PNP Darlington for automotive loads
The Infineon BSP61E6327 is a PNP Darlington transistor qualified to AEC-Q101. Collector-emitter breakdown is 60 V, continuous collector current is 1 A, and DC current gain is at least 2000 at 500 mA. Housed in the PG-SOT223 surface-mount package, the part occupies minimal board area while the exposed tab provides a thermal path to the PCB copper pour. Junction temperature is rated to 150°C, consistent with under-hood ambient conditions where local heating from adjacent power devices is expected.
Gain and saturation — what they mean for the drive circuit
Minimum hFE is 2000 at 500 mA and 10 Vce. Vce saturation is 1.8 V maximum at 1 mA base drive and 1 A collector current. Package power limit is 1.5 W.
Transition frequency and switching speed
The 200 MHz transition frequency is typical for a Darlington of this current class. It supports PWM switching up to several tens of kilohertz — adequate for lamp dimming, valve proportional control, or brushed DC motor speed control. For higher-frequency applications like switch-mode power supplies, a single PNP or MOSFET would be a better fit; the Darlington's stored charge in the output stage limits turn-off speed.
Lifecycle and sourcing
The AEC-Q101 qualification means it is released for automotive production lines and subject to the change notification and long-term supply commitments typical of that grade. For BOM freeze or dual-sourcing reviews, the part is available through independent distribution and quoted to order against an RFQ.