A1321, A1322, and A1323
Ratiometric Linear Hall Effect Sensor ICs
for High-Temperature Operation
Discontinued Product
This device is no longer in production. The device should not be
purchased for new design applications. Samples are no longer available.
Date of status change: October 31, 2011
• for the A1321EUA-T and the A1321LUA-T use the
A1324LUA-T
• for the A1321ELHLT-T and the A1321LLHLT-T use the
A1324LLHLX-T
• for the A1322LUA-T use the
A1325LUA-T
• for the A1322LLHLT-T use the
A1325LLHLX-T
• for the A1323EUA-T and the A1323LUA-T use the
A1326LUA-T
• for the A1323LLHLT-T use the
A1326LLHLX-T
NOTE: For detailed information on purchasing options, contact your
local Allegro field applications engineer or sales representative.
Allegro MicroSystems, Inc. reserves the right to make, from time to time, revisions to the anticipated product life cycle plan
for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand. The
information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no respon-
sibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use.
A1321, A1322, and A1323
Ratiometric Linear Hall Effect Sensor ICs
for High-Temperature Operation
Features and Benefits
▪
▪
▪
▪
▪
▪
▪
▪
▪
Temperature-stable quiescent output voltage
Precise recoverability after temperature cycling
Output voltage proportional to magnetic flux density
Ratiometric rail-to-rail output
Improved sensitivity
4.5 to 5.5 V operation
Immunity to mechanical stress
Solid-state reliability
Robust EMC protection
Description
The A132X family of linear Hall-effect sensor ICs are optimized,
sensitive, and temperature-stable. These ratiometric Hall-effect
sensor ICs provide a voltage output that is proportional to the
applied magnetic field. The A132X family has a quiescent
output voltage that is 50% of the supply voltage and output
sensitivity options of 2.5 mV/G, 3.125 mV/G, and 5m V/G.
The features of this family of devices are ideal for use in the
harsh environments found in automotive and industrial linear
and rotary position sensing systems.
Each device has a BiCMOS monolithic circuit which integrates
a Hall element, improved temperature-compensating circuitry
to reduce the intrinsic sensitivity drift of the Hall element,
a small-signal high-gain amplifier, and a rail-to-rail low-
impedance output stage.
A proprietary dynamic offset cancellation technique, with
an internal high-frequency clock, reduces the residual offset
voltage normally caused by device overmolding, temperature
dependencies, and thermal stress. The high frequency clock
allows for a greater sampling rate, which results in higher
accuracy and faster signal processing capability. This technique
produces devices that have an extremely stable quiescent output
voltage, are immune to mechanical stress, and have precise
Continued on the next page…
Packages: 3 pin SOT23W (suffix LH), and
3 pin SIP (suffix UA)
Not to scale
Functional Block Diagram
V+
VCC
Dynamic Offset
Cancellation
Filter
Amp
Out
VOUT
Gain
0.1
μF
Offset
Trim
Control
GND
A1321-DS, Rev. 23
A1321, A1322,
and
A1323
Ratiometric Linear Hall Effect Sensor ICs
for High-Temperature Operation
The A132X family is provided in a 3-pin single in-line package
(UA) and a 3-pin surface mount package (LH). Each package is
available in a lead (Pb) free version (suffix, –T) , with a 100% matte
tin plated leadframe.
Description (continued)
recoverability after temperature cycling. Having the Hall element
and an amplifier on a single chip minimizes many problems normally
associated with low-level analog signals.
Output precision is obtained by internal gain and offset trim adjustments
made at end-of-line during the manufacturing process.
Selection Guide
Part Number
A1321ELHLT-T
2
A1321EUA-T
3
A1321LLHLT-T
2
A1321LUA-T
3
A1322LLHLT-T
2
A1322LUA-T
3
A1323EUA-T
3
A1323LLHLT-T
2
A1323LUA-T
3
1
Contact Allegro
2
This
Packing
1
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
Bulk, 500 pieces/bag
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
Mounting
Surface Mount
SIP through hole
Surface Mount
SIP through hole
Surface Mount
SIP through hole
SIP through hole
Surface Mount
SIP through hole
Ambient, T
A
(ºC)
–40 to 85
Sensitivity,
Typ. (mV/G)
5.000
–40 to 150
–40 to 150
–40 to 85
–40 to 150
2.500
3.125
for additional packing options.
variant is in production, however, it has been deemed Pre-End of Life. The product is approaching end of life. Within a minimum of 6 months,
the device will enter its final, Last Time Buy, order phase. Status change: January 31, 2011. Suggested replacements: for the A1321ELHLT-T and
the A1321LLHLT-T use the A1324LLHLX-T, for the A1322LLHLT-T use the A1325LLHLX-T, and for the A1323LLHLT-T use the A1326LLHLX-T.
3
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 change: January 31, 2011.
Absolute Maximum Ratings
Characteristic
Supply Voltage
Output Voltage
Reverse Supply Voltage
Reverse Output Voltage
Output Sink Current
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
*
Additional
Notes
current draw may be observed at
voltages above the minimum supply Zener
clamp voltage, V
Z(min)
, due to the Zener diode
turning on.
Rating
8
8
–0.1
–0.1
10
Units
V
V
V
V
mA
ºC
ºC
ºC
V
CC
V
OUT
V
RCC
V
ROUT
I
OUT
T
A
T
J
(max)
T
stg
Range L
–40 to 150
165
–65 to 170
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2
A1321, A1322,
and
A1323
Ratiometric Linear Hall Effect Sensor ICs
for High-Temperature Operation
Pin-out Drawings
Package LH
3
Package UA
1
2
1
2
3
Terminal List
Symbol
VCC
VOUT
GND
Number
Package LH
Package UA
1
1
2
3
3
2
Description
Connects power supply to chip
Output from circuit
Ground
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3
A1321, A1322,
and
A1323
Ratiometric Linear Hall Effect Sensor ICs
for High-Temperature Operation
Typ.
2
5.0
5.6
2.5
4.7
0.2
–1.5
8.3
30
150
–
–
–
1.5
–
–
Max.
5.5
8
2.575
–
–
–
–
–
–
40
25
20
3
–
10
Units
V
mA
V
V
V
mA
V
kHz
kHz
mV
mV
mV
Ω
kΩ
nF
DEVICE CHARACTERISTICS
1
over operating temperature (T
A
) range, unless otherwise noted
Characteristic
Symbol
Test Conditions
Min.
Electrical Characteristics;
V
CC
= 5 V, unless otherwise noted
Supply Voltage
V
cc(op)
Operating; Tj < 165°C
4.5
Supply Current
I
cc
B = 0, I
out
= 0
–
Quiescent Voltage
V
out(q)
B = 0, T
A
= 25ºC, I
out
= 1 mA
2.425
V
out(H)
B = +X, I
out
= –1 mA
–
Output Voltage
3
B = –X, I
out
= 1 mA
–
V
out(L)
Output Source Current Limit
3
I
out(LM)
B = –X, V
out
→
0
–1.0
Supply Zener Clamp Voltage
V
Z
I
cc
= 11 mA = I
cc(max)
+ 3
6
Output Bandwidth
BW
–
Clock Frequency
f
C
–
Output Characteristics;
over V
CC
range, unless otherwise noted
A1321; C
bypass
= 0.1
μF,
no load
–
Noise, Peak-to-Peak
4
V
N
A1322; C
bypass
= 0.1
μF,
no load
–
A1323; C
bypass
= 0.1
μF,
no load
–
Output Resistance
R
out
I
out
≤
±1 mA
–
Output Load Resistance
R
L
I
out
≤
±1 mA, VOUT to GND
4.7
VOUT to GND
–
Output Load Capacitance
C
L
1
Negative
2
Typical
current is defined as conventional current coming out of (sourced from) the specified device terminal.
data is at T
A
= 25°C. They are for initial design estimations only, and assume optimum manufacturing and application
conditions. Performance may vary for individual units, within the specified maximum and minimum limits.
3
In these tests, the vector
X
is intended to represent positive and negative
fi
elds sufficient to swing the output driver between fully OFF
and saturated (ON), respectively. It is NOT intended to indicate a range of linear operation.
4
Noise specification includes both digital and analog noise.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
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