Hall switch

Overview

Memsic's Hall switches combine a Hall sensor and its switching circuit on one low-power CMOS chip, with built-in sensitivity and temperature compensation. They draw about 2.5 µA typical at 1.8 V and run from 1.65 to 5.5 V, which suits always-on lid and cover detection in battery devices. Parts are offered in DFN4, SOT23 and SOT553 packages with unipolar or omnipolar outputs.

Built for

TWS earbud charging case lid detection
Laptop and tablet cover switches
Smart meters
Wearables and domestic appliances

Key features

Ultra-low power

Supply current is 2.5 µA typical and 5 µA maximum at 1.8 V.

Wide supply range

Operates from 1.65 to 5.5 V.

Small packages

The MHA100KN comes in a 1.0 x 1.4 x 0.37 mm DFN4, with SOT23 and SOT553 options in the MHA18x series.

Defined hysteresis

A hysteresis window of a few gauss keeps the open and close switch points consistent.

Output options

Parts cover dual N/S output, single S-pole unipolar and omnipolar push-pull output.

RF noise immunity

Memsic lists good RF noise immunity for use near radios.

Specifications

Technology: Hall effect, low-power CMOS
Supply voltage: 1.65 to 5.5 V
Supply current: 2.5 µA typ, 5 µA max at 1.8 V
Operate point (BOP): 37 G typ
Release point (BRP): 30 G (MHA100KN), 27 G (MHA18x) typ
Wake period: 50 ms typ
Output modes: Unipolar, omnipolar, dual N/S
Packages: DFN4, SOT23, SOT553
Operating temp: -40 to +85 °C

Part numbers (link to datasheets)

Part	Polarity / output	Operate / release (typ)	Supply	Current (typ)	Package	Notes
MHA100KN	Dual output, N and S pole (omnipolar)	37 G / 30 G	1.65 to 5.5 V	2.5 µA at 1.8 V	DFN4 1.0 x 1.4 x 0.37 mm	Separate N and S outputs
MHA182AS-S	Single output, S-pole unipolar, push-pull	37 G / 27 G	1.65 to 5.5 V	2.5 µA at 1.8 V	SOT553 1.2 x 1.6 x 0.5 mm	ESD HBM ±3.5 kV
MHA183AS	Single output, omnipolar, push-pull	37 G / 27 G	1.65 to 5.5 V	2.5 µA at 1.8 V	SOT23 2.9 x 1.6 x 1.1 mm	ESD HBM ±4.5 kV