onsemi NPN Bipolar Transistor, 500 mA Collector Current, 45 V Collector-Emitter Voltage, 3-Pin SOT-23 BC817-40LT3G

The onsemi BC817-40LT3G is a NPN bipolar transistor housed in a compact 3-pin SOT-23 surface mount package designed for efficient linear and switching applications in electronic circuits. It features a maximum DC collector current of 500 mA and a maximum collector-emitter voltage rating of 45 V, making it suitable for a wide range of medium power applications. The transistor’s high transition frequency of 100 MHz allows for high-speed switching performance in various electronic designs.

Its typical minimum current gain (hFE) is 40, ensuring steady gain for amplification purposes. The transistor supports a maximum power dissipation of 300 mW, suitable for moderate thermal environments. It operates reliably within a wide temperature range from -65°C to 150°C, making it appropriate for use in demanding industrial, commercial, and consumer electronics environments.

The compact SOT-23 package measuring approximately 3.4 mm in length, 2.64 mm in width, and 1.1 mm in height is optimized for surface mounting on printed circuit boards (PCBs), enabling efficient board layouts and automated assembly processes. Its NPN polarity configuration adapts easily to typical transistor applications including switching, amplification, and protective circuits.

This transistor finds common uses in electronic circuit protection such as ESD protection, polarity reversal protection, data line safeguarding, inductive load handling, and steering logic design. The availability of Pb-free packages also supports environmental compliance and green manufacturing standards.

Maximum DC collector current of 500 mA suitable for medium power applications. Collector-emitter voltage rated at 45 V enabling robust switching and amplification. SOT-23 package designed for low power surface mount integration.

High transition frequency of up to 100 MHz allows for high-speed switching. Typical minimum DC current gain (hFE) of 40 ensures efficient amplification. Operating temperature range from -65°C up to 150°C for reliability in varied environments.

Maximum power dissipation of 300 mW supporting moderate thermal loads. NPN polarity transistor configuration for common electronic circuit designs. Package dimensions approximately 3.4 mm length, 2.64 mm width, and 1.1 mm height.

This product is well-suited for industrial, commercial, electronics manufacturing, and laboratory applications requiring reliable signal switching and amplification components. The BC817-40LT3G provides a compact, efficient, and durable solution for high volume production and prototype designs alike.

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