Pre-biased PNP — one part replaces a resistor pair
The Toshiba RN2110,LF(CT is a PNP pre-biased transistor that integrates a 4.7 kOhm base resistor (R1) in a single SC-75 package. That means one SOT-416 footprint replaces the transistor plus the external bias resistor — saving board area and reducing pick-and-place count on low-side driver or logic-level switch circuits. The 100 nA max collector cutoff keeps leakage negligible in battery-powered or high-impedance nodes.
Switching and drive — what the ratings mean on the bench
The 200 MHz transition frequency means it switches cleanly at low-to-moderate speeds; expect rise/fall times in the tens of nanoseconds into a light load. Vce saturation is specified at 300 mV max with 250 µA base current driving 5 mA collector current — a low drop that keeps power dissipation under 100 mW in the SC-75 package. For higher collector currents the saturation voltage rises; the 100 mW power limit is the binding constraint, not the current rating alone.
Package and board-fit — SC-75 (SOT-416) in SSM
The SC-75 package (SOT-416, supplier code SSM) is a three-lead surface-mount package roughly 1.6 mm × 0.8 mm — smaller than an SOT-23 but larger than a leadless DFN. The collector is the centre pin; the base and emitter are the outer pins. Standard reflow profiles for lead-free solder apply; the package is compatible with both reflow and wave solder processes. CT works for prototype or low-volume builds. The reel quantity is not stated here but is typically 3,000 or 10,000 pieces per reel for this package size.