22 kOhm base network — predictable turn-on without external resistors
The RN1103MFV,L3F integrates a 22 kOhm base resistor (R1) and a 22 kOhm emitter-base resistor (R2) in a single SOT-723 package, so the transistor switches on at a fixed input voltage threshold without requiring external biasing components. With a 100 mA maximum collector current and a 50 V collector-emitter breakdown voltage, this part is sized for signal-level loads — relay coils, LED drivers, or logic-level interface circuits — not for power switching. The 150 mW power dissipation limit in the SOT-723 package means the continuous collector current must be derated at elevated ambient temperatures; at 100 mA the 300 mV Vce(sat) at 500 µA base drive keeps the die dissipation at 30 mW, leaving margin for switching transients.
Active lifecycle — no end-of-life risk for ongoing designs
RoHS compliance is confirmed on the manufacturer's declaration, covering the EU directive requirements for the lead-free solder process.
