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A1318 and A1319
Linear Hall-Effect Sensor ICs with Analog Output
Available in a Miniature, Low Profile Surface Mount Package
Features and Benefits
• 3.3 V supply operation
• QVO temperature coefficient programmed at Allegrofor
improved accuracy
• Miniature package options
• High bandwidth, low noise analog output
• High speed chopping scheme minimizes QVO drift across
operating temperature range
• Temperature-stable quiescent voltage output and sensitivity
• Precise recoverability after temperature cycling
• Output voltage clamps provide short circuit diagnostic
capabilities
• Undervoltage lockout (UVLO)
• Wide ambient temperature range: –40°C to 150°C
• Immune to mechanical stress
• Enhanced EMC performance for stringent automotive
applications
Packages
3-pin SOT23-W
2 mm × 3 mm × 1 mm
(suffix LH)
3-pin ultramini SIP
1.5 mm × 4 mm × 3 mm
(suffix UA)
Description
New applications for linear output Hall-effect sensors, such
as displacement and angular position, require higher accuracy
and smaller package sizes. The Allegro A1318 and A1319
linear Hall-effect sensor ICs have been designed specifically to
meet both requirements. These temperature-stable devices are
available in both surface-mount and through hole packages.
The accuracy of each device is enhanced via end-of-line
optimization. Each device features non-volatile memory to
optimize device sensitivity and the quiescent voltage output
(QVO: output in the absence of a magnetic field) for a given
application or circuit. This A1318 and A1319 optimized
performance is sustained across the full operating temperature
range by programming the temperature coefficient for both
sensitivity and QVO at Allegro end-of-line test.
These ratiometric Hall-effect sensor ICs provide a voltage
output that is proportional to the applied magnetic field. The
quiescent voltage output is adjusted around 50% of the supply
voltage.
The features of these linear devices make them ideal for
use in automotive and industrial applications requiring high
accuracy, and operate across an extended temperature range,
–40°C to 150°C.
Each BiCMOS monolithic circuit integrates a Hall element,
temperature-compensating circuitry to reduce the intrinsic
Approximate footprint
Continued on the next page…
V+
VCC
Functional Block Diagram
VOUT
CBYPASS
Sensitivity and
Sensitivity TC
Offset and
Offset TC
A1318-DS, Rev. 1.
GND

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A1318 and
A1319
Linear Hall-Effect Sensor ICs with Analog Output
Available in a Miniature, Low Profile Surface Mount Package
Description (continued)
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.
The A1318 and A1319 sensor ICs are offered in two package styles.
The LH is a SOT-23W style, miniature, low profile package for
surface-mount applications. The UA is a 3-pin, ultra-mini, single
inline package (SIP) for through-hole mounting. Both packages are
lead (Pb) free, with 100% matte tin leadframe plating.
Selection Guide
Part Number
Output Sensitivity
Polarity (typ) (mV/G)
A1318LLHLX-1-T
Forward
1.35
A1318LLHLX-2-T
Forward
2.5
A1318LUA-2-T
Forward
2.5
A1319LLHLX-5-T
Forward
5
A1319LUA-5-T
Forward
*Contact Allegrofor additional packing options
5
Packing*
10,000 pieces per reel
10,000 pieces per reel
500 pieces per bag
10,000 pieces per reel
500 pieces per bag
Package
3-pin SOT-23W surface mount
3-pin SOT-23W surface mount
3-pin SIP through hole
3-pin SOT-23W surface mount
3-pin SIP through hole
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
VOUT to GND
VCC to VOUT
Range L
Notes
Rating
8
–0.1
7
–0.1
2
10
–40 to 150
165
–65 to 170
Unit
V
V
V
V
mA
mA
ºC
ºC
ºC
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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A1318 and
A1319
Linear Hall-Effect Sensor ICs with Analog Output
Available in a Miniature, Low Profile Surface Mount Package
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
Description
Input power supply; tie to
GND with bypass capacitor
Output signal
Ground
THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information
Characteristic
Symbol
Test Conditions
Value Units
Package Thermal Resistance
Package LH, 1-layer PCB with copper limited to solder pads
228 ºC/W
RθJA
Package LH, 2-layer PCB with 0.463 in.2 of copper area each
side connected by thermal vias
110 ºC/W
Package UA, 1-layer PCB with copper limited to solder pads
165 ºC/W
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3

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A1318 and
A1319
Linear Hall-Effect Sensor ICs with Analog Output
Available in a Miniature, Low Profile Surface Mount Package
OPERATING CHARACTERISTICS Valid over TA , CBYPASS = 0.1 µF, VCC = 3.3 V; unless otherwise noted
Characteristic
Symbol
Test Conditions
Min.
Typ.
Electrical Characteristics
Supply Voltage
Undervoltage Threshold2
VCC
VUVLOHI
VUVLOLO
Tested at TA = 25°C and TA = 150°C (device
powers on)
Tested at TA = 25°C and TA = 150°C (device
powers off)
3 3.3
––
2.5 –
Supply Current
Power On Time3,4
VCC Ramp Time3,4
VCC Off Level3,4
Delay to Clamp3,4
Supply Zener Clamp Voltage
Internal Bandwidth4
Chopping Frequency5
Output Characteristics
ICC
tPO
tVCC
VCCOFF
tCLP
VZ
BWi
fC
No load on VOUT
TA = 25°C, CL(PROBE) = 10 pF
TA = 25°C
TA = 25°C
TA = 25°C, CL = 10 nF
TA = 25°C, ICC = 13 mA
Small signal –3 dB
TA = 25°C
0.005
0
6
7.7
50
30
7.3
20
400
Output Referred Noise4
VN
VCC = 3.3 V, TA = 25°C, CBYPASS = open,
Sens = 5 mV/G, no load on VOUT
– 13
Input Referred RMS Noise Density4
DC Output Resistance4
Output Load Resistance4
Output Load Capacitance4
Output Voltage Clamp6
VNRMS
ROUT
RL
CL
VCLPHIGH
VCLPLOW
VCC = 3.3 V, TA = 25°C, CBYPASS = open,
Sens = 5 mV/G, no load on VOUT,
fmeasured << BWi
VOUT to GND
VOUT to GND
TA = 25°C, B = +400 G, RL = 10 kΩ (VOUT to GND)
TA = 25°C, B = –400 G, RL = 10 kΩ (VOUT to VCC)
A1318LLHLX-1-T
4.7
2.842
0.264
1.289
2.3
<1
2.97
0.33
1.35
A1318LLHLX-2-T
2.388
2.5
Sensitivity7
Sens
A1318LUA-2-T
A1319LLHLX-5-T
TA = 25°C
2.388
4.85
2.5
5
A1319LUA-5-T
4.85 5
A1318LLHLX-1-T
1.638
1.65
A1318LLHLX-2-T
1.638
1.65
Quiescent Voltage Output (QVO)
VOUT(Q)
A1318LUA-2-T
A1319LLHLX-5-T
TA = 25°C
1.638
1.635
1.65
1.65
A1319LUA-5-T
1.635
1.65
Max.
3.63
3
10
100
0.33
Unit1
V
V
V
mA
µs
ms
V
µs
V
kHz
kHz
– mV(p-p)
mG/√Hz
10
3.069
0.462
1.411
2.613
2.613
5.15
5.15
1.662
1.662
1.662
1.665
1.665
Ω
nF
V
V
mV/G
mV/G
mV/G
mV/G
mV/G
V
V
V
V
V
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
4

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A1318 and
A1319
Linear Hall-Effect Sensor ICs with Analog Output
Available in a Miniature, Low Profile Surface Mount Package
OPERATING CHARACTERISTICS (continued) Valid over TA , CBYPASS = 0.1 µF, VCC = 3.3 V; unless otherwise noted
Characteristic
Symbol
Test Conditions
Min. Typ. Max.
Unit1
Electrical Characteristics (continued)
A1318LLHLX-1-T
0.08 0.12 0.16
%/°C
Sensitivity Temperature Coefficient
TCSens
A1318LLHLX-2-T
A1318LUA-2-T
A1319LLHLX-5-T
Programmed at TA
= 150°C, calculated
relative to Sens at 25°C
0.08
0.08
0.08
0.12
0.12
0.12
0.16
0.16
0.16
%/°C
%/°C
%/°C
A1319LUA-5-T
0.08 0.12 0.16
%/°C
Error Components
Linearity Sensitivity Error
Symmetry Sensitivity Error
Ratiometry Quiescent Voltage
Output Error8
LinERR
– ±1.5 –
SymERR
– ±1.5 –
RatVOUT(Q)
Across supply voltage range (relative to VCC =
5 V)
±1.5
%
%
%
Ratiometry Sensitivity Error8
RatSens
Across supply voltage range (relative to VCC =
5 V)
±1.5
%
Ratiometry Clamp Error9
Drift Characteristics
RatVOUTCLP
TA = 25°C, across supply voltage range (relative
to VCC = 5 V)
±1.5
%
A1318LLHLX-1-T
–15 – 5 mV
Typical Quiescent Voltage Output Drift
Across Temperature Range
VOUT(Q)
A1318LLHLX-2-T
A1318LUA-2-T
A1319LLHLX-5-T
TA = 150°C
–18 – 8 mV
–13 0 13 mV
–20 – 20 mV
A1319LUA-5-T
–15 0 15 mV
Sensitivity Drift Due to
Package Hysteresis
SensPKG TA = 25°C, after temperature cycling
– ±2 –
%
1 1 G (gauss) = 0.1 mT (millitesla),
2On power-up, the output of the device is held low until VCC exceeds VUVLOHI. After the device is powered, the output remains valid until VCC drops
below VUVLOLO , when the output is pulled low.
3See the Characteristic Definitions section.
4Determined by design and characterization, not evaluated at final test.
5fC varies as much as approximately ±20% across the full operating ambient temperature range and process.
6VCLPLOW and VCLPHIGH scale with VCC due to ratiometry.
7Sensitivity drift through the life of the part, ΔSensLIFE , can have a typical error value ±3% in addition to package hysteresis effects.
8Percent change from actual value at VCC = 3.3 V, for a given temperature.
9Percent change from actual value at VCC = 3.3 V, TA = 25°C.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5