Dual NPN in a SOT-363 — AEC-Q101 from the start
The Infineon BC846SE6327 is a dual NPN transistor in a single SOT-363 package, qualified to AEC-Q101 for automotive and industrial applications. Each transistor is rated for a 65V collector-emitter breakdown and 100mA continuous collector current, with a 250MHz transition frequency that covers general-purpose switching and amplification up to a few MHz.
The 65V Vceo breakdown gives headroom on 24V and 48V rails common in automotive and industrial systems — a 40V-rated transistor would be marginal for a 48V bus with transients. The 250MHz fT is typical for a general-purpose signal transistor; it handles gate-drive pulse trains, level shifting, and analog pre-amplifier stages cleanly, but it is not a high-speed RF device. Minimum DC current gain of 200 at 2mA collector current means the gain stays consistent at low drive levels, which helps in current-mirror and differential-pair designs where matching matters.
SOT-363 dual — board-area saving and thermal sharing
Two NPN transistors in the same SOT-363 package replace two SOT-23s, saving about 40% board area. The shared substrate means the two die track temperature together — useful when they form a differential pair or current mirror. Maximum power dissipation is 250mW for the combined device, so per-transistor dissipation should stay under 125mW in continuous operation. The SOT-363 footprint is standard across the BC846/BC847/BC848 dual families, making it a drop-in for existing layouts.