Dual NPN pre-biased pair — 50 V, 100 mA, 250 MHz
The Toshiba RN1511(TE85L,F) is a dual NPN pre-biased transistor in an emitter-coupled configuration, housed in an SC-74A (SOT-753) SMV surface-mount package. The 250 MHz transition frequency supports moderate-speed switching applications.
300 mW power — thermal budget for the SMV footprint
The 300 mW maximum power dissipation sets the thermal ceiling for this compact SC-74A package. In continuous operation at 25 °C ambient, the combined dissipation of both transistors must stay under this limit. For a typical 5 V rail switching 50 mA per side, the total power stays well within margin; higher duty cycles or elevated ambient temperatures require derating per the datasheet curve. The SMV footprint (SOT-753 variant) is a common 5-pin layout shared with many small-signal transistors, making PCB layout straightforward.
Active lifecycle — no obsolescence flag
It is RoHS compliant per the listing. For production BOMs, this means no near-term sourcing risk from obsolescence.