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A1388 and A1389
Linear Hall-Effect Sensor ICs with Analog Output
Available in a Miniature, Low Profile Surface Mount Package
Features and Benefits
• 5.0 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 A1388 and A1389
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 A1388 and A1389 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 they 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
A13889-DS, Rev. 1
GND

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A1388 and
A1389
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 A1388 and A1389 sensor ICs are are offered in two package
styles. The LH is a SOT-23W style, miniature, low profile package
for surface-mount applications. The UAis 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
Polarity
Sensitivity
(typ) (mV/G)
A1388LLHLX-2-T
Forward
2.5
A1388LUA-2-T
Forward
2.5
A1389LLHLX-9-T
Forward
9
A1389LUA-9-T
Forward
9
A1389LLHLX-RP9-T
Reverse
*Contact Allegrofor additional packing options
–9
Packing*
10,000 pieces per reel
500 pieces per bag
10,000 pieces per reel
500 pieces per bag
10,000 pieces per reel
Package
3-pin SOT-23W surface mount
3-pin SIP through hole
3-pin SOT-23W surface mount
3-pin SIP through hole
3-pin SOT-23W surface mount
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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A1388 and
A1389
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