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Allegro MicroSystems

A3245 Datasheet Preview

A3245 Datasheet

Chopper-Stabilized Omnipolar Hall-Effect Switches

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A3245
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
Small size
Robust EMC capability
High ESD ratings (HBM)
Packages: 3 pin SOT23W (suffix LH)
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® patented
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
Not to scale
VCC
Continued on the next page…
Functional Block Diagram
Amp
Amp
Regulator
To All Subcircuits
Control
Current Limit
VOUT
<1Ω
A3245-DS, Rev. 12
GND




Allegro MicroSystems

A3245 Datasheet Preview

A3245 Datasheet

Chopper-Stabilized Omnipolar Hall-Effect Switches

No Preview Available !

A3245
Chopper-Stabilized Omnipolar Hall Effect Switches
Description (continued)
patented magnetic-polarity-independence feature makes this device
an excellent replacement for reed switches, with improved ease of
manufacturing, because the A3245 does not require manufacturers
to orient their magnets. These devices allow simple on/off switching
in industrial, consumer, and automotive applications.
TheA3245 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
process allow these devices to be provided in ultrasmall packages.
Package LH is an SOT23W, a miniature low-profile surface-
mount package. It is lead (Pb) free, with 100% matte tin plated
leadframe.
Selection Guide
Part Number
Packing*
A3245ELHLT-T 7-in. reel, 3000 pieces/reel
A3245LLHLT-T 7-in. reel, 3000 pieces/reel
*Contact Allegro for additional packing options.
Mounting
3-pin SOT23W surface mount
3-pin SOT23W surface mount
Ambient, TA (°C)
–40 to 85
–40 to 150
Absolute Maximum Ratings
Characteristic
Supply Voltage
Reverse-Supply Voltage
Reverse-Supply Current
Output Off Voltage
Output Current
Magnetic Flux Density
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
VCC
VRCC
IRCC
VOUT
IOUTSINK
B
TA
TJ(max)
Tstg
Range E
Range L
Notes
Rating
28
–18
–2
28
Internally Limited
Unlimited
–40 to 85
–40 to 150
165
–65 to 170
Units
V
V
mA
V
G
ºC
ºC
ºC
ºC
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
2


Part Number A3245
Description Chopper-Stabilized Omnipolar Hall-Effect Switches
Maker Allegro MicroSystems
Total Page 12 Pages
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