A3282
A3282-DS
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
AB SO LUTE MAX I MUM RAT INGS
Supply Voltage, V
CC
..........................................28 V
Reverse-Supply Voltage, V
RCC
........................–18 V
Output Off Voltage, V
OUT
...............................26.5 V
Output Current, I
OUTSINK
........... Internally Limited
Reverse-Output Current, I
ROUT
....................–10 mA
Magnetic Flux Density, B .........................Unlimited
Operating Temperature
Ambient, T
A
, Range E..................–40ºC to 85ºC
Ambient, T
A
, Range L................–40ºC to 150ºC
Maximum Junction, T
J(MAX)
......................165ºC
Storage Temperature, T
S
..................–65ºC to 170ºC
Chopper-Stabilized Hall Effect Latch
Package LH, 3-pin Surface Mount
Features and Benefi ts
Package UA, 3-pin SIP
Chopper stabilization
null Superior temperature stability
null Extremely low switchpoint drift
null Insensitive to physical stress
Reverse battery protection
Output short circuit protection
Solid state reliability
Small size
Robust EMC capability
High ESD ratings (HBM)
The A3282 Hall-effect sensor is a temperature stable, stress-resistant latch. Supe-
rior high-temperature performance is made possible through an Allegro
®
pat-
ented dynamic offset cancellation that utilizes chopper-stabilization. This method
reduces the offset voltage normally caused by device overmolding, temperature
dependencies, and thermal stress. The A3282 complements the current Allegro
family of chopper-stabilized latching sensors.
The A3282 includes the following on a single silicon chip: voltage regulator, Hall-
voltage generator, small-signal amplifi er, chopper stabilization, Schmitt trigger,
and a short circuit protected open-drain output. Advanced BiCMOS wafer fabrica-
tion processing is used to take advantage of low-voltage requirements, component
matching, very low input-offset errors, and small component geometries.
This device requires the presence of both south and north polarity magnetic fi elds
for operation. In the presence of a south polarity fi eld of suffi cient strength, the
device output latches on, and only switches off when a north polarity fi eld of suf-
fi cient strength is present.
The A3282 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 two package styles available provide magnetically optimized solutions
for most applications. Package LH is an SOT23W, a miniature low-profi le sur-
face-mount package, while package UA is a three-lead ultramini SIP for through-
hole mounting. Each package is available in a lead (Pb) free version, with 100%
matte tin plated leadframes.
1 32
VCC GND
VOUT
1 2
3
VCC
VOUT
GND
1
2
3
1
2
3