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Hall Effect Sensor - US1881
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 lat...
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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.
The 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.
Key Features
- Latching Output – Toggles and holds state on magnetic field reversal
- Wide Supply Range – 3.5–24 V DC
- Open-Collector Output – 50 mA max sink current
- Temperature Compensated – Stable operation across temperature range
- Reverse-Polarity Protection – Built-in supply protection
- Schmitt Trigger – Hysteresis for clean, noise-free switching
- TO-92 Package – Compact, lead-free through-hole
Specifications
- Sensor: US1881 (latching Hall effect)
- Supply Voltage: 3.5–24 V DC
- Output: Open-collector (50 mA max sink)
- Package: TO-92
Ideal For
- Magnet presence and proximity detection
- RPM and rotation sensing
- Door and window open/close detection
- Position feedback in mechanical systems
Package Contents
- 1× US1881 Hall Effect Sensor (TO-92)
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- Temperature compensation
- Temperature compensation is when a sensor or instrument adjusts its readings to reduce errors caused by changes in temperature. This matters because a sensor's raw output often drifts as conditions warm or cool, so compensation keeps readings more consistent and accurate over time.
- through-hole
- A mounting style where the component leads pass through holes in a circuit board and are soldered on the other side. Through-hole parts are often easier to handle and solder by hand, which is useful for classroom and hobby projects.
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US1881 Hall Effect Sensor Datasheet
Datasheet · 500.3 KB · Click any page to view full size
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