AH337

SINGLE PHASE HALL EFFECT SWITCH

AH337

Document number: DS31050 Rev. 9 - 2

1 of 9

www.diodes.com

July 2010

© Diodes Incorporated

Description

AH337 is an unipolar Hall-Effect sensor for contactless

switching applications. The device includes an on-chip Hall

voltage generator for magnetic sensing, an amplifier that

amplifies the Hall voltage, a Schmitt trigger to provide

switching hysteresis for noise rejection, and an open-collector

output. The band-gap regulator allows a wide operating

voltage 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 falls

below Brp. When B is less than Brp, the output is switched

off.

The AH337 is available in SIP-3L and SC59 packages.

Features

•

Unipolar Hall-Effect sensor

•

4.2V to 28V DC operating voltage

•

Temperature compensation

•

Open drain pre-driver

•

25mA maximum 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. Vdd

2. GND

3. OUT

SIP-3L

1. Vdd

GND 2.

3. OUT

(Top View)

SC59

Applications

•

VCD/DVD Loader, CD/DVD ROM

•

Cover Detector

•

Speed Measurement

•

Home Appliances

•

Home Safety

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

AH337

4.2V ~ 28 V

Output

Vdd

GND

L

R