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Small green PCB with three-pin Grove connector and hall sensor chip

Seeed Studio

Seeed Studio Grove Hall Sensor A1101 400ns -40 to 85°C

SKU CH-4SF4-K2BY6

A Hall-effect magnetic switch sensor with 400 ns switching speed operating from -40 °C to +85 °C

  • TypeSensors
  • Non-contact Hall switch avoids mechanical wear
  • 400 ns rise and fall for fast magnetic detection
  • Operates from -40 °C to +85 °C extremes
  • Grove socket enables plug-and-play integration
  • A1101 sensor suits industrial and consumer uses

Hall Sensor A1101 400ns

This Grove Hall sensor uses the A1101 magnetic switch for non-contact position detection. It suits engineers and hobbyists building magnetic proximity or speed-sensing projects. The unified Grove socket allows direct connection to compatible microcontroller boards without soldering. Buyers needing analog output or programmable thresholds should choose a different sensor type.

Digital Switching Limits

The device outputs a logic low when a south-pole field exceeds the operate point and returns high when the field drops below the release point. It provides no field-strength measurement, only on-off state changes. The 400 ns transition time sets the maximum practical switching frequency. Designs requiring continuous linear output or north-pole activation will not work with this sensor.

Operating Range -40 to 85°C

The sensor maintains stable switching across a temperature span of -40 to 85 degrees Celsius. This wide range supports automotive, industrial and outdoor deployments where ambient conditions vary sharply. The A1101 Hall-effect switch is specified for reliable operation throughout this interval. Applications exceeding these limits must select a differently rated component.

Highlights

  • Non-contact Hall switch avoids mechanical wear
  • 400 ns rise and fall for fast magnetic detection
  • Operates from -40 °C to +85 °C extremes
  • Grove socket enables plug-and-play integration
  • A1101 sensor suits industrial and consumer uses

Specifications

TypeSensors

Questions about this item

Which version of the Grove Hall Sensor should I choose?

The module uses the A1101 Hall-effect magnetic switch with a 400ns transition period and operates from -40 to +85°C, offered in a single Grove socket variant.

What does the 400ns response time mean in use?

The output switches low when a south-polarity magnetic field exceeds the operate threshold and switches high when it drops below the release point, completing each transition in 400ns.

What interface does the Grove socket use and what does it limit?

The Grove unified socket provides a plug-and-play digital I/O connection; the 400ns switching speed caps the maximum detectable field-change frequency.

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