Allegro Multimedia A1302, A1301 User Manual
A1301 and A1302
Amp
GND
VOUT
VCC
Out
Offset
Tri m
Control
Gain
V+
Vol ta ge
Regulator
Filter
C
BYPASS
Continuous-T ime Ratiometric Linear Hall Effect Sensors
Features and Benefits
▪ Low-noise output
▪ Fast power-on time
▪ Ratiometric rail-to-rail output
▪ 4.5 to 6.0 V operation
▪ Solid-state reliability
▪ Factory-programmed at end-of-line for optimum
performance
▪ Robust ESD performance
Packages: 3 pin SOT23W (suffix LH), and
3 pin SIP (suffix UA)
Not to scale
Description
The A1301 and A1302 are continuous-time, ratiometric, linear
Hall-effect sensors. They are optimized to accurately provide
a voltage output that is proportional to an applied magnetic
field. These devices have a quiescent output voltage that is
50% of the supply voltage. Two output sensitivity options are
provided: 2.5 mV/G typical for the A1301, and 1.3 mV/G
typical for the A1302.
The Hall-effect integrated circuit included in each device
includes a Hall sensing element, a linear amplifier, and a
CMOS Class A output structure. Integrating the Hall sensing
element and the amplifier on a single chip minimizes many
of the problems normally associated with low voltage level
analog signals.
High precision in output levels is obtained by internal gain
and offset trim adjustments made at end-of-line during the
manufacturing process.
These features make the A1301 and A1302 ideal for use in
position sensing systems, for both linear target motion and
rotational target motion. They are well-suited for industrial
applications over extended temperature ranges, from –40°C
to 125°C.
Two device package types are available: LH, a 3-pin SOT23W
type for surface mount, and UA, a 3-pin ultramini SIP for
through-hole mount. They are lead (Pb) free (suffix, –T) with
100% matte tin plated leadframes.
A1301-DS, Rev. 5
Functional Block Diagram
A1301 and
Continuous-T ime Ratiometric
A1302
Linear Hall Effect Sensors
Selection Guide
Part Number Pb-free
A1301ELHLT-T Yes 7-in. tape and reel, 3000 pieces/reel Surface Mount
A1301EUA-T Yes Bulk, 500 pieces/bag SIP
A1301KLHLT-T Yes 7-in. tape and reel, 3000 pieces/reel Surface Mount
A1301KUA-T Yes Bulk, 500 pieces/bag SIP
A1302ELHLT-T Yes 7-in. tape and reel, 3000 pieces/reel Surface Mount
A1302EUA-T Yes Bulk, 500 pieces/bag SIP
A1302KLHLT-T Yes 7-in. tape and reel, 3000 pieces/reel Surface Mount
A1302KUA-T Yes Bulk, 500 pieces/bag SIP
1
Pb-based variants are being phased out of the product line. Certain variants cited in this footnote are no longer in production The variants should
not be purchased for new design applications. Samples are no longer available. Status change: May 1, 2006. These variants include: A1301ELHLT,
A1301EUA, A1301KLHLT, A1301KUA, A1302ELHLT, A1302EUA, A1302KLHLT, and A1302KUA.
2
Contact Allegro for additional packing options.
1
Packing
2
Package
Ambient, T
–40ºC to 85ºC
–40ºC to 125ºC
–40ºC to 85ºC
–40ºC to 125ºC
A
Sensitivity (Typical)
2.5 mV/G
1.3 mV/G
Absolute Maximum Ratings
Characteristic Symbol Notes Rating Units
Supply Voltage V
Output Voltage V
Reverse Supply Voltage V
Reverse Supply Voltage V
Output Sink Current I
Operating Ambient Temperature T
Maximum Junction Temperature TJ(max) 165 ºC
Storage Temperature T
CC
OUT
RCC
RCC
OUT
stg
A
Range E –40 to 85 ºC
Range K –40 to 125 ºC
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
8V
8V
–0.1 V
–0.1 V
10 mA
–65 to 170 ºC
2
A1301 and
Continuous-T ime Ratiometric
A1302
DEVICE CHARACTERISTICS over operating temperature range, T
, and VCC = 5 V, unless otherwise noted
A
Linear Hall Effect Sensors
Characteristic Symbol Test Conditions Min. Typ. Max. Units
Electrical Characteristics
Supply Voltage V
Supply Current I
V
Output Voltage
OUT(High)ISOURCE
V
OUT(Low)ISINK
CC
CC
Running, TJ < 165°C 4.5 – 6 V
Output open – – 11 mA
= –1 mA, Sens = nominal 4.65 4.7 – V
= 1 mA, Sens = nominal – 0.2 0.25 V
Output Bandwidth BW – 20 – kHz
Power-On Time t
Output Resistance R
Wide Band Output Noise, rms V
PO
OUT
OUTN
V
Slew rate = 4.5 V/μs to 4.5 V/100 ns
I
External output low pass filter ≤ 10 kHz;
Sens = nominal
CC(min)
SINK
to 0.95 V
≤ 1 mA, I
OUT;
SOURCE
B = ±1400 G;
–35μs
≥ –1 mA – 2 5 Ω
– 150 – μV
Ratiometry
Quiescent Output Voltage Error
with respect to ΔV
CC
1
Magnetic Sensitivity Error with
respect to ΔV
CC
2
ΔV
OUTQ(V)TA
ΔSens
(V)TA
= 25°C – – ±3.0 %
= 25°C – – ±3.0 %
Output
Linearity Lin TA = 25°C – – ±2.5 %
Symmetry Sym TA = 25°C – – ±3.0 %
Magnetic Characteristics
Quiescent Output Voltage V
Quiescent Output Voltage over
Operating Temperature Range
OUTQ
V
OUTQ(ΔTA)
Magnetic Sensitivity Sens
Magnetic Sensitivity over
Operating Temperature Range
1
Refer to equation (4) in Ratiometric section on page 4.
2
Refer to equation (5) in Ratiometric section on page 4.
Sens
B = 0 G; TA = 25°C 2.4 2.5 2.6 V
B = 0 G 2.2 – 2.8 V
A1301; T
A1302; T
= 25°C 2.0 2.5 3.0 mV/G
A
= 25°C 1.0 1.3 1.6 mV/G
A
A1301 1.8 – 3.2 mV/G
(ΔTA)
A1302 0.85 – 1.75 mV/G
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
3
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