Complementary pair in one tiny package
The HN1B01FU-Y,LXHF packs an NPN and a PNP transistor into a single SOT-363 (US6) package — 150 mA collector current each, 50 V collector-emitter breakdown. That covers a lot of small-signal switching and pre-driver chores in automotive modules where board space is tight and you want one BOM line instead of two. AEC-Q101 qualification (Grade Automotive) means the part is screened for the -40 to +125 °C ambient range typical of under-hood and chassis-mount electronics — not a commodity general-purpose transistor.
Saturation and gain — what the numbers mean for your design
Vce(sat) is 300 mV max for the NPN and 250 mV max for the PNP at 10 mA base / 100 mA collector — that is a solid saturated switch at moderate load. Transition frequency is 120 MHz (NPN) and 150 MHz (PNP) — fine for PWM up to a few hundred kHz or linear amplification below 10 MHz. Not an RF part, but adequate for gate-drive buffering, relay coil kickback clamping, and sensor output conditioning.
SOT-363 (also called SC-88 or US6) is a 6-lead surface-mount package with a 1.25 mm body width and 0.65 mm lead pitch. The footprint is standard — reflow profiles for this package are well-documented, and the low 200 mW power dissipation means no special thermal management is needed on a typical FR4 board.
Active lifecycle — sourcing posture
Listed as Active by Toshiba Semiconductor.