A3230
A3230-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 Bipolar Switch
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 A3230 Hall-effect sensor is a temperature stable, stress-resistant bipolar
switch. This sensor is the most sensitive Hall-effect device in the Allegro
®
bipolar
switch family and is intended for ring-magnet sensing. Superior high-temperature
performance is made possible through an Allegro patented dynamic offset cancel-
lation that utilizes chopper-stabilization. This method reduces the offset voltage
normally caused by device overmolding, temperature dependencies, and thermal
stress.
The A3230 includes the following on a single silicon chip: a voltage regulator,
Hall-voltage generator, small-signal amplifi er, chopper stabilization, Schmitt
trigger, and a short circuit protected open-drain output. Advanced BiCMOS wafer
fabrication processing takes advantage of low-voltage requirements, component
matching, very low input-offset errors, and small component geometries.
The A3230 Hall-effect bipolar switch turns on in a south polarity magnetic fi eld of
suffi cient strength and switches off in a north polarity magnetic fi eld of suffi cient
strength. Because the output state is not defi ned if the magnetic fi eld is diminished
or removed, to ensure that the device switches, Allegro recommends using mag-
nets of both polarities and of suffi cient strength in the application.
The A3230 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. Two A3230 package styles provide magnetically optimized solutions
for most applications. Package LH is a SOT23W, a miniature low-profi le
surface-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