MICROPOWER,

ULTRA-SENSITIVE

HALL-EFFECT SWITCHES

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

8

SENSOR LOCATIONS

(

±0.005” [0.13 mm] die placement)

Package Designator ‘LH’

Package Designators ‘UA’, UA-LC', and ‘UA-TL’

Although sensor location is accurate to three sigma for a

particular design, product improvements may result in small

changes to sensor location.

OUTPUT

Dwg. EH-013-2

0.1

µF

SUPPLY

(3 V BATTERY)

10 pF

1

3

2

Dwg. MH-011-11

0.018"

0.46 mm

NOM

BRANDED

SURFACE

ACTIVE AREA DEPTH

0.081"

2.06 mm

0.057"

1.45 mm

A

0.038"

0.96 mm

1

2

Dwg. MH-025

0.011"

0.28 mm

NOM

ACTIVE AREA DEPTH

0.059"

1.49 mm

A

3

Allegro

Applications. Allegro's pole-independent sensing technique

allows for operation with either a north pole or south pole

magnet orientation, enhancing the manufacturability of the

device. The state-of-the-art technology provides the same

output polarity for either pole face.

It is strongly recommended that an external bypass capaci-

tor be connected (in close proximity to the Hall sensor) between

the supply and ground of the device to reduce both external

noise and noise generated by the chopper-stabilization tech-

nique. This is especially true due to the relatively high imped-

ance of battery supplies.

The simplest form of magnet that will operate these devices

is a bar magnet with either pole near the branded surface of the

device. Many other methods of operation are possible. Exten-

sive applications information on magnets and Hall-effect

sensors is also available in the Allegro Electronic Data Book

AMS-702 or Application Note 27701, or at

www.allegromicro.com

0

+B

0

Dwg. GH-043-1

-B

OUTPUT ON

5 V

MAX

BOPS

BRPS

B OPN

BRPN

MAGNETIC FLUX

OUTPUT OFF