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A1324, A1325, and A1326
Low Noise, Linear Hall Effect Sensor ICs with Analog Output
Features and Benefits
• Temperature-stable quiescent output voltage and sensitivity
• Output voltage proportional to magnetic flux density
• Low-noise output increases accuracy
• Precise recoverability after temperature cycling
• Ratiometric rail-to-rail output
• Wide ambient temperature range: –40°C to 150°C
• Immune to mechanical stress
• Solid-state reliability
• Enhanced EMC performance for stringent automotive
applications
Packages
3-pin ultramini SIP
1.5 mm × 4 mm × 3 mm
(suffix UA)
3-pin SOT23-W
2 mm × 3 mm × 1 mm
(suffix LH)
Approximate footprint
Description
New applications for linear output Hall-effect devices, such
as displacement, angular position, and current measurement,
require high accuracy in conjunction with small package size.
The AllegroA1324, A1325, and A1326 linear Hall-effect
sensor ICs are designed specifically to achieve both goals. This
temperature-stable device is available in a miniature surface
mount package (SOT23W) and an ultra-mini through-hole
single in-line package.
These ratiometric Hall effect sensor ICs provide a voltage
output that is proportional to the applied magnetic field. They
feature a quiescent voltage output of 50% of the supply voltage.
The A1324/25/26 feature factory programmed sensitivities of
5.0 mV/G, 3.125 mV/G, and 2.5 mV/G, respectively.
The features of these linear devices make them ideal for
use in automotive and industrial applications requiring high
accuracy, and operate through an extended temperature range,
–40°C to 150°C.
Each BiCMOS monolithic circuit integrates a Hall element,
temperature-compensating circuitry to reduce the intrinsic
sensitivity drift of the Hall element, a small-signal high-gain
amplifier, a clamped low-impedance output stage, and a
proprietary dynamic offset cancellation technique.
These devices are available in a 3-pin ultra-mini SIP package
(UA), and a 3-pin surface mount SOT-23 style package (LH). Both
are lead (Pb) free, with 100% matte tin leadframe plating.
V+
VCC
Functional Block Diagram
To All Subcircuits
GND
Sensitivity and
Sensitivity TC
Offset
Trim Control
VOUT
A1324-DS, Rev. 4

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A1324, A1325,
and A1326
Linear Hall Effect Sensor ICs with Analog Output
Selection Guide
Part Number
Packing1
Package
A1324LLHLT-T
3 000 pieces per reel
3-pin SOT-23W surface mount
A1324LLHLX-T 10 000 pieces per reel 3-pin SOT-23W surface mount
A1324LUA-T2
500 pieces per bag
3-pin ultramini SIP through hole mount
A1325LLHLT-T
3 000 pieces per reel
3-pin SOT-23W surface mount
A1325LLHLX-T 10 000 pieces per reel 3-pin SOT-23W surface mount
A1325LUA-T2
500 pieces per bag
3-pin ultramini SIP through hole mount
A1326LLHLT-T
3 000 pieces per reel
3-pin SOT-23W surface mount
A1326LLHLX-T 10 000 pieces per reel 3-pin SOT-23W surface mount
A1326LUA-T2
500 pieces per bag
3-pin ultramini SIP through hole mount
1Contact Allegrofor additional packing options.
2Contact factory for availability.
Absolute Maximum Ratings
Characteristic
Forward Supply Voltage
Reverse Supply Voltage
Forward Output Voltage
Reverse Output Voltage
Output Source Current
Output Sink Current
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
VCC
VRCC
VOUT
VROUT
IOUT(SOURCE)
IOUT(SINK)
TA
TJ(max)
Tstg
Notes
VOUT to GND
VCC to VOUT
L temperature range
Sensitivity (Typ.)
(mV/G)
5.000
3.125
2.500
Rating
8
–0.1
15
–0.1
2
10
–40 to 150
165
–65 to 170
Unit
V
V
V
V
mA
mA
ºC
ºC
ºC
Thermal Characteristics may require derating at maximum conditions, see application information
Characteristic
Symbol
Test Conditions*
Package LH, on 4-layer PCB with copper limited to solder pads
Package Thermal Resistance
RθJA
Package LH, on 2-layer PCB with 0.463 in.2 of copper area each
side, connected by thermal vias
Package UA, on 1-layer PCB with copper limited to solder pads
*Additional thermal information available on the Allegro website
Value Unit
228 ºC/W
110 ºC/W
165 ºC/W
Pin-out Diagrams
3
12
LH Package
12 3
UA Package
Terminal List Table
Name
Number
LH UA
VCC
1
1
VOUT
GND
2
3
3
2
Function
Input power supply; tie to GND with
bypass capacitor
Output signal; also used for
programming
Ground
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2

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A1324, A1325,
and A1326
Linear Hall Effect Sensor ICs with Analog Output
OPERATING CHARACTERISTICS Valid throughout TA range, CBYPASS = 0.1 µF, VCC = 5 V; unless otherwise noted
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Electrical Characteristics
Supply Voltage
Supply Current
Power-On Time2
Supply Zener Clamp Voltage
Internal Bandwidth
Chopping Frequency3
Output Characteristics
VCC
ICC No load on VOUT
tPO TA = 25°C, CL (PROBE) = 10 pF
VZ TA = 25°C, ICC = 12 mA
BWi Small signal, –3 dB
fC TA = 25°C
4.5 5.0 5.5
– 6.9 9
– 32 –
6 8.3 –
– 17 –
– 400 –
Quiescent Voltage Output
Output Referred Noise
Input Referred RMS Noise Density
DC Output Resistance
Output Load Resistance
VOUT(Q)
VN
VNRMS
ROUT
RL
B = 0 G, TA = 25°C
A1324, TA = 25°C, CBYPASS = 0.1 µF
A1325, TA = 25°C, CBYPASS = 0.1 µF
A1326, TA = 25°C, CBYPASS = 0.1 µF
TA = 25°C, CBYPASS = open, no load on VOUT,
f << BWi
VOUT to VCC
VOUT to GND
2.425
4.7
4.7
2.500
7.0
4.4
3.5
1.3
<1
2.575
Output Load Capacitance
Output Saturation Voltage
Magnetic Characteristics
CL
VOUT(sat)HIGH
VOUT(sat)LOW
VOUT to GND
RPULLDOWN = 4.7 kΩ, VCC = 5 V
RPULLUP = 4.7 kΩ, VCC = 5 V
– – 10
4.7 –
– – 0.30
Sensitivity
Sensitivity Temperature Coefficient
Sens
TCSens
A1324, TA = 25°C
A1325, TA = 25°C
A1326, TA = 25°C
LH package; programmed at TA = 150°C,
calculated relative to Sens at 25°C
UA package; programmed at TA = 150°C,
calculated relative to Sens at 25°C
4.750
2.969
2.375
5.000
3.125
2.500
0
0.03
5.250
3.281
2.625
Error Components
Sensitivity Drift at Maximum Ambient
Operating Temperature
LH package; from hot to room temperature
∆Sens(TAmax) UA package; from hot to room temperature
–5 –
–2.5 –
5
7.5
Sensitivity Drift at Minimum Ambient
Operating Temperature
LH package; from cold to room temperature
∆Sens(TAmin) UA package; from cold to room temperature
–3.5 –
–6 –
8.5
4
Unit1
V
mA
µs
V
kHz
kHz
V
mV(p-p)
mV(p-p)
mV(p-p)
mG/√Hz
Ω
nF
V
V
mV/G
mV/G
mV/G
%/°C
%/°C
%
%
%
%
Continued on the next page…
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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