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 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

• US1881 Datasheet (PDF)