automotive integration. Cross-reference part markings against official onsemi documentation to authenticate source and prevent counterfeit substitution.

Selection Notes

Select the BD436S when designing circuits that require a robust PNP transistor with high current handling and automotive certification. Its low saturation voltage makes it suitable for applications prioritizing efficiency in signal amplification. Consider the 32V voltage limit and 4A current capacity to ensure compatibility with system load requirements and thermal management constraints within the TO-126 form factor.

Part Context

This component belongs to the broader family of PNP epitaxial silicon transistors, often grouped with variants like the BD434 and BD438. These devices share similar structural characteristics but differ in specific voltage or current ratings. The BD436S specifically targets applications needing moderate voltage isolation with high current throughput, serving as a standard discrete solution in both industrial and automotive semiconductor portfolios.

Replacement Considerations

Consult official cross-reference lists for equivalents such as the BD434 or BD438 if voltage or current specifications allow. Verify pinout compatibility and thermal resistance values when substituting to maintain circuit integrity and performance levels without redesigning the PCB layout.