ALLEGRO A1301, A1302 User Manual
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Continuous-Time Ratiometric Linear Hall Effect Sensors
Package LH, 3-pin Surface Mount
1. VCC
2. VOUT
3. GND
Package UA, 3-pin SIP
1. VCC
2. GND
3. VOUT
1
2
1
2
3
A1301 and A1302
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
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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 wellsuited 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. Each package is
available in a lead (Pb) free version (suffix, –T) with 100% matte tin plated leadframe.
AB SO LUTE MAX I MUM RAT INGS
Supply Voltage, VCC............................................8 V
Output Voltage, V
Reverse-Supply Voltage, V
Reverse-Output Voltage, V
Output Sink Current, I
Operating Temperature
Ambient, T
Ambient, T
Maximum Junction, T
Storage Temperature, T
A1301-DS, Rev. 2
.......................................... 8 V
OUT
OUT
, Range E..................–40ºC to 85ºC
A
, Range K ...............–40ºC to 125ºC
A
.......................–0.1 V
RCC
.....................–0.1 V
ROUT
............................. 10 mA
........................165ºC
J(max)
.................. –65ºC to 170ºC
S
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
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1301 and A1302
Continuous-Time Ratiometric Linear Hall Effect Sensors
Product Selection Guide
Part Number Pb-free Packing* Package
A1301ELHLT –
A1301ELHLT-T Yes
A1301EUA –
A1301EUA-T Yes
A1301KLHLT –
A1301KLHLT-T Yes
A1301KUA –
A1301KUA-T Yes
A1302ELHLT –
A1302ELHLT-T Yes
A1302EUA –
A1302EUA-T Yes
A1302KLHLT –
A1302KLHLT-T Yes
A1302KUA –
A1302KUA-T Yes
7-in. tape and reel, 3000 pieces/reel Surface Mount
Bulk, 500 pieces/bag SIP
7-in. tape and reel, 3000 pieces/reel Surface Mount
Bulk, 500 pieces/bag SIP
7-in. tape and reel, 3000 pieces/reel Surface Mount
Bulk, 500 pieces/bag SIP
7-in. tape and reel, 3000 pieces/reel Surface Mount
Bulk, 500 pieces/bag SIP
*Contact Allegro for additional packing options.
Functional Block Diagram
V+
VCC
Ambient, T
A
–40ºC to 85ºC
–40ºC to 125ºC
–40ºC to 85ºC
–40ºC to 125ºC
Sensitivity (Typical)
2.5 mV/G
1.3 mV/G
Voltage
Regulator
Out
Offset
Trim
Control
C
BYPASS
Amp
Gain
Filter
GND
Terminal List
Symbol Description
Package LH Package UA
Number
VCC Connects power supply to chip 1 1
VOUT Output from circuit 2 3
GND Ground 3 2
VOUT
A1301-DS, Rev. 2
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
2
A1301 and A1302
Continuous-Time Ratiometric Linear Hall Effect Sensors
DEVICE CHARACTERISTICS over operating temperature range, T
, and VCC = 5 V, unless otherwise noted
A
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 ∆V
CC
1
Magnetic Sensitivity Error with
respect to ∆V
CC
2
∆V
OUTQ(V)TA
∆Sens
(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(∆TA)
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
(∆TA)
A1302 0.85 – 1.75 mV/G
A1301-DS, Rev. 2
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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