A high-side switch that handles the rough stuff
The Infineon BTS4140NNT is a single-channel high-side power switch in a PG-SOT223-4 package, designed to drive resistive, inductive, and capacitive loads from a 4.9V to 60V supply rail. It delivers up to 200 mA continuous output with a typical on-resistance of 1 Ohm, keeping voltage drop and self-heating manageable even in a tight layout. The switch integrates current limiting, over-temperature protection, and over-voltage clamping — so a shorted load or a load-dump transient won't take out the trace or the MCU GPIO driving it.
The 60 V load voltage ceiling means this switch sits comfortably on 12 V and 24 V vehicle electrical systems, and it has headroom for 48 V industrial bus rails. The 200 mA continuous output is enough for relays, solenoids, indicator LEDs, and small DC motors — but not for a headlamp or a pump. The 1 Ohm Rds(on) at 200 mA drops only 0.2 V, so the load sees nearly the full rail voltage. The auto-restart feature (listed in the features) means the switch tries to re-energise the load after a fault clears — useful for a lamp that cools down or a motor that un-stalls, but something to note if you want latched-off behaviour.
Lifecycle reality — obsolete, but sourced
The PG-SOT223-4 package (TO-261-4 equivalent) is a surface-mount footprint with a large tab for thermal dissipation. The 1:1 input-to-output ratio means one GPIO pin controls one load — no serial interface, no diagnostics, just On/Off via a non-inverting input.