What this Hall Effect sensor does on your board
The MAX9921AUB+ is a Hall Effect sensor from Analog Devices that accepts a voltage input and delivers a logic-level output — a clean on/off signal for position, proximity, or rotation sensing. It draws 1.3 mA from the supply, low enough to keep the sensor alive in battery-backed or always-on subsystems without eating into the power budget. The operating temperature range of -40°C to 125°C covers automotive under-hood, industrial motor compartments, and outdoor telecom enclosures where the ambient can swing hard.
Package and mounting — fits a tight PCB footprint
Housed in a 10-MSOP package (3.00 mm body width) and specified for surface-mount assembly, the MAX9921AUB+ suits dense PCB layouts where board area is at a premium. The supplier device package is listed as 10-uMAX/uSOP — same footprint, different supplier code. Verify the land pattern against your assembly house's stencil aperture for the 0.118-inch body width; no surprises if you have placed other 10-MSOP Hall sensors before.
Lifecycle and compliance — no LTB watch needed
Marked as Active in the lifecycle record, so there is no last-time-buy clock running on this part. ROHS3 compliant, which clears the EU material restrictions for new designs.