Pinning is shown viewed from branded side.

ABSOLUTE MAXIMUM RATINGS

Supply Voltage, V

............................. 8 V

Magnetic Flux Density, B ......... Unlimited

Operating Temperature Range,

............................ -20

C to +85

Storage Temperature Range,

........................... -65

C to +150

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

I Extremely Sensitive
I Flat Response to 23 kHz
I Low-Noise Output
I 4.5 V to 6 V Operation
I Magnetically Optimized Package

Dwg. PH-006

SUPPLY

GROUND

OUTPUT

3503
RATIOMETRIC,
LINEAR
HALL-EFFECT SENSORS

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

ELECTRICAL CHARACTERISTICS at T

= +25

C, V

= 5 V

FUNCTIONAL BLOCK DIAGRAM

Dwg. FH-007

GROUND

OUTPUT

REG.

Limits

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Units

Operating Voltage

4.5

6.0

Supply Current

9.0

Quiescent Output Voltage

OUT

B = 0 G

2.25

2.50

2.75

Sensitivity

OUT

B = 0 G to

ą900 G

0.75

1.30

1.75

mV/G

Bandwidth (-3 dB)

kHz

Broadband Output Noise

out

BW = 10 Hz to 10 kHz

ĩV

Output Resistance

OUT

220

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 0.016" (0.41 mm) below the branded face of the `U'
package; 0.020" (0.51 mm) below the branded face of the `UA' package; and 0.030" (0.76 mm) below the branded face of the `LT'
package.

3503

RATIOMETRIC,

LINEAR

HALL-EFFECT SENSORS

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

CC =

AMBIENT TEMPERATURE IN C

OUTPUT

IN VOL

4.0

3.5

3.0

2.5

2.0

1.5

+25

+85

+125

B= +500G

B = 0G

B= -500G

9.0

8.0

7.0

4.5

5.0

5.5

6.0

SUPPLY VOLTAGE IN VOLTS

SUPPL

CURRENT

IN mA

B = 0G

= +25

°C

5.0

4.0

3.0

2.0

1.0

4.5

5.0

5.5

6.0

SUPPLY VOLTAGE IN VOLTS

OUTPUT

NULL

VOL

AGE IN VOL

B = 0G

= +25

°C

= +5V

= +25

°C

8.0

6.0

4.0

2.0

100

10K

FREQUENCY IN H

OUTPUT

NOISE IN

r
ms

Dwg. A-12,507

TA = +25°C

LINEARITY

AND SYMMETR

IN PERCENT

100

4.5

5.0

5.5

6.0

SUPPLY VOLTAGE IN VOLTS

OUTPUT SYMMETRY

LINEARITY

BELOW NULL

LINEAR

ITY ABO

VE NU

B = -900G

B = +900G

= +25

°C

TYPICAL

SENSITIVITY

IN V/G

2.5

2.0

1.5

1.0

0.5

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

NOTCH SENSOR

Dwg. A-12,574

SENSOR LOCATIONS

SUFFIX "U"

Dwg. MH-002-5C

0.015"
0.38 mm

NOM

0.072"

1.83 mm

BRANDED
SURFACE

ACTIVE AREA DEPTH

0.093"

2.37 mm

0.042"
1.08 mm

Dwg. MH-008-9

0.030"
0.76 mm
NOM

ACTIVE AREA DEPTH

0.091"

2.32 mm

Dwg. MH-011-3C

0.018"
0.46 mm
NOM

BRANDED
SURFACE

ACTIVE AREA DEPTH

0.056"

1.43 mm

0.084"

2.13 mm

3503

RATIOMETRIC,

LINEAR

HALL-EFFECT SENSORS

Dimensions in Inches

(for reference only)

Dimensions in Millimeters

(controlling dimensions)

UGN3503LT

(SOT-89/TO-243AA)

NOTE:Exact body and lead configuration at vendor's option within limits shown.

0.098

0.031

0.102

0.047

0.181

0.079

Dwg. MA-012-3 in

Pads 1, 2, 3, and A -- Standard SOT-89 Layout
Pads 1, 2, 3, and B -- Low-Stress Version
Pads 1, 2, and 3 only -- Lowest Stress, But Not Self Aligning

0.028

TYP

0.031

TYP

Dwg. MA-009-3 in

0.064
0.072

0.155
0.167

0.059

BSC

0.014
0.019

0.035
0.047

0.090
0.102

0.055
0.063

0.014
0.017

0.084
0.090

0.017
0.022

0.118

BSC

0.173
0.181

Dwg. MA-009-3 mm

4.40
4.60

1.62
1.83

3.94
4.25

1.50

BSC

0.36
0.48

0.89
1.20

2.29
2.60

1.40
1.60

0.35
0.44

2.13
2.29

0.44
0.56

3.00

BSC

2.5

0.8

2.6

1.2

4.6

2.0

Dwg. MA-012-3 mm

Pads 1, 2, 3, and A -- Standard SOT-89 Layout
Pads 1, 2, 3, and B -- Low-Stress Version
Pads 1, 2, and 3 only -- Lowest Stress, But Not Self Aligning

0.7

TYP

0.8

TYP

Part Number 3503