3134

LOW-HYSTERESIS

BIPOLAR HALL-EFFECT SWITCH

FOR HIGH-TEMP. OPERATION

115 Northeast Cutoff, Box 15036

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

APPLICATIONS INFORMATION

Extensive applications information for Hall-effect sensors is available in:

• Hall-Effect IC Applications Guide, Application Note 27701;

• Hall-Effect Devices: Soldering, Gluing, Potting, Encapsulating, and Lead

Forming, Application Note 27703.1;

• Soldering of Through-Hole Hall-Sensor Dervices, Application Note 27703;

and

• Soldering of Surface-Mount Hall-Sensor Devices, Application Note 27703.2.

All are provided in Allegro Electronic Data Book, AMS-702. or at

www.allegromicro.com

OPERATION

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

at the Hall sensor exceeds the operate point threshold (B

output voltage is V

release point (B

can occur when the magnetic field is removed but to ensure release, a field

reversal is required. The difference in the magnetic operate and release points

is called the hysteresis (B

clean switching of the output even in the presence of external mechanical

vibration and electrical noise.

Powering up the device in the absence of a magnetic field (less than B

OP

and higher than B

is warranted after the first excursion beyond B

Suffix “UA”

SENSOR LOCATIONS

(

±0.005" [0.13 mm] die placement)

1

3

2

Dwg. MH-011-4C

0.0195"

0.50 mm

NOM

BRANDED

SURFACE

ACTIVE AREA DEPTH

0.083"

2.10 mm

0.060"

1.51 mm

A

Suffix “LT”

1

3

2

Dwg. MH-008-4C

0.0305"

0.775 mm

NOM

ACTIVE AREA DEPTH

0.050"

1.27 mm

0.090"

2.27 mm

A

The products described herein are manufactured under one or more of the following

U.S. patents: 5,045,920; 5,264,783; 5,442,283; 5,389,889; 5,581,179; 5,517,112;

5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and

other patents pending.

Allegro MicroSystems, Inc. reserves the right to make, from time to time, such

departures from the detail specifications as may be required to permit improvements in

the performance, reliability, or manufacturability of its products. Before placing an

order, the user is cautioned to verify that the information being relied upon is current.

Allegro products are not authorized for use as critical components in life-support

appliances, devices, or systems without express written approval.

The information included herein is believed to be accurate and reliable. However,

Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringe-

ments of patents or other rights of third parties that may result from its use.