A1381, A1382, A1383, and A1384
Programmable Linear Hall Effect Sensors with Analog Output
Available in a Miniature Thin Profile Surface Mount Package
Features and Benefits
Description
▪ Customer programmable offset, sensitivity, sensitivity
temperature coefficient, and polarity
▪ Programmability at end-of-line
New applications for linear output Hall effect sensors, such
as displacement, angular position, and current measurement,
require high accuracy in conjunction with small package size.
The Allegro® A138x family of programmable linear Hall
effect sensors was designed specifically to achieve both goals.
These temperature-stable devices are available in a miniature
surface mount package (SOT23-W) and an ultramini through-
hole single-in-line package. The accuracy of these devices is
enhancedviaprogrammabilityontheoutputpinforend-of-line
optimization without the added complexity and cost of a fully
programmable device.
▪ Ratiometric sensitivity, quiescent voltage output, and
clamps for interfacing with application DAC
▪ Temperature-stable quiescent voltage output
and sensitivity
▪ Precise recoverability after temperature cycling
▪ Output voltage clamps provide short circuit
diagnostic capabilities
▪ Wide ambient temperature range: –40°C to 150°C
▪ Immune to mechanical stress
These ratiometric Hall effect sensors provide a voltage output
that is proportional to the applied magnetic field. Both the
quiescent voltage output and magnetic sensitivity are user-
adjustable. The quiescent voltage output can be set around
50%ofthesupplyvoltage,andthesensitivityadjustedbetween
2 mV/G and 9 mV/G over the device family. Programming
selections also exist for output polarity and temperature
compensation. The features of this linear family make it ideal
for high accuracy requirements of automotive and industrial
applications, and performance is guaranteed over an extended
temperature range, –40°C to 150°C.
▪ Miniature package options
Packages
3 pin ultramini SIP
(suffix UA)
3 pin surface mount
SOT23-W (suffix LH)
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Not to scale
Functional Block Diagram
V+
VCC
To all subcircuits
VOUT
(Programming)
Amp
Out
CBYPASS
Hall Drive Circuit
Gain Temperature
Offset
Gain
Coefficient
Trim Control
GND
A1381-DS, Rev. 1