BD241-S

Overview

The BD241-S is an NPN silicon power transistor manufactured by Bourns Inc., designed for general-purpose switching and amplification applications. It features a collector-emitter voltage rating of 45 V and supports a continuous collector current of 3 A, with peak current capability up to 4 A. The device is housed in a TO-220 through-hole package, facilitating efficient thermal management. Key electrical characteristics include a maximum DC collector current of 3 A and a collector-base voltage of 60 V. The transistor exhibits a minimum DC current gain (hFE) of 10 at 3 A and 4 V. Power dissipation ratings vary based on case temperature conditions, supporting robust performance in demanding circuit environments.

Feature Summary

• NPN silicon construction optimized for high-current switching and amplification tasks
• TO-220 through-hole package design enables effective heat dissipation for power applications
• Capable of handling continuous collector currents up to 3 A with peak surge support

Applications

• General-purpose power switching circuits
• Amplifier stages requiring moderate current drive
• Complementary use with PNP counterparts in push-pull configurations

Procurement Notes

Verify the specific manufacturer datasheet for the BD241-S to confirm exact thermal resistance values and absolute maximum ratings prior to integration. Ensure that the TO-220 package dimensions align with the target PCB layout and heatsinking requirements. Cross-reference the hFE binning specifications if precise gain matching is required for the application. Confirm compliance with relevant environmental standards such as RoHS if mandated by the end product regulations.

Selection Notes

Select the BD241-S when an NPN transistor with 45 V breakdown and 3 A continuous current capacity is needed in a standard through-hole form factor. Consider its complementary nature with the BD242 series for balanced push-pull designs. Evaluate the thermal performance under expected load conditions to ensure operation within safe junction temperatures. This component is suitable for applications where moderate power handling and reliable switching are prioritized over ultra-low saturation voltages.

Part Context

The BD241-S belongs to the family of bipolar junction transistors offered by Bourns Inc., specifically engineered for power electronics. It serves as the NPN counterpart to devices like the BD242, allowing for matched pairs in linear and switching topologies. The TO-220 package is a standard industry choice for components requiring direct mounting to heatsinks. This part is commonly utilized in industrial control systems, power supplies, and audio amplifier outputs where robustness and availability are critical factors.

Replacement Considerations

Public confirmed substitute part numbers are not explicitly listed in the provided documentation. Designers should consult official Bourns resources or authorized distributors for validated cross-references. When substituting, ensure that the alternative device matches or exceeds the 45 V VCEO, 3 A IC, and TO-220 package constraints. Verify pinout compatibility and thermal characteristics to maintain circuit integrity without redesigning the board layout.