Dual pre-biased transistor in one SC-74 package
The Toshiba RN4609(TE85L,F) packs one NPN and one PNP pre-biased transistor into a single SC-74 (SOT-457) surface-mount package. Each transistor includes a 47 kΩ series base resistor and a 22 kΩ base-emitter resistor, eliminating the two external bias resistors normally needed per device. This cuts component count and board area in half for complementary switching stages, level shifters, and small-signal driver circuits.
50 V / 100 mA — what it handles
The 300 mW total power dissipation limits current at higher voltages. The 200 MHz transition frequency keeps switching clean for PWM up to a few megahertz.
Saturation and gain at working currents
VCE(sat) is 300 mV maximum at 250 µA base drive into 5 mA collector current — a tight saturation that keeps on-state voltage drop low in switching applications. Collector cutoff leakage is 100 nA maximum, negligible for most designs.