This Hall-effect switch is a monolithic integrated circuit designed to
operate continuously over extended temperatures to +85
C. The unipo-
lar switching characteristic makes this device ideal for use with a simple
bar or rod magnet. The A3163ELT and A3163EUA are identical except
for package.
Each device includes a voltage regulator for operation with supply
voltages of 3.5 to 24 volts, reverse-battery protection, quadratic Hall-
voltage generator for low offset, temperature compensation circuitry,
small-signal amplifier, Schmitt trigger, and a constant-current open-
collector output, wired internally for true 2-wire operation. Noise
radiation is limited by control of the output-current slew rate.
Two package styles provide a magnetically optimized package for
most applications. Suffix `LT' is a miniature SOT89/TO-243AA transis-
tor package for surface-mount applications; suffix `UA' is a three-lead
ultra-mini SIP for through-hole mounting; it is also available with lead
forming for surface-mount applications (suffix 'UA-TL').
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
Always order by complete part number, e.g., A3163ELT .
Data Sheet
27621.31
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at T
A
= +25
C
FEATURES and BENEFITS
s
Internal Current Regulator for 2-Wire Operation
s
Output Slew Rate Controlled
s
3.5 V to 24 V Operation ... Needs Only An Unregulated Supply
s
Reverse Battery Protection
s
Excellent Temperature Stability
s
Activate with Small, Commercially Available Permanent Magnets
s
Small Size
s
Solid-State Reliability ... No Moving Parts
s
Resistant to Physical Stress
3163
Supply Voltage, V
CC
................ 26.5 V
Reverse Battery Voltage, V
RCC
.... -16 V
Magnetic Flux Density, B ..... Unlimited
Package Power Dissipation, P
D
See Graph
Junction Temperature, T
J
....... +170
C
Operating Temperature Range,
T
A
........................ -40
C to +85
C
Storage Temperature Range,
T
S
...................... -65
C to +170
C
X
Dwg. PH-003-7A
1
SUPPLY
GROUND
3
2
GROUND
Suffix 'UA' Pinning
(ultra-mini SIP)
3163
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
2
Pinning is shown viewed from branded side.
X
Dwg. PH-003-6
1
SUPPLY
GROUND
3
2
NO (INTERNAL)
CONNECTION
NC
Suffix 'LT' Pinning
(SOT89/TO-243AA)
Copyright 2002 Allegro MicroSystems, Inc.
FUNCTIONAL BLOCK DIAGRAM
GROUND
REG.
X
SUPPLY
Dwg. FH-017-1
600
400
200
20
60
100
140
0
AMBIENT TEMPERATURE in
C
ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS
Dwg. GH-046-6A
Suffix "UA"
R
JA
= 165
C/W
40
80
120
180
700
500
300
100
160
Suffix "LT"
R
JA
= 180
C/W
800
3163
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
www.allegromicro.com
3
Limits
Characteristic
Symbol
Min.
Typ.
Max.
Units
Operate Point (output turns on)
B
OP
98
160
G
Release Point (output turns off)
B
RP
30
79
G
Hysteresis (B
OP
B
RP
)
B
hys
5.0
19
40
G
Limits
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Supply Voltage
V
CC
Operating
3.5
--
24
V
Output Current
I
OUT(H)
B > B
OP
12
14
17
mA
I
OUT(L)
B < B
RP
5.0
5.6
6.9
mA
Output Slew Rate
di/dt
C
L
= 20 pF
--
7.0
20
mA/
s
Output Settling Time
t
sd
C
L
= 20 pF
--
--
20
s
Reverse Battery Current
I
CCR
V
RCC
= -16 V
--
--
-15
mA
ELECTRICAL CHARACTERISTICS over operating voltage and temperature ranges.
MAGNETIC CHARACTERISTICS over operating supply voltage and temperature ranges.
NOTES: 1. Typical Data is at T
A
= +25
C and V
CC
= 12 V and is for design information only.
2. 1 gauss (G) is exactly equal to 0.1 millitesla (mT).
3163
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
4
SWITCH POINTS
LOAD CURRENT
TYPICAL OPERATING CHARACTERISTICS
0
50
100
AMBIENT TEMPERATURE in
C
-50
Dwg. GH-044-5
SWITCH POINTS in GAUSS
120
100
50
150
-25
25
75
125
80
60
70
90
110
OPERATE POINT, B
OP
V
CC
= 3.5 V
V
CC
= 12 V
V
CC
= 24 V
RELEASE POINT, B
RP
V
CC
= 3.5 V
V
CC
= 12 V
V
CC
= 24 V
0
LOAD CURRENT (I
OUT
) in mA
20
15
0
25
50
75
100
AMBIENT TEMPERATURE in
C
-50
Dwg. GH-028-10
125
-25
150
5.0
10
I
OUT(H)
, B > B
OP
V
CC
= 24 V
V
CC
= 12 V
V
CC
= 3.5 V
I
OUT(L)
, B < B
RP
V
CC
= 3.5 V
V
CC
= 12 V
V
CC
= 24 V
3163
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
www.allegromicro.com
5
FUNCTIONAL DESCRIPTION
Operation. The output of these devices turns on when a
magnetic field (south pole) perpendicular to the Hall
sensor exceeds the operate point threshold (B
OP
). After
turn on, the output will source current (I
OUT(H)
) equal to
the device operating current plus a current source. When
the magnetic field is decreased (south pole) below the
release point (B
RP
), the output will source current (I
OUT(L)
)
equal to the Hall-effect sensor operating current with the
current source turned off. The difference in the magnetic
operate and release points is the hysteresis (B
hys
) of the
device. The hysteresis allows clean switching of the
output even in the presence of external mechanical vibra-
tion or electrical noise.
Powering up in the absence of a magnetic field (less
than B
OP
and higher than B
RP
) will allow an indeterminate
output state. The correct state is warranted after the first
excursion beyond B
OP
or B
RP
.
+B
0
OUTPUT CURRENT
FLUX DENSITY
Dwg. GH-007-8
0
RP
B
I
OUT(L)
I
OUT(H)
OP
B
+I
Suffix "LT"
SENSOR LOCATIONS
(
0.005" [0.13 mm] die placement)
Suffix "UA"
0.045"
1.14 mm
1
3
2
Dwg. MH-008-8A
0.0305"
0.775 mm
NOM
ACTIVE AREA DEPTH
0.088"
2.24 mm
A
1
3
2
Dwg. MH-011-9B
0.0195"
0.50 mm
NOM
BRANDED
SURFACE
ACTIVE AREA DEPTH
0.080"
2.04 mm
0.056"
1.44 mm
A
Allegro
3163
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
6
Extensive applications information for Hall-effect sensors is available in:
Hall-Effect IC Applications Guide, Application Note 27701;
Hall-Effect Devices: Soldering, Gluing, Potting, Encapsulating, and Lead Forming, Application Note 27703.1;
Soldering of Through-Hole Hall-Sensor Dervices, Application Note 27703;
Soldering of Surface-Mount Hall-Sensor Devices, Application Note 27703.2; and
Two-Wire Hall-Effect Sensors, Application Note 27704.
All are provided in Allegro Electronic Data Book, AMS-702 or at
www.allegromicro.com
External Components. It is strongly recommended
that an external bypass capacitor be connected (in close
proximity to the Hall sensor) between the supply and
ground of the device.
Power Derating. Due to the internal device power
dissipation, the junction temperature (T
J
) will be higher
than the ambient temperature (T
A
). To ensure that the
absolute maximum junction temperature is not exceeded,
the following equations should be applied:
T
J
= T
A
+ (P
D
x R
JA
)
where P
D
is the maximum supply power
I
OUT(H)
x V
CC
and R
JA
is the package thermal resistance. The specified
limit for I
OUT(H)
should be used to ensure a margin of
safety.
Magnets. The simplest form of magnet that will operate
this device is a ring magnet. Other methods of operation,
such as linear magnets, are possible.
100
Dwg. EH-011-2A
0.1
F
SUPPLY
X
1
3
2
'UA' PACKAGE
0.95 V
+
APPLICATIONS INFORMATION
TYPICAL APPLICATION
3163
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
www.allegromicro.com
7
Qualification Test
Test Method and Test Conditions
Test Length
Samples
Comments
Biased Humidity (HAST)
T
A
= 130
C, RH = 85%
50 hrs
77
V
CC
= V
OUT
= 5 V
High-Temperature
JESD22-A108,
408 hrs
77
V
CC
= 24 V,
Operating Life (HTOL)
T
A
= 150
C, T
J
165
C
V
OUT
= 20 V
Accelerated HTOL
T
A
= 175
C, T
J
= 190
C
504 hrs
77
V
CC
= 24 V,
V
OUT
= 20 V
Autoclave, Unbiased
JESD22-A102, Condition C,
96 hrs
77
T
A
= 121
C, 15 psig
High-Temperature
MIL-STD-883, Method 1008,
1000 hrs
77
(Bake) Storage Life
T
A
= 170
C
Temperature Cycle
MIL-STD-883, Method 1010,
500 cycles
77
-65
C to +150
C
Latch-Up
--
Pre/Post
6
Reading
Electro-Thermally
--
Pre/Post
6
Induced Gate Leakage
Reading
ESD,
CDF-AEC-Q100-002
Pre/Post
3 per
Test to failure,
Human Body Model
Reading
test
All leads > 4 kV
ESD,
JESD22-A115
Pre/Post
3 per
Test to failure,
Machine Model
Reading
test
All leads >700 V
Electrical Distributions
Per Specification
--
30
All Allegro sensors are subjected to stringent qualification requirements prior to being released to production.
To become qualified, except for the destructive ESD tests, no failures are permitted.
CRITERIA FOR DEVICE QUALIFICATION
3163
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
8
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
PACKAGE DESIGNATOR 'LT'
(SOT89/TO-243AA)
Dimensions in Inches
(for reference only)
Dimensions in Millimeters
(controlling dimensions)
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
3163
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
www.allegromicro.com
9
Dimensions in Inches
(controlling dimensions)
Dimensions in Millimeters
(for reference only)
PACKAGE DESIGNATOR `UA'
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 A3163xUA-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
3163
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
10
The products described herein are manufactured under one or more
of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283;
5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719;
5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents
pending.
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 performance, reliability, or
manufacturability of its products. Before placing an order, the user is
cautioned to verify that the information being relied upon is current.
Allegro products are not authorized for use as critical components
in life-support appliances, devices, or systems without express written
approval.
The information included herein is believed to be accurate and
reliable. However, Allegro MicroSystems, Inc. assumes no responsibil-
ity for its use; nor for any infringements of patents or other rights of
third parties that may result from its use.
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