Allegro Multimedia A1321 User Manual
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 responsibility 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
Packages: 3 pin SOT23W (suffix LH), and
3 pin SIP (suffix UA)
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 lowimpedance 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
Not to scale
V+
0.1 μF
VCC
Continued on the next page…
Functional Block Diagram
Amp
Cancellation
Dynamic Offset
Gain
Filter
GND
Out
Offset
Trim
Control
VOUT
A1321-DS, Rev. 23
A1321, A1322,
Ratiometric Linear Hall Effect Sensor ICs
and A1323
for High-Temperature Operation
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
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.
made at end-of-line during the manufacturing process.
Selection Guide
Part Number Packing
A1321ELHLT-T
A1321EUA-T
A1321LLHLT-T
A1321LUA-T
A1322LLHLT-T
A1322LUA-T
A1323EUA-T
A1323LUA-T
1
Contact Allegro for additional packing options.
2
This 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.
2
3
2
3
2
3
3
2
3
7-in. reel, 3000 pieces/reel Surface Mount
Bulk, 500 pieces/bag SIP through hole
7-in. reel, 3000 pieces/reel Surface Mount
Bulk, 500 pieces/bag SIP through hole
7-in. reel, 3000 pieces/reel Surface Mount
Bulk, 500 pieces/bag SIP through hole
Bulk, 500 pieces/bag SIP through hole –40 to 85
7-in. reel, 3000 pieces/reel Surface Mount
Bulk, 500 pieces/bag SIP through hole
1
Mounting
Ambient, TA
(ºC)
–40 to 85
–40 to 150
–40 to 150 3.125
–40 to 150
Sensitivity,
Typ. (mV/G)
5.000
2.500A1323LLHLT-T
Absolute Maximum Ratings
Characteristic Symbol Notes Rating Units
*
Additional current draw may be observed at
Supply Voltage V
Output Voltage V
Reverse Supply Voltage V
Reverse Output Voltage V
Output Sink Current I
Operating Ambient Temperature T
Maximum Junction Temperature TJ(max) 165 ºC
Storage Temperature T
CC
OUT
RCC
ROUT
OUT
A
stg
voltages above the minimum supply Zener
clamp voltage, V
turning on.
Range L –40 to 150 ºC
, due to the Zener diode
Z(min)
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
8V
8V
–0.1 V
–0.1 V
10 mA
–65 to 170 ºC
2
A1321, A1322,
Ratiometric Linear Hall Effect Sensor ICs
and A1323
Package LH
3
for High-Temperature Operation
Pin-out Drawings
Package UA
21
Terminal List
Symbol
VCC 1 1 Connects power supply to chip
VOUT 2 3 Output from circuit
GND 3 2 Ground
Package LH Package UA
Number
231
Description
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3
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