BD441

Overview

The onsemi BD441 is a PNP silicon bipolar junction transistor (BJT) designed for medium-power applications. It features a maximum DC collector current of 4 A and a collector-emitter voltage rating of 80 V. The device offers a power dissipation capacity of 36 W at 25°C, with a gain-bandwidth product of 3 MHz. It operates within a temperature range of -55°C to +150°C and is housed in a TO-225AB (TO-220) through-hole package.

Feature Summary

• High current handling capability suitable for power switching and amplification tasks
• Robust thermal performance with high power dissipation rating
• Wide operating temperature range for demanding environments

Applications

• Audio amplifier output stages
• Power supply regulation circuits
• Motor driver interfaces

Procurement Notes

Verify the specific suffix code against the manufacturer datasheet to confirm exact electrical tolerances and packaging options. Ensure the procurement source provides valid RoHS compliance documentation. Confirm that the component matches the required TO-225AB package dimensions for PCB integration.

Selection Notes

Select this component when a PNP configuration is required for high-current loads up to 4 A. Compare the 80 V breakdown voltage against circuit requirements. Consider the thermal resistance characteristics if heatsinking is necessary for continuous operation near the 36 W limit.

Part Context

The BD441 belongs to the BD4xx series of complementary PNP transistors, often paired with NPN counterparts like the BD439. This family is widely used in linear and switching applications requiring reliable medium-power performance from a single discrete component.

Replacement Considerations

Check for direct cross-reference part numbers such as the BD441G or equivalent PNP devices with matching 4A/80V ratings. Verify pinout compatibility and thermal pad specifications before substitution.