Omnipolar detection with ±9.5 mT threshold
The TMAG5123C1CQDBZR is an omnipolar Hall switch from Texas Instruments — it responds to either a north or south pole field exceeding ±9.5 mT, then releases at ±3.5 mT. That means the magnet orientation on the assembly line is non-critical; a passing pole in either direction triggers the output, simplifying fixturing and reducing alignment tolerance. The open-drain output lets the device sink current into a pull-up rail of your choice — useful when the downstream logic runs at a different voltage than the 2.5 V supply.
Texas Instruments lists this part as Active.