Pre-biased PNP switch — built-in resistors save board space
The Toshiba RN2402,LF is a PNP pre-biased transistor in a surface-mount S-Mini (SOT-23-3) package. It integrates two 10 kΩ resistors — one in series with the base (R1) and one between base and emitter (R2) — eliminating the need for external bias components in low-side switching and interface circuits. Collector-emitter breakdown is rated at 50 V, continuous collector current at 100 mA, and the transition frequency reaches 200 MHz.
50 V, 100 mA — where it fits the BOM
The 50 V VCEO and 100 mA Ic(max) cover most 12 V and 24 V logic-level loads: relay coils, small solenoids, LED strings, and level shifting. The 200 MHz fT means switching losses stay low well into the low-MHz range.
For a pre-biased PNP in the SOT-23-3 footprint, this part is a straightforward BOM line to qualify into production without obsolescence watch.