A1140LLH ALLEGRO [Allegro MicroSystems], A1140LLH Datasheet

A1140LLH

Manufacturer Part Number

A1140LLH

Description

Sensitive Two-Wire Chopper-Stabilized Unipolar Hall-Effect Switches

Manufacturer

ALLEGRO [Allegro MicroSystems]

Datasheet

1.A1140LLH.pdf (11 pages)

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A1140-DS

Supply Voltage, V

Reverse-Supply Voltage, V

Magnetic Flux Density, B .........................Unlimited

Operating Temperature

Storage Temperature, T

1. VCC

2. No connection

3. GND

Ambient, T

Maximum Junction, T

AB SO LUTE MAX I MUM RAT INGS

1. VCC

2. GND

3. GND

Package LH, 3-pin SOT

Package UA, 3-pin SIP

, Range E.................. –40ºC to 85ºC

, Range L................ –40ºC to 150ºC

.......................................... 28 V

.................. –65ºC to 170ºC

J(max)

RCC

........................ –18 V

........................165ºC

A1140/41/42/43

The A1140, A1141, A1142, and A1143 devices are sensitive, two-wire, unipo-

lar, Hall effect switches that are factory-programmed at end-of-line to optimize

magnetic switchpoint accuracy. These devices are produced on the Allegro

MicroSystems advanced BiCMOS wafer fabrication process, which implements a

patented, high-frequency, chopper-stabilization technique that achieves magnetic

stability and eliminates the offsets that are inherent in single-element devices

exposed to harsh application environments. Commonly found in a number of

automotive applications, the A1140-43 family of devices are utilized to sense: seat

track position, seat belt buckle presence, hood/trunk latching, and shift selector

position.

Two-wire unipolar switches are particularly advantageous in price-sensitive appli-

cations, because they require one less wire than the more traditional open-collec-

tor output switches. Additionally, the system designer gains inherent diagnostics

because output current normally ﬂ ows in either of two narrowly-speciﬁ ed ranges.

Any output current level outside of these two ranges is a fault condition. The

A1140-43 family of devices also features on-chip transient protection, and a Zener

clamp to protect against overvoltage conditions on the supply line.

The output currents of the A1141 and A1143 switch

polarity magnetic ﬁ eld of sufﬁ cient strength; and switch

when there is no signiﬁ cant magnetic ﬁ eld present. The A1140 and A1142 have

inverted output current levels: switching

magnetic ﬁ eld of sufﬁ cient strength, and

their speciﬁ ed

All family members are offered in two package styles: SOT-23W, a miniature low-

proﬁ le package for surface-mount applications (sufﬁ x –LH), and TO-92, three-

lead ultra-mini Single Inline Package (SIP) for through-hole mounting

(sufﬁ x –UA).

Field-programmable versions are also available. Refer to: A1180, A1181, A1182,

and A1183.

Features and Beneﬁ ts

Low switchpoint drift over operating tem-

Low stress sensitivity

Chopper stabilization

perature range

Factory programmed at end-of-line for

optimized switchpoints

Sensitive Two-Wire Chopper-Stabilized

LOW

current supply levels.

Unipolar Hall-Effect Switches

LOW

HIGH

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

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

www.allegromicro.com

in the presence of a south polarity

otherwise. The devices also differ in

Supply transient protection

Reverse-battery protection

On-board voltage regulator

3.5 V to 24 V operation

On-chip protection

HIGH

LOW

in the presence of a south

otherwise, including

Related parts for A1140LLH

A1140LLH Summary of contents

Page 1

Package LH, 3-pin SOT 1. VCC 2. No connection 3. GND Package UA, 3-pin SIP 1. VCC 2. GND 3. GND AB SO LUTE MAX I MUM RAT INGS Supply Voltage, V .......................................... Reverse-Supply Voltage, V ........................ ...

Page 2

... Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches V+ VCC 0.01 uF Use the complete part numbers when ordering Part Number A1140ELH A1140EUA A1140LLH A1140LUA A1141ELH A1141EUA A1141LLH A1141LUA A1142ELH A1142EUA A1142LLH A1142LUA A1143ELH A1143EUA A1143LLH A1143LUA 1 South (+) magnetic ﬁ elds must be of sufﬁ cient strength. ...

Page 3

Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches ELECTRICAL CHARACTERISTICS Characteristic Symbol Supply Voltage Supply Current 1 Zener Clamp Supply Voltage V Zener Clamp Supply Current 2 I Output Slew Rate 3 Chopping Frequency Power-On Time 4 5 Power-On State 1 ...

Page 4

Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches I versus Ambient Temperature CC(L) at Various Levels of V (A1140, A1141, A1142, A1143 – Ambient Temperature, T Switchpoint versus Ambient Temperature (A1143) 110 105 ...

Page 5

Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information Characteristic Package Thermal Resistance A1140-DS A1140/41/42/43 Symbol Test Conditions Package LH, minimum-K PCB (single-sided with copper limited to solder pads) Package LH, ...

Page 6

Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches Operation The output the A1140 and A1142 devices switch low CC after the magnetic ﬁ eld at the Hall sensor exceeds the oper- ate point threshold When the ...

Page 7

Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches Chopper Stabilization Technique When using Hall-effect technology, a limiting factor for switch- point accuracy is the small signal voltage developed across the Hall element. This voltage is disproportionally small relative to the offset ...

Page 8

Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches For additional general application information, visit the Allegro MicroSystems Web site at www. allegromicro.com. Typical Application Circuit The A114x family of devices must be protected by an external bypass capacitor connected ...

Page 9

Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches Power Derating The device must be operated below the maximum junction temperature of the device Under certain combinations of J(max) peak conditions, reliable operation may require derating sup- plied power or ...

Page 10

Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches 3.10 .122 2.90 .114 3 0.96 .038 NOM 2.10 .083 1.85 .073 3.00 .118 2.70 .106 1 0.50 .020 0.30 .012 0.55 .022 REF .122 .117 A1140-DS A1140/41/42/43 Package LH, 3-Pin; (SOT-23W) 1.49 ...

Page 11

Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches A1140-DS A1140/41/42/43 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 ...

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