A3245ELHLT Allegro Microsystems Inc, A3245ELHLT Datasheet

IC SW HALL EFFECT OMNI SOT23W

A3245ELHLT

Manufacturer Part Number
A3245ELHLT
Description
IC SW HALL EFFECT OMNI SOT23W
Manufacturer
Allegro Microsystems Inc
Type
Omnipolar Switchr
Datasheets

Specifications of A3245ELHLT

Sensing Range
±55G Trip, ±6G Release
Voltage - Supply
3.6 V ~ 24 V
Current - Supply
3.5mA
Output Type
Digital, Open Drain
Features
Regulated Voltage
Operating Temperature
-40°C ~ 85°C
Package / Case
SOT-23W
Magnetic Type
Omnipolar
Operating Supply Voltage (min)
3.6V
Operating Supply Voltage (typ)
5/9/12/15/18V
Operating Supply Voltage (max)
24V
Mag Sensor Operate Point (g)
-15/55Gs
Mag Sensor Release Point (g)
-50/5Gs
Mag Sensor Hysteresis(g)
18Gs
Package Type
SOT-23W
Pin Count
3
Mounting
Surface Mount
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Current - Output (max)
-
Lead Free Status / RoHS Status
Not Compliant, Contains lead / RoHS non-compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
A3245ELHLT-T
Quantity:
5 995
Features and Benefits
▪ Omnipolar operation
▪ Chopper stabilization
▪ Reverse battery protection
▪ Output short circuit protection
▪ Solid state reliability
▪ Small size
▪ Robust EMC capability
▪ High ESD ratings (HBM)
Packages: 3 pin SOT23W (suffix LH), and
3 pin SIP (suffix UA)
Not to scale
A3245-DS, Rev. 7
▫ Superior temperature stability
▫ Extremely low switchpoint drift
▫ Insensitive to physical stress
VCC
Chopper-Stabilized Omnipolar Hall-Effect Switches
Amp
Functional Block Diagram
Amp
Description
The A3245 integrated circuit is an omnipolar, ultrasensitive
Hall-effect switch with a digital output. This device has an
integrated regulator permitting operation to 24 V, making
it the first omnipolar switch available for operation to 24 V.
This device is especially suited for operation over 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 A3245 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 A3245 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
Continued on the next page…
Regulator
To All Subcircuits
Current Limit
Control
GND
<1Ω
VOUT
A3245
®
patented

Related parts for A3245ELHLT

A3245ELHLT Summary of contents

Page 1

Chopper-Stabilized Omnipolar Hall-Effect Switches Features and Benefits ▪ Omnipolar operation ▪ Chopper stabilization ▫ Superior temperature stability ▫ Extremely low switchpoint drift ▫ Insensitive to physical stress ▪ Reverse battery protection ▪ Output short circuit protection ▪ Solid state reliability ...

Page 2

... The A3245 is rated for operation between the ambient temperatures –40°C and 85°C for the E temperature range, and –40°C to 150°C for the L temperature range. The small geometries of the BiCMOS Selection Guide Part Number Packing A3245ELHLT-T 7-in. reel, 3000 pieces/reel A3245EUA-T 3 Bulk, 500 pieces/bag A3245LLHLT-T 7-in ...

Page 3

A3245 Chopper-Stabilized Omnipolar Hall Effect Switches OPERATING CHARACTERISTICS valid over full operating voltage and ambient temperature ranges, unless otherwise noted Characteristic Symbol Electrical Characteristics Supply Voltage 1 V Output Leakage Current I OUTOFF Output On Voltage V OUT(SAT) Output Current ...

Page 4

A3245 Chopper-Stabilized Omnipolar Hall Effect Switches Supply Current (On) versus Ambient Temperature 5.0 4.0 3.0 2.0 1.0 0 – (°C) A Supply Current (Off) versus Ambient Temperature 5.0 4.0 3.0 2.0 1.0 0 – ...

Page 5

A3245 Chopper-Stabilized Omnipolar Hall Effect Switches Operate Point (South) versus Ambient Temperature – (°C) A Release Point (South) versus Ambient Temperature ...

Page 6

A3245 Chopper-Stabilized Omnipolar Hall Effect Switches Magnetic Characteristic Data (Continued) Operate Point (South) versus Supply Voltage (V) CC Release Point (South) versus Supply Voltage 50 45 ...

Page 7

A3245 Chopper-Stabilized Omnipolar Hall Effect Switches THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information Characteristic Package Thermal Resistance Symbol Test Conditions Package LH-3, 1-layer PCB with copper limited to solder pads Package LH-3, 2-layer PCB with 0.926 ...

Page 8

A3245 Chopper-Stabilized Omnipolar Hall Effect Switches Operation The output of this device switches low (turns on) when a mag- netic fi eld perpendicular to the Hall element exceeds the oper- ate point, B (or is less than B ). After ...

Page 9

A3245 Chopper-Stabilized Omnipolar Hall Effect Switches 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 ...

Page 10

A3245 Chopper-Stabilized Omnipolar 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 improving ...

Page 11

A3245 Chopper-Stabilized Omnipolar Hall Effect Switches +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. 802840) Dimensions in millimeters Dimensions exclusive of mold flash, gate burrs, and ...

Page 12

A3245 Chopper-Stabilized Omnipolar Hall Effect Switches 4.09 45° +0.08 3.02 –0.05 2.16 MAX 0.51 REF 1 2 15.75 ±0.51 +0.05 0.43 –0.07 Copyright ©2005-2009, Allegro MicroSystems, Inc. The products described herein are manufactured under one or more of the following ...

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