onsemi NPN Bipolar Transistor 500 mA 45 V 3-Pin SOT-23 Surface Mount BC817-40LT1G

onsemi BC817-40LT1G is a high-quality single NPN bipolar transistor designed for linear and switching applications in electronics. It is packaged in a small 3-pin SOT-23 surface mount package that is ideal for compact circuit board layouts where space and weight are critical.

This transistor supports a maximum collector current of 500 mA and can withstand collector-emitter voltages up to 45 V. It also has a maximum collector base voltage of 50 V and emitter base voltage of 5 V, which protects sensitive control circuits and ensures safe operation.

The device exhibits a minimum DC current gain (hFE) of 250 and operates at a transition frequency of 100 MHz, making it suitable for amplification and switching tasks in medium to high frequency ranges.

Power dissipation is rated at 300 mW, enabling reliable performance for low-power electronic applications. With an operating temperature up to 150°C and compliance with automotive AEC-Q101 standard, the BC817-40LT1G can be utilized in rigorous automotive or industrial environments.

The precise package dimensions - length 3.04 mm, height 2.64 mm, and width 1.11 mm - make it compatible with automated surface mount technology assembly processes, enhancing production efficiency.

The transistor is primarily used in protection circuits including ESD protection, polarity reversal protection, and inductive load protection. It also serves in steering logic and data line protection applications, where its switching performance and reliability are critical.

The small footprint and surface mount form factor make it suited for compact consumer electronics, automotive controls, and general electronic component designs. The BC817-40LT1G offers an automotive grade version ensuring enhanced reliability and robustness for vehicle electronics.

Efficient thermal management and power capabilities enable safe and stable operation across a wide temperature range. This transistor belongs to the BC817-40L series and is a trusted choice for engineers designing integrated circuits requiring a dependable NPN transistor solution.

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