Dual high-side switch with integrated protection
The Infineon BTS5231GS is a PROFET® dual-channel high-side power switch in a PG-DSO-14-18 package, designed to drive resistive, inductive, and lamp loads in 12V and 24V automotive and industrial systems. Each of the two N-channel outputs is rated for a maximum continuous current of 1.8A, with a typical on-resistance of 140mOhm (max) per channel. The switch operates from a 4.5V to 28V load supply and requires no Vcc/Vdd bias — the load voltage itself powers the internal charge pump and logic. Input is non-inverting with a simple On/Off interface, making it a drop-in replacement for a discrete MOSFET plus driver in applications where fault reporting and protection are needed.
Fault protection suite — what it covers
The BTS5231GS integrates current limiting (fixed), open-load detection, overtemperature shutdown, and overvoltage clamping. The Status Flag output signals a fault condition to the microcontroller, and the Auto Restart feature re-enables the channel after an overtemperature fault once the junction cools below the threshold. This protection set eliminates the need for external sense resistors, comparators, or a separate overvoltage clamp diode — the PROFET handles it on-chip. For a 24V truck system or a 12V passenger-car ECU, the 28V load supply maximum provides headroom for load-dump transients, though the overvoltage clamp catches the spike if it exceeds the rating.
150°C junction — where it fits
The 150°C Tj ceiling means the die can handle self-heating from a 1.8A load in a 105°C ambient, provided the PCB copper area under the PG-DSO-14-18 package is adequate for heat spreading.
Obsolete — sourcing reality
Infineon lists the BTS5231GS as Obsolete. For existing BOM lines, procurement must turn to the independent distribution channel — surplus inventory, last-time-buy stockpiles, or broker-sourced material. No pin-compatible second source or direct replacement is listed in the Infineon PROFET family with the same PG-DSO-14-18 footprint and dual 1.8A rating. A board redesign with a current-generation PROFET (e.g., BTS5xxx series in a similar package) is the typical migration path, but the pinout and protection feature set must be verified against the new datasheet.