H-bridge motor driver for brushed DC and bipolar stepper loads
The Texas Instruments DRV8231ADDAR is a fully integrated H-bridge motor driver that combines control logic and power NMOS output stage in a single 8-PowerSOIC package. It drives one brushed DC motor or one winding of a bipolar stepper motor using a PWM interface, with the supply and motor voltage range spanning 4.5 V to 33 V. The continuous output current rating of 3.7 A supports small-to-medium format printers, office automation, and similar motion-control loads where board space is tight. The junction temperature range of -40°C to 150°C covers industrial and under-hood automotive environments without derating at the high end.
3.7 A continuous output — sizing the load and thermal path
The 3.7 A output current is the continuous rating per the datasheet typical column. For a brushed DC motor running at 2 A to 3 A steady-state, this part provides roughly 20% headroom before the thermal limit. The 8-PowerSOIC package with exposed PowerPad is the primary heat path — the PCB land pattern must include a thermal via array under the pad to keep the junction below 150°C at full load. At 3.7 A continuous, the copper pour area on the bottom layer should be sized for the expected dissipation; the datasheet's thermal impedance curves are the reference, not the absolute-max junction alone.
Active lifecycle — no near-term end-of-life risk
The DRV8231ADDAR carries an Active product status with ROHS3 compliance. The active status also supports new design-ins — no need to qualify a replacement mid-cycle.