3503
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.
RATIOMETRIC, LINEAR
HALL-EFFECT SENSORS
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.
2
3
Data Sheet
27501B†
V
CC
1
X
GROUND
OUTPUT
SUPPLY
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.
Dwg. PH-006
FEATURES
s
s
s
s
s
Extremely Sensitive
Flat Response to 23 kHz
Low-Noise Output
4.5 V to 6 V Operation
Magnetically Optimized Package
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
Always order by complete part number, e.g.,
UGN3503UA
.
3503
RATIOMETRIC,
LINEAR
HALL-EFFECT SENSORS
FUNCTIONAL BLOCK DIAGRAM
1
V
CC
REG.
X
3
OUTPUT
2
GROUND
Dwg. FH-007
ELECTRICAL CHARACTERISTICS at T
A
= +25
°
C, V
CC
= 5 V
Limits
Characteristic
Operating Voltage
Supply Current
Quiescent Output Voltage
Sensitivity
Bandwidth (-3 dB)
Broadband Output Noise
Output Resistance
Symbol
V
CC
I
CC
V
OUT
∆V
OUT
BW
V
out
R
OUT
BW = 10 Hz to 10 kHz
B=0G
B = 0 G to
±900
G
Test Conditions
Min.
4.5
—
2.25
0.75
—
—
—
Typ.
—
9.0
2.50
1.30
23
90
50
Max.
6.0
13
2.75
1.75
—
—
220
Units
V
mA
V
mV/G
kHz
µV
Ω
All output-voltage measurements are made with a voltmeter having an input impedance of at least 10 kΩ.
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.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1985, 2002 Allegro MicroSystems, Inc.
3503
RATIOMETRIC,
LINEAR
HALL-EFFECT SENSORS
OUTPUT VOLTAGE AS A
FUNCTION OF TEMPERATURE
4.0
OUTPUT NOISE AS A
FUNCTION OF FREQUENCY
10
OUTPUT NOISE IN
µ
Vrms
√H
Z
3.5
V
CC =
5V
B= +500G
8.0
V
CC
= +5V
T
A
= +25°C
6.0
OUTPUT IN VOLTS
3.0
B = 0G
2.5
4.0
2.0
2.0
B= -500G
1.5
0
40
20
0
+25
AMBIENT TEMPERATURE IN C
+85
+125
10
100
FREQUENCY IN H
Z
1K
10K
Dwg. A-12,573
Dwg. A-12,505
SUPPLY CURRENT AS A
FUNCTION OF SUPPLY VOLTAGE
12
11
B = 0G
T
A
= +25°C
DEVICE SENSITIVITY AS A
FUNCTION OF SUPPLY VOLTAGE
2.5
SUPPLY CURRENT IN mA
TYPICAL SENSITIVITY IN V/G
2.0
T
A
= +25°C
10
1.5
9.0
1.0
8.0
0.5
7.0
4.5
5.0
5.5
SUPPLY VOLTAGE IN VOLTS
6.0
0
4.5
5.0
5.5
SUPPLY VOLTAGE IN VOLTS
6.0
Dwg. A-12,506
Dwg. A-12,507
OUTPUT NULL VOLTAGE AS A
FUNCTION OF SUPPLY VOLTAGE
5.0
B = 0G
OUTPUT NULL VOLTAGE IN VOLTS
LINEARITY AND SYMMETRY AS A
FUNCTION OF SUPPLY VOLTAGE
100
LINEARITY AND SYMMETRY IN PERCENT
OUTPUT SYMMETRY
99
4.0
T
A
= +25°C
ITY BELO
LINEAR
G
B = -900
W NULL
3.0
98
VE N
ITY ABO
LINEAR
0G
B = +90
ULL
2.0
97
T
A
= +25°C
96
1.0
0
4.5
5.0
5.5
SUPPLY VOLTAGE IN VOLTS
6.0
95
4.5
5.0
5.5
SUPPLY VOLTAGE IN VOLTS
6.0
Dwg. A-12,508
Dwg.A-12,509
www.allegromicro.com
3503
RATIOMETRIC,
LINEAR
HALL-EFFECT SENSORS
OPERATION
NOTCH SENSOR
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.
Dwg. A-12,574
GEAR TOOTH SENSOR
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.
N
SENSOR LOCATIONS
SUFFIX “U”
ACTIVE AREA DEPTH
0.0165"
0.42 mm
NOM
0.093"
2.37 mm
0.072"
1.83 mm
3 2
1
Dwg. A-12,512
CURRENT MONITOR
A
BRANDED
SURFACE
1
2
3
Dwg. MH-002-5D
SUFFIX “LT”
ACTIVE AREA DEPTH
0.0305"
0.775 mm
NOM
0.091"
2.32 mm
0.042"
1.08 mm
SUFFIX “UA”
ACTIVE AREA DEPTH
0.0195"
0.50 mm
NOM
0.084"
2.13 mm
0.056"
1.43 mm
A
1
2
3
BRANDED
SURFACE
A
1
2
3
Dwg. A-12,513
Dwg. MH-008-9A
Dwg. MH-011-3D
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
3503
RATIOMETRIC,
LINEAR
HALL-EFFECT SENSORS
UGN3503LT
(SOT89/TO-243AA)
Dimensions in Inches
(for reference only)
Dimensions in Millimeters
(controlling dimensions)
0.181
0.173
0.072
0.064
0.167
0.155
0.102
0.090
0.063
0.055
0.0173
0.0138
4.60
4.40
1.83
1.62
4.25
3.94
2.60
2.29
1.60
1.40
0.44
0.35
1
2
3
0.090
0.084
1
2
3
2.29
2.13
0.047
0.035
0.059
BSC
0.0189
0.0142
0.0221
0.0173
0.118
BSC
Dwg. MA-009-3A in
1.20
0.89
1.50
BSC
0.48
0.36
0.56
0.44
3.00
BSC
Dwg. MA-009-3A mm
0.098
0.079
B
A
0.031
0.102
0.181
3 0.047
0.031
TYP
2.5
2.0
B
A
0.8
2.6
4.6
1.2
0.8
TYP
1
0.028
TYP
2
1
0.7
TYP
2
3
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
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
Dwg. MA-012-3 mm
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.
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