AH173

INTERNAL PULL-UP HALL EFFECT LATCH FOR HIGH

TEMPERATURE

AH173

Document number: DS31044 Rev. 10 - 2

1 of 9

www.diodes.com

July 2010

© Diodes Incorporated

Description

AH173 is a single-digital-output Hall-Effect latch sensor with

pull-up resistor for high temperature operation. The device

includes an on-chip Hall voltage generator for magnetic

sensing, an amplifier to amplify Hall voltage, a comparator to

provide switching hysteresis for noise rejection, and an

output driver with a pull-up resistor (Rpu). An internal band-

gap regulator provides a temperature compensated supply

voltage for internal circuits and allows a wide operating

supply range.

When the magnetic flux density (B) is larger than operate

point (Bop), output is switched on (OUT pin is pulled low).

The output state is held on until a magnetic flux density

reversal falls below Brp. When B is less than Brp, the output

is switched off.

The AH173 is available in SIP-3L and SC59 packages.

Features

•

Bipolar Hall-Effect latch sensor

•

3V to 20V DC operating voltage

•

Built-in pull-up resistor

•

25mA output sink current

•

Operating temperature: -40

°C to +125°C

•

SIP-3L and SC59 packages

(SC59 is commonly known as SOT23 in Asia)

•

Green Molding Compound (No Br, Sb) (Note 1)

Pin Assignments

(Top View)

1. Vcc

2. GND

3. OUT

SIP-3L

1. Vcc

GND 2.

3. OUT

(Top View)

SC59

Applications

•

Rotor Position Sensing

•

Current Switch

•

Encoder

•

RPM Detection

Notes:

1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at

http://www.diodes.com/products/lead_free.html.

Typical Application Circuit

M

Driver

&

Control Logic

M: Three Phase Hall Motor

Digital Hall Effect Sensor

Hall Motor Driver

RPM sensing

3 Phase Hall Motor