Dual pre-biased NPN — two switches in a five-pin SC-70
The Toshiba RN1701,LF packs two NPN transistors with integrated bias resistors into an SC-70-5 / SOT-353 package (supplier device package USV). Each transistor has a 4.7 kΩ base resistor (R1) and a 4.7 kΩ emitter-base resistor (R2), so you drop the two external resistors per channel that a standard transistor pair would need. Collector-emitter breakdown is rated 50 V, continuous collector current 100 mA, and the transition frequency hits 250 MHz — fast enough for low-VHF switching and level translation up to a few tens of megahertz.
200 mW total dissipation — signal duty, not power
Total device dissipation is 200 mW. In a SOT-353 footprint that means derating is real — this part handles logic-level loads, relay pre-drive, and sensor interface switching, not output-stage current.