a1120elhlt-t2 Allegro MicroSystems, Inc., a1120elhlt-t2 Datasheet

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a1120elhlt-t2

Manufacturer Part Number
a1120elhlt-t2
Description
Chopper Stabilized Precision Hall Effect Switches
Manufacturer
Allegro MicroSystems, Inc.
Datasheet
Features and Benefits
▪ Unipolar switchpoints
▪ Resistant to physical stress
▪ Superior temperature stability
▪ Output short-circuit protection
▪ Operation from unregulated supply
▪ Reverse battery protection
▪ Solid-state reliability
▪ Small package sizes
Packages:
A1120-DS, Rev. 10
3-pin SOT23W (suffix LH)
Not to scale
VCC
Chopper Stabilized Precision Hall Effect Switches
3-pin SIP (suffix UA)
Amp
Functional Block Diagram
Low-Pass
Filter
Description
The A1120 and A1125 Hall-effect, unipolar switches are
extremely temperature-stable and stress-resistant sensor ICs,
especially suited for operation over extended temperature
ranges to 150°C. Superior high-temperature performance is
made possible through dynamic offset cancellation, which
reduces the residual offset voltage normally caused by device
overmolding, temperature dependencies, and thermal stress.
Each device includes on a single silicon chip a voltage regulator,
Hall-voltage generator, small-signal amplifier, chopper
stabilization, Schmitt trigger, and a short-circuit protected
open-drain output to sink up to 25 mA.
An on-board regulator permits operation with supply voltages
of 3 to 24 V. The advantage of operating down to 3 V is that
the device can be used in 3 V applications or with additional
external resistance in series with the supply pin for greater
protection against high voltage transient events.
For the A1120, a south pole of sufficient strength turns the
output on. Removal of the magnetic field turns the output off.
The A1125 is complementary to the A1120 in that, for the
A1125, a south pole turns the output off, and removal of the
magnetic field turns the output on.
Two package styles provide a magnetically optimized package
for most applications. Package type LH is a modified SOT23W,
surface mount package, while UA is a three-lead ultra-mini SIP
for through-hole mounting. Each package type is lead (Pb) free
(suffix, –T), with a 100% matte tin plated leadframe.
Regulator
To All Subcircuits
Current Limit
Control
A1120 and A1125
GND
VOUT

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a1120elhlt-t2 Summary of contents

Page 1

Chopper Stabilized Precision Hall Effect Switches Features and Benefits ▪ Unipolar switchpoints ▪ Resistant to physical stress ▪ Superior temperature stability ▪ Output short-circuit protection ▪ Operation from unregulated supply ▪ Reverse battery protection ▪ Solid-state reliability ▪ Small package ...

Page 2

... A1120 and Chopper Stabilized Precision Hall Effect Switches A1125 Selection Guide 1 Part Number Packing A1120ELHLX-T 13-in. reel, 10000 pieces/reel A1120ELHLT-T 2 7-in. reel, 3000 pieces/reel A1120EUA-T Bulk, 500 pieces/bag A1120LLHLX-T 13-in. reel, 10000 pieces/reel 2 A1120LLHLT-T 7-in. reel, 3000 pieces/reel A1120LUA-T Bulk, 500 pieces/bag A1125ELHLX-T 13-in. reel, 10000 pieces/reel ...

Page 3

... Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 2 Max. Unit μA 10 μA 500 mV 500 μs – kHz 2 μ ...

Page 4

... Temperature (°C) Test Conditions 2 of copper area each V CC(max) V CC(min) 140 160 180 140 160 180 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com Value Units 228 ºC/W 110 ºC/W 165 ºC/W 4 ...

Page 5

... All are provided in Allegro Electronic Data Book, AMS-702, and ) will the Allegro Web site, www.allegromicro.com OUT(SAT HYS ( VCC R A1120 VOUT A1125 Output C BYP 0.1 μF GND (C) Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com L 5 ...

Page 6

... For such applications, Allegro recommends its digital device families with lower sensitivity to jitter. For more information on those devices, contact your Allegro sales representative. Regulator Clock/Logic Amp Low-Pass Filter 6 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com ...

Page 7

... V (max ≤ V CC(est) CC CC(est) and V (max) requires enhanced CC(est) CC ≥ V (max), then operation between V CC(est) CC (max) is reliable under these conditions. Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com , J(max) (max). First CC(est) (max), then reli- CC CC(est) 7 ...

Page 8

... MIN 1.00 0.95 Seating Plane PCB Layout Reference View Gauge Plane B NNT 1 C Standard Branding Reference View N = Last two digits of device part number T = Temperature code Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 2.40 8 ...

Page 9

... The in for ma tion in clud ed herein is believed rate and reliable. How ev er, Allegro MicroSystems, Inc. assumes no re spon si bil i ty for its use; nor for any in fringe ment of patents or other rights of third parties which may result from its use. ...

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