A1140LUA Allegro Microsystems Inc, A1140LUA Datasheet

IC SWITCH HALL EFFECT UNI 3-SIP

A1140LUA

Manufacturer Part Number
A1140LUA
Description
IC SWITCH HALL EFFECT UNI 3-SIP
Manufacturer
Allegro Microsystems Inc
Type
Unipolar Switchr
Datasheets

Specifications of A1140LUA

Sensing Range
110G Trip, 45G Release
Voltage - Supply
3.5 V ~ 24 V
Current - Supply
5mA
Output Type
Digital, Open Drain
Features
Regulated Voltage
Operating Temperature
-40°C ~ 150°C
Package / Case
3-SIP
Magnetic Type
Unipolar
Operating Supply Voltage (min)
3.5V
Operating Supply Voltage (typ)
5/9/12/15/18V
Operating Supply Voltage (max)
24V
Mag Sensor Operate Point (g)
110Gs
Mag Sensor Release Point (g)
45Gs
Mag Sensor Hysteresis(g)
15Gs
Package Type
Ultra Mini SIP
Pin Count
3
Mounting
Through Hole
Operating Temp Range
-40C to 150C
Operating Temperature Classification
Automotive
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Current - Output (max)
-
Lead Free Status / Rohs Status
Not Compliant
Features and Benefits
▪ Chopper stabilization
▪ Factory programmed at end-of-line for optimized
▪ On-chip protection
Packages: 3 pin SOT23W (suffix LH), and
3 pin SIP (suffix UA)
Not to scale
A1140-DS, Rev. 8
switchpoints
▫ Low switchpoint drift over operating
▫ Low sensitivity to stress
▫ Supply transient protection
▫ Reverse-battery protection
▫ On-board voltage regulator
▫ 3.5 to 24 V operation
temperature range
V+
0.01 uF
VCC
Functional Block Diagram
Sensitive Two-Wire Chopper-Stabilized
Clock/Logic
Amp
Low-Pass
Filter
Unipolar Hall Effect Switches
Description
The A1140, A1141, A1142, and A1143 devices are sensitive,
two-wire, unipolar, Hall effect switches that are factory-
programmed at end-of-line to optimize magnetic switchpoint
accuracy. These devices use a patented high frequency chopper-
stabilization technique, produced using the Allegro advanced
BiCMOS wafer fabrication process, to achieve magnetic
stability and to eliminate offset inherent in single-element
devices exposed to harsh application environments.
Commonly found in a number of automotive applications,
these switches are utilized to sense seat track position,
seat belt buckle presence, hood/trunk latching, and shift
selector position. Two-wire unipolar switches, such as the
A1140/41/42/43 family, are particularly advantageous in
price-sensitive applications because they require one less
wire for operation than do switches with the more traditional
open-collector output. Additionally, the system designer
inherently gains diagnostics because there is always output
current flowing, which should be in either of two narrow
ranges. Any current level not within these ranges indicates a
fault condition. The A1140/41/42/43 family of switches also
Continued on the next page…
A1140, A1141, A1142, and A1143
Regulator
To All Subcircuits
Package UA Only
GND
GND

Related parts for A1140LUA

A1140LUA Summary of contents

Page 1

Features and Benefits ▪ Chopper stabilization ▫ Low switchpoint drift over operating temperature range ▫ Low sensitivity to stress ▪ Factory programmed at end-of-line for optimized switchpoints ▪ On-chip protection ▫ Supply transient protection ▫ Reverse-battery protection ▫ On-board voltage ...

Page 2

A1140, A1141, A1142, and A1143 Description (continued) 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 HIGH in the presence of a south ...

Page 3

... Some restrictions may apply to certain types of sales. Contact Allegro for details. 5 The sensors listed in this footnote are available only in limited distribution. Interested customers should contact the appropriate sales person or field application engineer for more information on availability. These variants include: A1140ELHLT-T, A1140EUA-T, A1140LLHLT-T, A1140LUA-T, A1141ELHLT-T, A1141EUA-T, A1141LLHLT-T, and A1141LUA-T. Sensitive Two-Wire Chopper-Stabilized ...

Page 4

A1140, A1141, A1142, and A1143 ELECTRICAL CHARACTERISTICS Characteristic Symbol Supply Voltage CC(L) Supply Current 2 I CC(H) Reverse Supply Current I RCC Supply Zener Clamp Voltage V ZSUPPLY Supply Zener Clamp Current I ZSUPPLY Output Slew ...

Page 5

A1140, A1141, A1142, and A1143 Supply Current (Low) versus Ambient Temperature at Various Levels of V (A1140 and A1141 – 100 Ambient Temperature, T Operate Point versus Ambient Temperature at Various Levels ...

Page 6

A1140, A1141, A1142, and A1143 THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information Characteristic Package Thermal Resistance *Additional thermal information available on Allegro Web site. Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches Symbol Test Conditions* Package LH, ...

Page 7

A1140, A1141, A1142, and A1143 Operation The output the A1140 and A1142 devices switch low CC after the magnetic field at the Hall sensor exceeds the operate point threshold When the magnetic field is reduced ...

Page 8

A1140, A1141, A1142, and A1143 Chopper Stabilization Technique When using Hall-effect technology, a limiting factor for switchpoint accuracy is the small signal voltage developed across the Hall element. This voltage is disproportionally small relative to the offset that can be ...

Page 9

A1140, A1141, A1142, and A1143 Typical Application Circuit The A114x family of devices must be protected by an external bypass capacitor connected between the supply, VCC, BYP and the ground, GND, of the device. C noise and the ...

Page 10

A1140, A1141, A1142, and A1143 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 improving the ...

Page 11

A1140, A1141, A1142, and A1143 EMC (Electromagnetic Compatibility) Requirements Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches Device Qualification Program Contact Allegro for information. Contact your local representative for EMC results. Test Name Reference Specification ESD – Human Body Model AEC-Q100-002 ...

Page 12

A1140, A1141, A1142, and A1143 Preliminary dimensions, for reference only Dimensions in millimeters U.S. Customary dimensions (in.) in brackets, for reference only (reference JEDEC TO-236 AB, except case width and terminal tip-to-tip) Dimensions exclusive of mold flash, gate burrs, and ...

Page 13

A1140, A1141, A1142, and A1143 .122 .117 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 ...

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