# Hall Effect Sensor - US1881

**SKU:** COM-09312 · **Brand:** [Sparkfun](https://core-electronics.com.au/brands/sparkfun-australia)
**Page:** https://core-electronics.com.au/hall-effect-sensor-us1881.html ([markdown](https://core-electronics.com.au/hall-effect-sensor-us1881.html.md))

The US1881 is an integrated Hall effect latched sensor. That’s nice but what does it do? Holding a magnet near the sensor will cause the output pin to toggle. This makes for a robust presence sensor. A reed sensor also works nicely, but can be limited by the glass encapsulation and size. A hall effect sensor is much smaller, but can handle less current than a reed switch.

## Pricing

- **Price:** $1.80 (inc GST) — $1.64 AUD, exc GST
- **Quantity discounts:** 5+ $1.59 (exc GST) · 25+ $1.55 (exc GST) · 100+ $1.49 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney). Delivered by Tue, 11th of Aug.
- We can dispatch 1 today, and up to 120 more in 5–11 days.

## Description

The US1881 is an integrated Hall effect latched sensor. That’s nice but what does it do? Holding a magnet near the sensor will cause the output pin to toggle. This makes for a robust presence sensor. A reed sensor also works nicely, but can be limited by the glass encapsulation and size. A hall effect sensor is much smaller, but can handle less current than a reed switch.

The device includes an on-chip Hall voltage generator for magnetic sensing, a comparator that amplifies the Hall voltage, and a Schmitt trigger to provide switching hysteresis for noise rejection, and open-collector output. An internal bandgap regulator is used to provide temperature compensated supply voltage for internal circuits and allows a wide operating supply range.

If a magnetic flux density larger than threshold Bop, DO is turned on (low). The output state is held until a magnetic flux density reversal falls below Brp causing DO to be turned off (high).

**Features:**

- 3.5V to 24V DC operation voltage
- Low current consumption
- Temperature compensation
- Wide operating voltage range
- Open-Collector pre-driver
- 50mA maximum sinking output current
- Reverse polarity protection
- Lead Free Package: TO-92
 
**Documents:**

- [Datasheet](https://core-electronics.com.au/attachments/localcontent/Hall-US1881EUA_512333731c1.pdf)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/h/a/hall_effect_sensor_-_us1881__com-09312__01.jpg)