The Infineon BCR141SE6327BTSA1 is a dual NPN pre-biased transistor in a SOT-363 package, integrating two NPN transistors each with a 22kΩ base resistor (R1) and a 22kΩ emitter-base resistor (R2). This internal bias network eliminates two external resistors per transistor, saving board space and reducing component count in switching and driver applications. Typical uses include relay drivers, logic-level interface circuits, and low-current loads where the 50V collector-emitter breakdown and 100mA collector current rating provide adequate headroom for 12V or 24V industrial logic rails.
The 50V VCEO breakdown and 100mA continuous collector current define the safe operating area for switching loads like small relays, LEDs, or logic-level signals. The 130MHz transition frequency is sufficient for low-speed switching up to a few megahertz, typical for GPIO-driven loads or sensor interfaces. Saturation voltage is specified at 300mV maximum at 500µA base current and 10mA collector current, which keeps on-state dissipation low in a saturated switch. The 250mW power limit in the SOT-363 package means derating is needed if both transistors conduct simultaneously near their maximum current.
Package and reflow considerations
The SOT-363 (SC-88) footprint is a standard small-outline package for dual transistors, compatible with most pick-and-place machines. The surface-mount package requires no special thermal pad; heat is dissipated through the leads and PCB copper.
Lifecycle status and sourcing reality
Infineon lists the BCR141SE6327BTSA1 as obsolete. For existing BOM lines, this means last-time-buy windows have closed and new production is no longer available from the factory. If you need a drop-in alternative, the base product number BCR141S shares the same silicon but may have a different suffix for packaging or lead-free finish—verify pin compatibility and electrical specs against your design before substituting.