Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
CC
............................. 8 V
Magnetic Flux Density, B ......... Unlimited
Operating Temperature Range,
T
A
............................ -20
C to +85
C
Storage Temperature Range,
T
S
........................... -65
C to +150
C
RATIOMETRIC, LINEAR
HALL-EFFECT SENSORS
The UGN3503LT, UGN3503U, and UGN3503UA Hall-effect
sensors accurately track extremely small changes in magnetic flux
density--changes generally too small to operate Hall-effect switches.
As motion detectors, gear tooth sensors, and proximity detectors,
they are magnetically driven mirrors of mechanical events. As sensitive
monitors of electromagnets, they can effectively measure a system's
performance with negligible system loading while providing isolation
from contaminated and electrically noisy environments.
Each Hall-effect integrated circuit includes a Hall sensing element,
linear amplifier, and emitter-follower output stage. Problems associated
with handling tiny analog signals are minimized by having the Hall cell
and amplifier on a single chip.
Three package styles provide a magnetically optimized package for
most applications. Package suffix `LT' is a miniature SOT-89/TO-
243AA transistor package for surface-mount applications; suffix `U' is a
miniature three-lead plastic SIP, while `UA' is a three-lead ultra-mini-
SIP. All devices are rated for continuous operation over the temperature
range of -20
C to +85
C.
Data Sheet
27501B
3503
Always order by complete part number, e.g., UGN3503UA .
FEATURES
s Extremely Sensitive
s Flat Response to 23 kHz
s Low-Noise Output
s 4.5 V to 6 V Operation
s Magnetically Optimized Package
Dwg. PH-006
1
SUPPLY
V
CC
GROUND
3
2
OUTPUT
X
3503
RATIOMETRIC,
LINEAR
HALL-EFFECT SENSORS
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
ELECTRICAL CHARACTERISTICS at T
A
= +25
C, V
CC
= 5 V
FUNCTIONAL BLOCK DIAGRAM
V
CC
X
Dwg. FH-007
GROUND
OUTPUT
3
2
REG.
1
Limits
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Operating Voltage
V
CC
4.5
--
6.0
V
Supply Current
I
CC
--
9.0
13
mA
Quiescent Output Voltage
V
OUT
B = 0 G
2.25
2.50
2.75
V
Sensitivity
V
OUT
B = 0 G to
900 G
0.75
1.30
1.75
mV/G
Bandwidth (-3 dB)
BW
--
23
--
kHz
Broadband Output Noise
V
out
BW = 10 Hz to 10 kHz
--
90
--
V
Output Resistance
R
OUT
--
50
220
Copyright 1985, 2002 Allegro MicroSystems, Inc.
All output-voltage measurements are made with a voltmeter having an input impedance of at least 10 k
.
Magnetic flux density is measured at most sensitive area of device located 0.0165" (0.42 mm) below the branded face of the `U'
package; 0.0195" (0.50 mm) below the branded face of the `UA' package; and 0.0305" (0.775 mm) below the branded face of the
`LT' package.
3503
RATIOMETRIC,
LINEAR
HALL-EFFECT SENSORS
www.allegromicro.com
SUPPLY CURRENT AS A
FUNCTION OF SUPPLY VOLTAGE
DEVICE SENSITIVITY AS A
FUNCTION OF SUPPLY VOLTAGE
OUTPUT NULL VOLTAGE AS A
FUNCTION OF SUPPLY VOLTAGE
LINEARITY AND SYMMETRY AS A
FUNCTION OF SUPPLY VOLTAGE
OUTPUT VOLTAGE AS A
FUNCTION OF TEMPERATURE
OUTPUT NOISE AS A
FUNCTION OF FREQUENCY
Dwg. A-12,573
Dwg. A-12,505
Dwg. A-12,506
Dwg.A-12,509
Dwg. A-12,508
V
CC =
5V
AMBIENT TEMPERATURE IN C
OUTPUT
IN VOL
TS
4.0
3.5
3.0
2.5
2.0
1.5
40
20
0
+25
+85
+125
B= +500G
B = 0G
B= -500G
12
11
10
9.0
8.0
7.0
4.5
5.0
5.5
6.0
SUPPLY VOLTAGE IN VOLTS
SUPPL
Y
CURRENT
IN mA
B = 0G
T
A
= +25
C
5.0
4.0
3.0
2.0
1.0
0
4.5
5.0
5.5
6.0
SUPPLY VOLTAGE IN VOLTS
OUTPUT
NULL
VOL
T
AGE IN VOL
TS
B = 0G
T
A
= +25
C
V
CC
= +5V
T
A
= +25
C
10
8.0
6.0
4.0
2.0
0
10
100
1K
10K
FREQUENCY IN H
Z
OUTPUT
NOISE IN
V
rms
H
Z
Dwg. A-12,507
TA = +25
C
LINEARITY
AND SYMMETR
Y
IN PERCENT
100
99
98
97
96
95
4.5
5.0
5.5
6.0
SUPPLY VOLTAGE IN VOLTS
OUTPUT SYMMETRY
LINEARITY
BELOW NULL
LINEARITY
ABOVE
NULL
B = -900G
B = +900G
T
A
= +25
C
TYPICAL
SENSITIVITY
IN V/G
2.5
2.0
1.5
1.0
0.5
0
4.5
5.0
5.5
6.0
SUPPLY VOLTAGE IN VOLTS
3503
RATIOMETRIC,
LINEAR
HALL-EFFECT SENSORS
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
GEAR TOOTH SENSOR
CURRENT MONITOR
OPERATION
The output null voltage (B = 0 G) is nominally one-half the supply
voltage. A south magnetic pole, presented to the branded face of the Hall-
effect sensor will drive the output higher than the null voltage level. A north
magnetic pole will drive the output below the null level.
In operation, instantaneous and proportional output-voltage levels are
dependent on magnetic flux density at the most sensitive area of the device.
Greatest sensitivity is obtained with a supply voltage of 6 V, but at the cost of
increased supply current and a slight loss of output symmetry. The sensor's
output is usually capacitively coupled to an amplifier that boosts the output
above the millivolt level.
In two applications shown, a permanent bias magnet is attached with
epoxy glue to the back of the epoxy package. The presence of ferrous material
at the face of the package acts as a flux concentrator.
The south pole of a magnet is attached to the back of the package if the
Hall-effect IC is to sense the presence of ferrous material. The north pole of a
magnet is attached to the back surface if the integrated circuit is to sense the
absence of ferrous matrial.
Calibrated linear Hall devices, which can be used to determine the actual
flux density presented to the sensor in a particular application, are available.
SUFFIX "LT"
SUFFIX "UA"
Dwg. A-12,513
Dwg. A-12,512
N
3
1
2
NOTCH SENSOR
Dwg. A-12,574
SENSOR LOCATIONS
SUFFIX "U"
A
1
3
Dwg. MH-002-5D
0.0165"
0.42 mm
NOM
0.072"
1.83 mm
BRANDED
SURFACE
ACTIVE AREA DEPTH
2
0.093"
2.37 mm
0.042"
1.08 mm
1
3
2
Dwg. MH-008-9A
0.0305"
0.775 mm
NOM
ACTIVE AREA DEPTH
0.091"
2.32 mm
A
1
3
Dwg. MH-011-3D
0.0195"
0.50 mm
NOM
BRANDED
SURFACE
ACTIVE AREA DEPTH
2
0.056"
1.43 mm
A
0.084"
2.13 mm
3503
RATIOMETRIC,
LINEAR
HALL-EFFECT SENSORS
www.allegromicro.com
Dimensions in Inches
(for reference only)
Dimensions in Millimeters
(controlling dimensions)
UGN3503LT
(SOT89/TO-243AA)
Dwg. MA-009-3A in
1
2
3
0.072
0.064
0.167
0.155
0.059
BSC
0.0189
0.0142
0.047
0.035
0.102
0.090
0.063
0.055
0.0173
0.0138
0.090
0.084
0.0221
0.0173
0.118
BSC
0.181
0.173
Dwg. MA-009-3A mm
1
2
3
4.60
4.40
1.83
1.62
4.25
3.94
1.50
BSC
0.48
0.36
1.20
0.89
2.60
2.29
1.60
1.40
0.44
0.35
2.29
2.13
0.56
0.44
3.00
BSC
NOTES: 1.
Exact body and lead configuration at vendor's option within limits shown.
2.
Supplied in bulk pack (500 pieces per bag) or add "TR" to part number for tape and reel.
3.
Only low-temperature (
240
C) reflow-soldering techniques are recommended for SOT89 devices.
1
B
0.098
0.031
0.102
0.047
0.181
0.079
Dwg. MA-012-3 in
Pads 1, 2, 3, and A -- Standard SOT89 Layout
Pads 1, 2, 3, and B -- Low-Stress Version
Pads 1, 2, and 3 only -- Lowest Stress, But Not Self Aligning
2
0.028
TYP
0.031
TYP
A
3
1
3
B
2.5
0.8
2.6
1.2
4.6
2.0
Dwg. MA-012-3 mm
Pads 1, 2, 3, and A -- Standard SOT89 Layout
Pads 1, 2, 3, and B -- Low-Stress Version
Pads 1, 2, and 3 only -- Lowest Stress, But Not Self Aligning
2
0.7
TYP
0.8
TYP
A
3503
RATIOMETRIC,
LINEAR
HALL-EFFECT SENSORS
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Dimensions in Inches
(controlling dimensions)
Dimensions in Millimeters
(for reference only)
Dwg. MH-003E in
0.063
0.059
0.018
0.0173
0.0138
0.0189
0.0142
0.050
1
2
3
0.100
45
SEE NOTE
0.183
0.178
0.181
0.176
0.600
0.560
0.086
MAX
UGN3503U
Dwg. MH-003E mm
1.60
1.50
0.46
0.44
0.35
0.48
0.36
1.27
1
2
3
2.54
45
SEE NOTE
4.65
4.52
4.60
4.47
15.24
14.23
2.18
MAX
NOTES: 1. Tolerances on package height and width represent allowable mold offsets.
Dimensions given are measured at the widest point (parting line).
2. Exact body and lead configuration at vendor's option within limits shown.
3. Height does not include mold gate flash.
4. Recommended minimum PWB hole diameter to clear transition area is 0.035" (0.89 mm).
5. Minimum lead length was 0.500" (12.70 mm). If existing product to the original specifications is not acceptable,
contact sales office before ordering.
Devices in the `U' package are
NOT RECOMMENDED FOR NEW DESIGN
3503
RATIOMETRIC,
LINEAR
HALL-EFFECT SENSORS
www.allegromicro.com
Dimensions in Inches
(controlling dimensions)
Dimensions in Millimeters
(for reference only)
UGN3503UA
NOTES: 1.
Tolerances on package height and width represent
allowable mold offsets. Dimensions given are
measured at the widest point (parting line).
2.
Exact body and lead configuration at vendor's option
within limits shown.
3.
Height does not include mold gate flash.
4.
Recommended minimum PWB hole diameter to clear
transition area is 0.035" (0.89 mm).
5.
Where no tolerance is specified, dimension is nominal.
6.
Supplied in bulk pack (500 pieces per bag).
Dwg. MH-014E in
0.164
0.159
0.062
0.058
0.0173
0.0138
0.050
BSC
45
0.640
0.600
0.0189
0.0142
0.085
MAX
45
0.031
1
2
3
0.122
0.117
SEE NOTE
Dwg. MH-014E mm
4.17
4.04
1.57
1.47
0.44
0.35
1.27
BSC
45
16.26
15.24
0.48
0.36
2.16
MAX
45
0.79
1
2
3
3.10
2.97
SEE NOTE
Radial Lead Form (order UGN3503UA-LC)
NOTE:
Lead-form dimensions are the nominals produced on the
forming equipment. No dimensional tolerance is implied or
guaranteed for bulk packaging (500 pieces per bag).
0.620"
0.500"
(15.7 mm
12.7 mm)
0.100"
(2.5 mm)
Dwg. MH-026
0.108"
(2.74 mm)
1
2
3
3503
RATIOMETRIC,
LINEAR
HALL-EFFECT SENSORS
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Allegro MicroSystems, Inc. reserves the right to make, from time to
time, such departures from the detail specifications as may be
required to permit improvements in the design of its products.
The information included herein is believed to be accurate and
reliable. However, Allegro MicroSystems, Inc. assumes no responsi-
bility for its use; nor for any infringements of patents or other rights of
third parties which may result from its use.
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