Dual PNP with integrated bias resistors — a space-saving switch for automotive loads
The Infineon BCR169S packs two PNP pre-biased transistors into a single SOT-363 package, each with a 4.7 kΩ base resistor (R1) integrated on-chip. This eliminates two external resistors per channel, shrinking the footprint for switched loads like solenoid drivers, relay coils, or logic-level interface buffers in automotive body electronics. Each transistor is rated for a collector-emitter breakdown voltage of 50 V and a continuous collector current of 100 mA, with a transition frequency of 200 MHz. The 250 mW total power dissipation (package-limited) sets the thermal ceiling for both channels combined. AEC-Q101 qualification means this part has passed the automotive stress tests for discrete semiconductors — HTRB, temperature cycling, and humidity bias — making it suitable for under-hood and cabin modules where reliability is audited.
PG-SOT363-6-1 — footprint and assembly fit
The supplier device package is PG-SOT363-6-1, a standard 6-pin SOT-363 (SC-88) surface-mount package. The small pad geometry means the stencil aperture and solder paste volume need tuning to avoid open joints. The dual-transistor layout shares the collector on pins 1, 3, 4, and 6 (typical SOT-363 pinout for this topology). Verify the specific pin assignment against the datasheet before committing the PCB layout — the integrated base resistors tie the base to the emitter on each die, so the bias network is fixed.