3161 View Datasheet(PDF) - Allegro MicroSystems

Part Name

Description

Manufacturer

3161

HALL-EFFECT SWITCH FOR 2-WIRE APPLICATIONS

Allegro MicroSystems 

3161

HALL-EFFECT SWITCH

FOR 2-WIRE APPLICATIONS

SENSOR LOCATIONS

Suffix “LT”

ACTIVE AREA DEPTH

0.030"

0.76 mm

NOM

0.085"

2.16 mm

0.045"

1.14 mm

A

OPERATION

The output of these devices (pin 3) switches OFF when the magnetic

field at the Hall sensor exceeds the operate point threshold (BOP). When the

magnetic field is reduced to below the release point threshold (BRP), the

device output switches ON. The difference in the magnetic operate and

release points is called the hysteresis (Bhys) of the device. This built-in

hysteresis allows clean switching of the output even in the presence of

external mechanical vibration and electrical noise.

15

1

2

3

Dwg. MH-008-7

Suffix “UA”

ACTIVE AREA DEPTH

0.018"

0.46 mm

NOM

0.078"

1.98 mm

A

BRANDED

SURFACE 1

2

0.054"

1.36 mm

3

Dwg. MH-011-8

Allegro

12

BOP

9.0

6.0

TA = +25°C

3.0

BRP

0

0

25

50

75

100 125 150 175 200

MAGNETIC FLUX DENSITY in GAUSS

Dwg. GH-007-1

APPLICATIONS INFORMATION

These devices are normally operated in a 2-wire mode, where the supply

terminal and the output terminal are tied together. An external comparator

detects the change in total supply current by the addition (output off, B > BOP)

or subtraction (output on, B < BRP) of IOUT.

Hall effect applications information is available in the “Hall-Effect IC

Applications Guide”, which can be found in the latest issue of the Allegro

MicroSystems Electronic Data Book, AMS-702 or Application Note 27701,

or at

www.allegromicro.com.

TYPICAL 2-WIRE APPLICATION

0.1 µF

0.85 V

SUPPLY

Icc + IoUT

–

+

V

CC

100 Ω

Dwg. EH-011A

115 Northeast Cutoff, Box 15036

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

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