What this AEC-Q100 Hall switch does in a vehicle
The DRV5021A1EDBZRQ1 is a unipolar Hall-effect switch from Texas Instruments, qualified to AEC-Q100 for automotive use. It switches its open-drain output when a south-pole magnetic field above 4.4 mT is present, and releases when the field drops below 0.2 mT — a 4.2 mT hysteresis window that prevents chatter from vibration or magnetic ripple.
Supply voltage and temperature range — why they matter for a field swap
The SOT-23-3 package is small enough to fit on a cramped ECU daughterboard but large enough to hand-solder with a fine-tip iron if you are replacing one in the field. No hot-air station strictly required — just flux, tweezers, and a steady hand.
Active production — no last-time-buy scramble
That means you can design it into a new BOM today without worrying about a forced migration next year.