Allegro A3508SUA, A3508LUA, A3508EUA, A3507SUA, A3507LUA Datasheet
...
The A3507– and A3508– are sensitive, temperature-stable linear
Hall-effect sensors. Ratiometric, linear Hall-effect sensors provide a
voltage output that is proportional to the applied magnetic field and have
a quiescent output voltage that is approximately 50% of the supply
voltage. These magnetic sensors are ideal for use in linear and rotary
position sensing systems in the harsh environments of automotive and
industrial applications over extended temperatures to -40°C and +150°C.
The two devices are similar except for temperature stability over the
operating temperature range. See the Magnetic Characteristics table for
complete, individual device parametrics.
Each monolithic circuit integrates a quadratic Hall element, improved temperature compensating circuitry to reduce the intrinsic
sensitivity drift of the Hall element, a small-signal high-gain amplifier,
and a rail-to-rail low-impedance output stage. Many problems normally
associated with low-level analog signals are minimized by having the
Hall element and amplifier in a single chip. Output precision is obtained
by internal gain and offset trim adjustments during the manufacturing
process.
The first character of the part number suffix determines the device
operating temperature range: suffix ‘S–’ is for -20
°C to +85°C, suffix
‘E–’ is for -40°C to +85°C, and suffix ‘L–’ is for -40°C to +150°C.
These devices are supplied in a 3-pin ultra-mini-SIP ‘–UA’ package.
FEATURES
■ Output Voltage Proportional to Applied Magnetic Field
■ Ratiometric Rail-to-Rail Output
■ Improved Sensitivity
■ Superior Temperature Stability
■ 4.5 V to 5.5 V Operation
■ Small Package Size
■ Solid-State Reliability
RATIOMETRIC, LINEAR HALL-EFFECT SENSORS
FOR HIGH-TEMPERATURE OPERATION
Data Sheet
27501.1B
3507
AND
3508
Always order by complete part number, e.g., A3507EUA .
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC. . . . . . . . . . . . 6.0 V
Output Voltage, VO. . . . . . . . . . . . . 6.0 V
Output Sink Current, IO. . . . . . . . 5.0 mA
Magnetic Flux Density, B . . . . Unlimited
Package Power Dissipation,
PD. . . . . . . . . . . . . . . . . . . . See Graph
Operating Temperature Range, T
A
Suffix ‘S–’ . . . . . . . . . . . . -20°C to +85°C
Suffix ‘E–’ . . . . . . . . . . . . -40°C to +85°C
Suffix ‘L–’ . . . . . . . . . . . -40°C to +150°C
Storage Temperature Range,
TS. . . . . . . . . . . . . . . -65°C to +170°C
Dwg. PH-006
1
SUPPLY
V
CC
GROUND
32
OUTPUT
X
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
3507
AND
3508
RATIOMETRIC,
LINEAR HALL-EFFECT SENSORS
FOR HIGH-TEMP. OPERATION
600
400
200
20 60 100
140
0
AMBIENT TEMPERATURE in °C
ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS
Dwg. GH-046A
"U" PACKAGE
R
θJA
= 183°C/W
"UA" PACKAGE
R
θJA
= 206°C/W
40 80 120 160
700
500
300
100
V
CC
X
Dwg. FH-011
GROUND
2
OUTPUT
3
1
Copyright © 1994, 2000, Allegro MicroSystems, Inc.
ELECTRICAL CHARACTERISTICS over operating temperature range, at V
CC
= 5 V (unless otherwise
noted).
Limits
Characteristic Symbol Test Conditions Min. Typ. Max. Units
Supply Voltage V
CC
Operating 4.5 5.0 5.5 V
Supply Current I
CC
B = 0, VCC = 5.5 V, IO = 0 – – 10 mA
Quiescent V
OQ
B = 0, IO = 1 mA, TA = 25°C 2.0 2.5 3.0 V
Voltage Output
B = 0, IO = 1 mA 1.8 2.5 3.2 V
Output Voltage V
OH
B = +X*, IO = 1 mA 4.5 4.8 – V
V
OL
B = -X*, IO = -1 mA – 0.2 0.5 V
Bandwidth (-3 dB) BW 20 – – kHz
Output Resistance r
O
–2.510Ω
Wide-Band e
o
B = 0, BW = 10 Hz to 10 kHz, – 125 – µV
Output Noise TA = 25°C
Negative current is defined as coming out of (sourcing) the output.
* This test requires positive and negative fields sufficient to swing the output driver between fully OFF and saturated (ON), respectively. It is NOT intended to indicate a range of linear operation.
FUNCTIONAL BLOCK DIAGRAM
3507
AND
3508
RATIOMETRIC,
LINEAR HALL-EFFECT SENSORS
FOR HIGH-TEMP. OPERATION
www.allegromicro.com
MAGNETIC CHARACTERISTICS over operating temperature range, at V
CC
= 5 V, IO = 1 mA
(unless otherwise noted).
Part Numbers
A3507LUA A3507EUA A3508SUA
Characteristic
*
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Units
Operating Temp. Range, T
A
-40 – +150 -40 – +85 -20 – +85 °C
Sensitivity at TA = 25°C 2.0 2.5 3.0 2.0 2.5 3.0 2.0 2.5 3.0 mV/G
over Oper. Temp. Range 1.7 2.5 3.3 1.7 2.5 3.3 1.7 2.5 3.3 mV/G
∆Sens
(∆T)
†
at TA = Max. -5.0 2.5 10 -6.3 1.2 8.7 -10 – 10 %
at TA = Min. -8.8 -1.3 6.2 -8.8 -1.3 6.2 -10 – 10 %
∆V
OQ(∆T)
‡
––±35 – – ±35 – – ±50 G
Ratiometry, ∆V
OQ(∆V)
– 100 – – 100 – – 100 – %
Ratiometry, ∆Sens
(∆V)
– 100 – – 100 – – 100 – %
Positive Linearity, Lin+ – 100 – – 100 – – 100 – %
Negative Linearity, Lin– – 100 – – 100 – – 100 – %
Symmetry – 100 – – 100 – – 100 – %
Magnetic flux density is measured at most sensitive area of device located 0.018" (0.46 mm) below the branded face of the “UA”
package.
* See Characteristics Definitions for test conditions.
† The nominal sensitivity temperature stability is designed to compensate for the temperature coefficient of samarium-cobalt
magnets (-0.02%/°C).
‡ This calculation (formula 1, next page) yields the device’s equivalent accuracy, over the operating temperature range, in gauss.
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