A3163
Hall Effect Switch for 2-Wire Applications
Not for New Design
These parts are in production but have been determined to be
NOT FOR NEW DESIGN. This classification indicates that sale of
this device is currently restricted to existing customer applications.
The device should not be purchased for new design applications
because obsolescence in the near future is probable. Samples are no
longer available.
Date of status change: April 2003
Recommended Substitutions:
For existing customer transition, and for new customers or new appli-
cations, refer to the
A1143.
NOTE: For detailed information on purchasing options, contact your
local Allegro field applications engineer or sales representative.
Allegro MicroSystems, Inc. reserves the right to make, from time to time, revisions to the anticipated product life cycle plan
for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand. The
information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no respon-
sibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use.
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
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