BD545-S

Overview

The BD545-S is an NPN bipolar junction transistor manufactured by Bourns Inc., designed for through-hole mounting in the TO-218-3 package. It features a collector-emitter breakdown voltage of 40 V and supports a continuous collector current of 15 A. The device offers a maximum power dissipation of 85 W, enabling robust performance in high-current applications. Key electrical characteristics include a minimum DC current gain of 10 at 10 A with a base current of 10 A, and a collector-emitter saturation voltage of 1 V at 2 A base current and 10 A collector current. The emitter-base reverse voltage is rated at 5 V, and it operates within a temperature range of -65°C to +150°C.

Feature Summary

• NPN bipolar junction transistor configuration for switching and amplification
• High current handling capability up to 15 A
• Robust thermal management with 85 W power dissipation rating
• Wide operating temperature range suitable for demanding environments

Applications

• Power supply circuits requiring high current switching
• Audio amplifier output stages
• Industrial motor control systems
• General-purpose high-power switching applications

Procurement Notes

Verify the specific datasheet version from Bourns Inc. to confirm exact electrical parameters and mechanical dimensions. Ensure the TO-218-3 package matches your PCB footprint requirements. Cross-reference the part number BD545-S with authorized distributors to confirm authenticity and traceability. Check for any recent updates to the product specifications or compliance certifications before finalizing procurement decisions.

Selection Notes

Select the BD545-S when high collector current and power dissipation are required in a through-hole NPN transistor application. Consider the 40 V breakdown voltage limit for circuit design constraints. Evaluate the thermal resistance and heat sinking requirements due to the 85 W power rating. Compare the saturation voltage characteristics against other options if low voltage drop is critical for efficiency.

Part Context

The BD545-S belongs to Bourns Inc.'s lineup of single bipolar transistors, specifically designed for high-power applications. It complements other components in their discrete semiconductor portfolio, offering reliable performance in industrial and consumer electronics. The TO-218-3 package provides a balance between power handling and ease of integration into traditional through-hole designs.

Replacement Considerations

Consult official substitution guides or manufacturer cross-reference lists for verified equivalent parts. Ensure any replacement maintains compatibility with the 40 V, 15 A, and 85 W specifications. Verify that the alternative component uses the same TO-218-3 package and pinout configuration to avoid redesign efforts.