A1126LUA-T Allegro Microsystems Inc, A1126LUA-T Datasheet

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A1126LUA-T

Manufacturer Part Number
A1126LUA-T
Description
IC SW HALL EFFECT OMNI 3-SIP
Manufacturer
Allegro Microsystems Inc
Series
-r
Type
Omnipolar Switchr
Datasheet

Specifications of A1126LUA-T

Sensing Range
±55G Trip, ±50G Release
Voltage - Supply
3 V ~ 24 V
Current - Supply
4mA
Current - Output (max)
-
Output Type
Digital, Open Drain
Features
Ultra Sensitive
Operating Temperature
-40°C ~ 150°C
Package / Case
*
Lead Free Status / Rohs Status
Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
A1126LUA-T
Manufacturer:
ALLEGRO原装
Quantity:
20 000
Features and Benefits
• Omnipolar operation
• High speed, 4-phase chopper stabilization
• Insensitive to physical stress
• Reverse battery protection
• Robust EMC capability
• Robust ESD
Packages:
Not to scale
A1126-DS
▫ Low switchpoint drift
▫ Superior temperature stability
3-pin ultramini SIP
1.5 mm × 4 mm × 3 mm
(suffix UA)
VCC
Approximate footprint
Preliminary Datasheet
Chopper-Stabilized Omnipolar Hall-Effect Switch
3-pin SOT23-W
2 mm × 3 mm × 1 mm
(suffix LH)
Regulator
Amplifier
Functional Block Diagram
Recovery
Subject to Change Without Notice May 3, 2011
Signal
To all subcircuits
Description
The A1126 integrated circuit is an omnipolar, ultrasensitive
Hall-effect switch with a digital output. This device has an
integrated regulator permitting operation to 24 V.
This device is especially suited for operation through extended
temperature ranges, up to 150°C. Superior high-temperature
performance is made possible through an Allegro
dynamic offset cancellation, which reduces the residual offset
voltage normally caused by device overmolding, temperature
excursions, and thermal stress.
The A1126 Hall-effect switch includes the following on a
single silicon chip: voltage regulator, Hall-voltage generator,
small-signal amplifier, chopper stabilization, Schmitt trigger,
and a short circuit protected open-drain output. Advanced
BiCMOS wafer fabrication processing is used to take advantage
of low-voltage requirements, component matching, very low
input-offset errors, and small component geometries.
The omnipolar operation of the A1126 allows activation with
either a north or a south polarity field of sufficient strength.
In the absence of a magnetic field, the output is off. This
patented magnetic-polarity–independence feature makes
this device an excellent replacement for reed switches, with
improved ease of manufacturing, because the A1126 does not
Continued on the next page…
Switchpoints
Omnipolar
Control
Current
Limit
GND
VOUT
A1126
®
patented

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A1126LUA-T Summary of contents

Page 1

Chopper-Stabilized Omnipolar Hall-Effect Switch Features and Benefits • Omnipolar operation • High speed, 4-phase chopper stabilization ▫ Low switchpoint drift ▫ Superior temperature stability • Insensitive to physical stress • Reverse battery protection • Robust EMC capability • Robust ESD ...

Page 2

... The A1126 is rated for operation between the ambient temperatures –40°C to 150°C. The available package styles provide magnetically Selection Guide Part Number Packing* A1126LLHLT-T 3,000 pieces per reel A1126LUA-T 500 pieces per bag ® *Contact Allegro for additional packing options Absolute Maximum Ratings Characteristic ...

Page 3

A1126 OPERATING CHARACTERISTICS Characteristics Electrical Characteristics Supply Voltage Output Leakage Current Output On Voltage V Output Current Limit Power-On Time 2,3 Chopping Frequency 3,4 Output Rise Time 3,4 Output Fall Time Supply Current Supply Zener Clamp Voltage Supply Zener Current ...

Page 4

A1126 Average Supply Current (On) versus Temperature 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 -60 -40 - Ambient Temperature, T Average Supply Current (Off) versus Temperature 4.0 3.5 3 2.5 ...

Page 5

A1126 Average Operate Point (South) versus Temperature -60 -40 - Ambient Temperature, T Average Release Point (South) versus Temperature ...

Page 6

A1126 Average Operate Point (North) versus Temperature –15 –20 –25 –30 –35 –40 –45 –50 –55 -60 -40 - Ambient Temperature, T Average Release Point (North) versus Temperature –5 –10 – –20 –25 –30 ...

Page 7

A1126 Average Hysteresis (South) versus Temperature -60 -40 - Ambient Temperature, T Average Hysteresis (North) versus Temperature 3.0 V ...

Page 8

A1126 THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information Characteristic Package Thermal Resistance *Additional thermal information available on Allegro Web site. Preliminary Datasheet Subject to Change Without Notice May 3, 2011 Chopper-Stabilized Omnipolar Hall-Effect Switch Symbol Package ...

Page 9

A1126 The output of these devices switches low (turns on) when a magnetic field perpendicular to the Hall sensor chip exceeds the operate point threshold After turn-on, the output voltage OPx The output transistor is ...

Page 10

A1126 V+ 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 produced at the ...

Page 11

A1126 The device must be operated below the maximum junction temperature of the device, T (max) . Under certain combina- J tions of peak conditions, reliable operation may require derating supplied power or improving the heat dissipation properties of the ...

Page 12

A1126 +0.12 2.98 –0.08 3 +0.10 2.90 –0. 10° REF 0.95 BSC For Reference Only; not for tooling use (reference DWG-2840) Dimensions in millimeters Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead ...

Page 13

A1126 45° +0.08 3.02 –0.05 2.16 MAX 0.51 REF 15.75 ±0.51 +0.05 0.43 –0.07 Copyright ©2010-2011, Allegro MicroSystems, Inc. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such de par tures from the detail spec i ...

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