{"title":"Hall Effect Sensor - US1881","handle":"hall-effect-sensor-us1881","url":"/products/hall-effect-sensor-us1881","description":"The US1881 is a latching Hall effect sensor in a TO-92 package. When exposed to a magnetic field above the operating threshold, the open-collector output latches LOW and stays there until a reversed magnetic field pulls it back HIGH. This makes it ideal for detecting the presence or rotation of magnets — commonly used in RPM sensing, door/window detection, and position feedback.\n\nThe sensor includes an onboard bandgap regulator for temperature compensation and operates across a wide 3.5–24 V DC supply range with built-in reverse-polarity protection.\n\nKey Features\n\n\nLatching Output – Toggles and holds state on magnetic field reversal\n\nWide Supply Range – 3.5–24 V DC\n\nOpen-Collector Output – 50 mA max sink current\n\nTemperature Compensated – Stable operation across temperature range\n\nReverse-Polarity Protection – Built-in supply protection\n\nSchmitt Trigger – Hysteresis for clean, noise-free switching\n\nTO-92 Package – Compact, lead-free through-hole\n\n\nSpecifications\n\n\nSensor: US1881 (latching Hall effect)\n\nSupply Voltage: 3.5–24 V DC\n\nOutput: Open-collector (50 mA max sink)\n\nPackage: TO-92\n\n\nIdeal For\n\nMagnet presence and proximity detection\nRPM and rotation sensing\nDoor and window open/close detection\nPosition feedback in mechanical systems\n\n\nPackage Contents\n\n1× US1881 Hall Effect Sensor (TO-92)\n\n\nResources\n\nUS1881 Datasheet (PDF)\n","vendor":"SparkFun","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":9825,"title":"Default Title","sku":"SF-COM-09312","price":2.17,"compare_at_price":0.0,"on_sale":false,"in_stock":true,"available_quantity":314,"option1":"Default Title"}]}