A3230 Datasheet, PDF (1/12 Pages) Allegro MicroSystems – Chopper-Stabilized Hall-Effect Bipolar Switch

A3230
Package LH, 3-pin Surface Mount
3
1
3
2
1
2
Package UA, 3-pin SIP
1
2
3
Chopper-Stabilized
Hall-Effect Bipolar Switch
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 amplifier, 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 field of
sufficient strength and switches off in a north polarity magnetic field of sufficient
strength. Because the output state is not defined if the magnetic field is diminished
or removed, to ensure that the device switches, Allegro recommends using mag-
nets of both polarities and of sufficient 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-profile
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.
123
ABSOLUTE MAXIMUM RATINGS
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
Features and Benefits
Chopper stabilization
Superior temperature stability
Extremely low switchpoint drift
Insensitive to physical stress
Reverse battery protection
A3230-DS
Output short circuit protection
Solid state reliability
Small size
Robust EMC capability
High ESD ratings (HBM)
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com