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Allegro MicroSystems

A3230 Datasheet Preview

A3230 Datasheet

Chopper-Stabilized Hall-Effect Bipolar Switch

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A3230
Chopper-Stabilized Hall-Effect Bipolar Switch
Features and Benefits
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), and
3 pin SIP (suffix UA)
Description
The A3230 Hall-effect sensor IC is a temperature stable,
stress-resistant bipolar switch. This device is the most sensitive
Hall-effect device in the Allegrobipolar switch family and is
intended for ring-magnet sensing. Superior high-temperature
performance is made possible through an Allegro
dynamic offset cancellation 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
Not to scale
Continued on the next page…
Functional Block Diagram
VCC
Amp
Regulator
To All Subcircuits
Control
Current Limit
VOUT
<1Ω
3230-DS, Rev. 9
GND




Allegro MicroSystems

A3230 Datasheet Preview

A3230 Datasheet

Chopper-Stabilized Hall-Effect Bipolar Switch

No Preview Available !

A3230
Chopper-Stabilized Hall Effect Bipolar Switch
Description (continued)
diminished or removed, to ensure that the device switches, Allegro
recommends using magnets of both polarities and of sufficient
strength in the application.
TheA3230 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 SOT23-W, 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.
Selection Guide
Part Number
Packing1
Mounting
Ambient, TA BRP(MIN) BOP(MAX)
(°C) (G) (G)
A3230LLHLT-T2 7-in. reel, 3000 pieces/reel
A3230LUA-T2 Bulk, 500 pieces/bag
3-pin SOT23W surface mount
3-pin SIP through hole
–40 to 150
–25
25
1Contact Allegro for additional packing options.
2Variant is in production but has been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of the variant is currently
restricted to existing customer applications. The variant should not be purchased for new design applications because obsolescence in the near future is
probable. Samples are no longer available. Status date change January 30, 2012.
Absolute Maximum Ratings
Characteristic
Supply Voltage
Reverse Supply Voltage
Output Off Voltage
Output Current
Reverse-Output Current
Magnetic Flux Density
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
VCC
VRCC
VOUT
IOUTSINK
IROUT
B
TA
TJ(max)
Tstg
Range E
Range L
Notes
Rating
28
–18
26.5
Internally Limited
–10
Unlimited
–40 to 85
–40 to 150
165
–65 to 170
Units
V
V
V
mA
G
ºC
ºC
ºC
ºC
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2


Part Number A3230
Description Chopper-Stabilized Hall-Effect Bipolar Switch
Maker Allegro MicroSystems
Total Page 13 Pages
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