Pre-driver for 12V BLDC fans — supply rail and gate drive budget
The ROHM BD61243FV-GE2 is a commutation controller and direction manager for brushless DC (BLDC) motors, operating from a 5.5V to 16V supply rail. It outputs a PWM signal to drive external half-bridge MOSFETs — this is a pre-driver, not a fully integrated power stage, so your BOM needs the FET pair and a bootstrap diode per phase. The 200 mA gate drive current is sized for small-signal MOSFETs typical in 12V fan applications; if you are switching larger dies or need faster rise times, budget a separate gate driver.
14-SSOPB footprint and temperature grade
Housed in a 14-TSSOP (4.40 mm wide) package with the supplier device code 14-SSOPB — the same 0.65 mm pitch as the standard TSSOP-14 footprint, so no layout surprise if you have used that land pattern before. Surface-mount only; no through-hole variant exists.
DMOS output stage and PWM interface
The DMOS output technology delivers the 200 mA gate drive with the low Rds(on) characteristic of vertical DMOS transistors — this keeps the driver's own dissipation low in the 14-pin package. The PWM input accepts a standard logic-level signal for speed control; the controller handles commutation and direction internally. No external Hall sensors are mentioned in the function block — confirm whether your motor uses sensorless back-EMF commutation or if you need a sensor input elsewhere.
For a production BOM targeting 12V BLDC fan drivers, this part is safe to qualify in now without an imminent obsolescence watch.