3163
Suffix 'UA' Pinning
(ultra-mini SIP)
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
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').
Data Sheet
27621.31†
X
1
2
3
Dwg. PH-003-7A
GROUND
GROUND
SUPPLY
FEATURES and BENEFITS
s
s
s
s
s
s
s
s
s
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at T
A
= +25
°
C
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
Internal Current Regulator for 2-Wire Operation
Output Slew Rate Controlled
3.5 V to 24 V Operation … Needs Only An Unregulated Supply
Reverse Battery Protection
Excellent Temperature Stability
Activate with Small, Commercially Available Permanent Magnets
Small Size
Solid-State Reliability … No Moving Parts
Resistant to Physical Stress
Always order by complete part number, e.g.,
A3163ELT .
3163
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
FUNCTIONAL BLOCK DIAGRAM
SUPPLY
REG.
X
GROUND
Dwg. FH-017-1
Suffix 'LT' Pinning
(SOT89/TO-243AA)
800
ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS
700
X
Suffix "UA"
R
θJA
= 165°C/W
600
Suffix "LT"
R
θJA
= 180°C/W
500
400
NC
300
200
1
2
3
100
GROUND
0
20
40
60
100
80
120
AMBIENT TEMPERATURE in
°
C
140
160
180
Dwg. GH-046-6A
Dwg. PH-003-6
Pinning is shown viewed from branded side.
2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2002 Allegro MicroSystems, Inc.
NO (INTERNAL)
CONNECTION
SUPPLY
3163
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
ELECTRICAL CHARACTERISTICS over operating voltage and temperature ranges.
Limits
Characteristic
Supply Voltage
Output Current
Symbol
V
CC
I
OUT(H)
I
OUT(L)
Output Slew Rate
Output Settling Time
Reverse Battery Current
di/dt
t
sd
I
CCR
Test Conditions
Operating
B > B
OP
B < B
RP
C
L
= 20 pF
C
L
= 20 pF
V
RCC
= -16 V
Min.
3.5
12
5.0
—
—
—
Typ.
—
14
5.6
7.0
—
—
Max.
24
17
6.9
20
20
-15
Units
V
mA
mA
mA/µs
µs
mA
MAGNETIC CHARACTERISTICS over operating supply voltage and temperature ranges.
Limits
Characteristic
Operate Point (output turns on)
Release Point (output turns off)
Hysteresis (B
OP
– B
RP
)
Symbol
B
OP
B
RP
B
hys
Min.
–
30
5.0
Typ.
98
79
19
Max.
160
–
40
Units
G
G
G
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).
www.allegromicro.com
3
3163
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
TYPICAL OPERATING CHARACTERISTICS
SWITCH POINTS
120
LOAD CURRENT
20
110
OPERATE POINT, B
OP
V
CC
= 3.5 V
V
CC
= 12 V
V
CC
= 24 V
LOAD CURRENT (I
OUT
) in mA
SWITCH POINTS in GAUSS
100
15
I
OUT(H)
, B > B
OP
V
CC
= 24 V
V
CC
= 12 V
V
CC
= 3.5 V
90
10
80
70
RELEASE POINT, B
RP
V
CC
= 3.5 V
V
CC
= 12 V
V
CC
= 24 V
I
OUT(L)
, B < B
RP
V
CC
= 3.5 V
V
CC
= 12 V
V
CC
= 24 V
5.0
60
50
-50
-25
0
25
50
75
100
125
150
0
-50
-25
0
25
50
75
100
125
150
AMBIENT TEMPERATURE in
°
C
Dwg. GH-044-5
AMBIENT TEMPERATURE in
°
C
Dwg. GH-028-10
4
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
3163
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
SENSOR LOCATIONS
(±0.005" [0.13 mm] die placement)
Suffix “LT”
ACTIVE AREA DEPTH
0.0305"
0.775 mm
NOM
0.088"
2.24 mm
0.045"
1.14 mm
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
.
0.056"
1.44 mm
A
1
2
3
Dwg. MH-008-8A
Suffix “UA”
ACTIVE AREA DEPTH
0.0195"
0.50 mm
NOM
0.080"
2.04 mm
A
BRANDED
SURFACE
1
2
3
+I
Dwg. MH-011-9B
I
OUT(H)
OUTPUT CURRENT
Allegro
B
RP
B
OP
I
OUT(L)
0
0
FLUX DENSITY
+B
Dwg. GH-007-8
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5
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