The Infineon BCR141WE6327HTSA1 is an NPN pre-biased transistor in a surface-mount SC-70 (SOT-323) package. It integrates two 22 kOhm resistors — one in series with the base, one between base and emitter — eliminating the need for external bias components in switching and driver applications.
The 100 mA maximum collector current (Ic) and 50 V collector-emitter breakdown voltage define the load envelope — this transistor handles small relays, LEDs, and logic-level loads, not power switching. The 250 mW power dissipation limit in the SOT-323 package means derating is necessary above room temperature; at 85 °C ambient, the available power drops to roughly half. The 130 MHz transition frequency is adequate for switching up to low-MHz rates, typical for GPIO-driven loads rather than high-speed PWM. The pre-biased configuration with two 22 kOhm resistors simplifies the BOM by removing two discrete resistors per transistor. The 300 mV saturation voltage at 500 µA base current and 10 mA collector current ensures low on-state losses for lightly loaded outputs.
Obsolete — sourcing reality for sustainment programs
Infineon has marked the BCR141WE6327HTSA1 as Obsolete. For sustainment of existing designs, procurement must rely on the independent distribution channel — new-old-stock and surplus inventory.