The Infineon BCR169WE6327HTSA1 is a PNP pre-biased transistor in a SC-70 / SOT-323 package. It integrates bias resistors (4.7 kOhms base resistor R1) so the base drive network is built in, saving two external resistors per transistor on the board. Rated for 50 V collector-emitter breakdown and 100 mA continuous collector current, it handles low-power switching and signal conditioning in applications like relay drivers, LED indicators, and logic-level interface circuits.
50 V breakdown, 100 mA Ic — the switching envelope
The 50 V Vce(max) and 100 mA Ic(max) define the load it can switch: small relays, optocoupler LEDs, or a logic-level load on a 24 V industrial bus. Saturation voltage is 300 mV at 500 µA base drive and 10 mA collector current, which keeps dissipation low in saturated switching. DC current gain (hFE) is a minimum of 120 at 5 mA, so the integrated base resistor delivers enough drive for most low-current loads without an external transistor stage.
Infineon lists the BCR169WE6327HTSA1 as obsolete. Verify date-code provenance on any lots surfacing after the last-time-buy window; the SOT-323 package is common enough that a cross-ship from surplus stock is realistic, but counterfeit risk rises with age.