Low-current signal switch in a SOT-23-3 footprint
The Infineon SN7002IXTSA1 is an N-channel enhancement-mode MOSFET built for low-power signal switching and load management in 12 V and 24 V industrial systems. With a 60 V drain-source rating and 200 mA continuous drain current, it handles relay coil drives, logic-level translation, and small solenoid actuation where the load stays under a few hundred milliamps. The 5 Ohm on-resistance at 500 mA drive current means conduction loss is manageable at these current levels, but the part is not intended for power conversion — its strength is in switching small loads with minimal board area.
Parametric fit for GPIO-driven loads
The gate threshold is 1.8 V maximum at 26 µA, so 3.3 V logic provides solid overdrive. Input capacitance is 32 pF at 30 V drain-source, keeping switching losses low in the kHz range. The 360 mW dissipation limit in free air (Ta) is the real thermal ceiling — in a 85 °C ambient, derate to about 220 mW, which still covers a 200 mA load at 5 Ohm Rds(on).