AH3782

Document number: DS38083 Rev. 1 - 2

1 of 14

www.diodes.com

September 2015

© Diodes Incorporated

AH3782

HIGH-VOLTAGE, HIGH-SENSITIVITY HALL EFFECT LATCH

WITH INTERNAL PULL-UP RESISTOR

Description

The AH3782 is a high-voltage, high-sensitivity Hall Effect latch IC

with internal pull-up resistor designed for commutation of brushless

DC motors, flow meters, linear encoders and position sensors in

industrial and consumer home appliances and personal care

applications. To support a wide range of demanding applications, the

design has been optimized to operate over the supply range of 3.0V

to 28V. With chopper stabilized architecture and an internal bandgap

regulator to provide temperature compensated supply for internal

circuits, the AH3782 provides a reliable solution over the whole

operating range. For robustness and protection, the device has a

Zener clamp on the supply. The output has an overcurrent limit and a

Zener clamp.

The internally pulled-up output can be switched on with South pole of

sufficient strength and switched off with North pole of sufficient

strength. When the magnetic flux density (B) perpendicular to the part

switched on (pulled low). The output is held latched until magnetic flux

The magnetic operating and release polarity is opposite for SOT23

and SC59 packages. SOT23 and SIP-3 packages will require South

pole to the part marking side to operate while SC59 will require North

pole to the part marking side.

Features

•

Bipolar Latch Operation (South Pole: On, North Pole: off)

•

•

•

Internally Pull-up Resistor on the Output Pin

•

Output Overcurrent Limit

•

Chopper Stabilized Design Provides

-

Superior Temperature Stability

-

Minimal Switch Point Drift

-

Enhanced Immunity to Stress

•

Good RF Noise Immunity

•

Zener Clamp on Supply and Output Pins

•

•

ESD (HBM): 6kV

•

Industry Standard SC59, SOT23 and SIP-3 Packages

•

Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)

•

Halogen and Antimony Free. “Green” Device (Note 3)

Pin Assignments

(Top View)

GND 2

3 OUTPUT

SC59 and SOT23

(Top View)

2. GND

3. OUTPUT

SIP-3

Applications

•

Brushless DC Motor Commutation

•

Revolution Per Minute (RPM) Measurement

•

Flow Meters

•

Angular and Linear Encoder and Position Sensors

•

Contact-less Commutation, Speed Measurement and Angular

Position Sensing/Indexing in Consumer Home Appliances, Office

Equipments and Industrial Applications

Notes:

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"

and Lead-free.

3. Halogen- and Antimony-

free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.