The Toshiba RN1904FE,LXHF(CT is a dual NPN pre-biased transistor in the Automotive, AEC-Q101 series. Each transistor integrates a 47 kΩ base resistor and a 47 kΩ emitter-base resistor, eliminating the need for external bias components.
Built-in bias network saves board space
With R1 and R2 both at 47 kΩ, the RN1904FE is a 1:1 bias ratio part — the base current is set by the input voltage and the 47 kΩ base resistor, while the emitter-base resistor provides a turn-off path. This integrated bias cuts two external resistors per transistor, saving four components in a dual package. In an automotive ECU or body-control module where every mm² counts, that is a measurable BOM consolidation.
For volume or spot requirements, the part is sourced to order — no minimum commitment, no forced LTB math.