BD249A-S

Overview

The BD249A-S is a silicon NPN power transistor manufactured by Bourns Inc. It features a maximum collector-emitter breakdown voltage of 60 V and a continuous collector current rating of 25 A. The device operates within a junction temperature range of -65°C to 150°C. Electrical characteristics include a Vce saturation voltage specified at 4V when the collector current is 5A. Thermal management requires linear derating of 1 W/°C starting from a case temperature of 150°C, with specific pulse parameters applying for durations up to 0.3 ms and duty cycles not exceeding 10%.

Feature Summary

• NPN bipolar junction transistor configuration designed for high-current power applications.
• Capable of handling continuous collector currents up to 25 amperes.
• Operates reliably across an extended junction temperature range from -65°C to 150°C.

Applications

• Power switching circuits requiring high current capacity.
• Amplifier stages in audio or industrial equipment.
• General-purpose power control systems.

Procurement Notes

Verify component authenticity through authorized Bourns distributors or certified supply chain partners. Confirm that the received units match the BD249A-S designation and exhibit no physical damage. Check datasheet revisions for any updates to electrical limits or thermal derating curves. Ensure storage conditions comply with moisture sensitivity levels if applicable. Request batch-specific documentation to validate compliance with RoHS3 standards and material declarations prior to integration into final assemblies.

Selection Notes

Select this component when circuit requirements demand an NPN transistor with a 60 V breakdown voltage and 25 A continuous current capability. Evaluate thermal dissipation needs based on the 1 W/°C derating rate and 150°C case temperature limit. Consider the Vce saturation characteristic at 5 A for efficiency calculations in switching applications. Ensure the operating environment stays within the -65°C to 150°C junction temperature range. Verify package compatibility and pinout alignment with existing PCB layouts before procurement.

Part Context

The BD249A-S belongs to Bourns' portfolio of bipolar junction transistors (BJTs). It serves as a discrete semiconductor device intended for power handling roles. The product line emphasizes robust construction for industrial and commercial electronics. This specific model represents a standard NPN power transistor variant within the manufacturer's catalog, distinct from their resistor, fuse, or sensor offerings.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source data. Cross-reference with other manufacturers' NPN power transistors having equivalent 60 V, 25 A ratings only after verifying pinout and thermal characteristics match the original design requirements.