The Infineon BCR116WE6327BTSA1 is an NPN pre-biased digital transistor in a SC-70 / SOT-323 package, integrating a 4.7 kΩ series base resistor (R1) and a 47 kΩ resistor (R2) between base and emitter. This built-in bias network eliminates two external resistors per channel, saving board area in high-density designs like relay drivers, logic-level translators, and low-current load switches. The transition frequency of 150 MHz is adequate for switching up to several megahertz.
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The built-in 4.7 kΩ base resistor sets the base current for a given drive voltage — at 3.3 V logic, base current is roughly (3.3 V – 0.7 V) / 4.7 kΩ ≈ 550 µA, which with a minimum DC current gain of 70 at 5 mA collector current gives plenty of drive headroom for switching a 10 mA load. The 47 kΩ emitter-base resistor ensures the transistor is held off when the base drive is open or high-impedance, which is useful in mixed-voltage or power-sequencing applications. Vce(sat) of 300 mV max at 10 mA collector current keeps conduction losses low in saturated switching. The 250 mW power dissipation limit in the SOT-323 package means derating is needed above about 85 °C ambient if running near the full 100 mA.