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
Packages: 3 pin SOT23W (suffix LH), and
3 pin SIP (suffix UA)
Continued on the next page…
Not to scale
Functional Block Diagram
VCC
Regulator
To All Subcircuits
Sample and Hold
Dynamic Offset
Cancellation
Low-Pass
Filter
VOUT
Amp
Control
Current Limit
<1Ω
GND
3230-DS, Rev. 9
A3230
Chopper-Stabilized Hall Effect Bipolar Switch
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.
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.
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
Selection Guide
Part Number
A3230LLHLT-T
2
A3230LUA-T
2
1
Contact Allegro
Packing
1
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
Mounting
3-pin SOT23W surface mount
3-pin SIP through hole
Ambient, T
A
(°C)
–40 to 150
B
RP(MIN)
(G)
–25
B
OP(MAX)
(G)
25
for additional packing options.
2
Variant 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
V
CC
V
RCC
V
OUT
I
OUTSINK
I
ROUT
B
T
A
T
J
(max)
T
stg
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
A3230
Chopper-Stabilized Hall Effect Bipolar Switch
OPERATING CHARACTERISTICS
valid over full operating voltage and ambient temperature ranges, unless otherwise noted
Characteristic
Electrical Characteristics
Supply Voltage
1
Output Leakage Current
Output On Voltage
Output Current Limit
Power-On Time
Chopping Frequency
Output Rise Time
2
Output Fall Time
2
Supply Current
Reverse Battery Current
Supply Zener Clamp Voltage
Supply Zener Current
3
Magnetic Characteristics
4
Operate Point
Release Point
Hysteresis
1
2
Symbol
V
CC
I
OUTOFF
V
OUT(SAT)
I
OM
t
PO
f
c
t
r
t
f
I
CCON
I
CCOFF
I
RCC
V
Z
I
Z
B
OP
B
RP
B
HYS
Test Conditions
Operating, T
J
< 165°C
V
OUT
= 24 V, B < B
RP
I
OUT
= 20 mA, B > B
OP
B > B
OP
V
CC
> 3.6 V
R
LOAD
= 820
Ω,
C
S
= 20 pF
R
LOAD
= 820
Ω,
C
S
= 20 pF
B > B
OP
B < B
RP
V
RCC
= –18 V
I
CC
= 6.5 mA; T
A
= 25°C
V
S
= 28 V
South pole adjacent to branded face of device
North pole adjacent to branded face of device
B
OP
– B
RP
Min.
3.6
–
–
30
–
–
–
–
–
–
–
28
–
–10
–25
5
Typ.
–
–
250
–
8
200
0.2
0.2
1.6
1.6
–
–
–
7.5
–7.5
15
Max.
24
10
500
60
50
–
1
1
3.5
3.5
–2
–
6.5
25
10
25
Units
V
μA
mV
mA
μs
kHz
μs
μs
mA
mA
mA
V
mA
G
G
G
Maximum voltage must be adjusted for power dissipation and junction temperature, see
Power Derating
section.
C
S
= oscilloscope probe capacitance.
3
Maximum current limit is equal to the maximum I
CC(MAX)
+ 3 mA.
4
Magnetic
fl
ux density, B, is indicated as a negative value for north-polarity magnetic
fi
elds, and as a positive value for south-polarity magnetic
fi
elds.
This so-called algebraic convention supports arithmetic comparison of north and south polarity values, where the relative strength of the
fi
eld is indicated
by the absolute value of B, and the sign indicates the polarity of the
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