Automotive-grade pre-biased PNP — the base-resistor pair defines the on-threshold
The RN2115,LXHF(CT is a PNP pre-biased transistor from Toshiba, rated for 50 V collector-emitter breakdown and 100 mA continuous collector current. The integrated bias network — 2.2 kOhms on the base leg (R1) and 10 kOhms on the emitter-base leg (R2) — sets the turn-on threshold and eliminates two external resistors from the BOM. The 100 mW power dissipation ceiling in the SC-75 package limits continuous duty, but the 200 MHz transition frequency keeps switching edges clean for low-speed solenoid and relay drivers.
Package and footprint — SC-75 SOT-416 with SSM marking
The SC-75 / SOT-416 package (Toshiba's SSM supplier device package) is a three-lead surface-mount outline roughly 1.6 x 1.6 mm with a 0.95 mm pin pitch.
The RN2115,LXHF(CT is the automotive-grade variant of the base RN2115 die; the LXHF suffix denotes the SC-75 package and automotive qualification. The closest peer, RN2115,LF(CT, shares the same electrical ratings but lacks the AEC-Q101 certification — a BOM swap requires confirming the temperature-grade requirement before committing.
