The A3361x and A3362x Hall-effect switches are extremely
temperature-stable and stress-resistant sensors. Superior performance
over temperature is made possible through dynamic offset cancellation,
which reduces the residual offset voltage normally caused by device
overmolding, temperature dependencies, and thermal stress. The two
devices differ only in output polarity; the A3361x output current goes
low in the presence of a south pole of sufficient strength; the A3362x
output current goes high.
Each device includes on a single silicon chip a voltage regulator,
Hall-voltage generator, small-signal amplifier, chopper stabilization,
Schmitt trigger, and a constant-current open-collector output. An
on-board regulator permits operation with supply voltages of 3.5 to 24
volts. Noise radiation is limited by control of the output current slew
rate.
Three package styles provide a magnetically optimized package for
most applications. Suffix `xLH' is a miniature low-profile surface-
mount package, `xLT' is a miniature SOT-89/TO-243AA transistor
package for surface-mount applications; while suffix `xUA' is a three-
lead ultra-mini-SIP for through-hole mounting.
FEATURES
I Internal Current Regulator for 2-Wire Operation
I Resistant to Physical Stress
I Superior Temperature Stability
I Operation From Unregulated Supply
I Solid-State Reliability
I Small Size
Always order by complete part number: the prefix 'A' + the basic four-digit
part number + a suffix to indicate operating temperature range (E) +
a two-letter suffix to indicate package style, e.g., A3361ELH .
2-WIRE, CHOPPER-STABILIZED,
HALL-EFFECT SWITCHES
Suffix Code 'LH' Pinning
ABSOLUTE MAXIMUM RATINGS
at T
A
=+25
C
NC
X
SUPPLY
GROUND
1
2
3
Dwg. PH-003-5
NO (INTERNAL)
CONNECTION
Pinning is shown viewed from branded side.
3361
AND
3362
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
PRELIMINARY INFORMATION
(subject to change without notice)
August 28, 2000
Data Sheet
27621.50
3361
AND
3362
2-WIRE,
CHOPPER-STABILIZED,
HALL-EFFECT SWITCHES
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
2
FUNCTIONAL BLOCK DIAGRAM
Copyright 2000, Allegro MicroSystems, Inc.
Dwg. FH-020-6
X
DYNAMIC
OFFSET CANCELLATION
SUPPLY
REG.
SAMPLE
& HOLD
LOW-PASS
FILTER
TO ALL
SUBCIRCUITS
GROUND
Pinning is shown viewed from branded side.
X
Dwg. PH-003-6
1
SUPPLY
GROUND
3
2
NO (INTERNAL)
CONNECTION
NC
X
Dwg. PH-003-7A
1
SUPPLY
GROUND
3
2
GROUND
Suffix Code 'UA' Pinning
(SIP)
Suffix Code 'LT' Pinning
(SOT-89/TO-243AA)
3361
AND
3362
2-WIRE,
CHOPPER-STABILIZED,
HALL-EFFECT SWITCHES
www.allegromicro.com
3
A3361 MAGNETIC CHARACTERISTICS over operating supply voltage and temperature ranges.
Limits
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Operate Point
B
OP
B > B
OP
, I
GND
= LOW
125
G
Release Point
B
RP
B < B
RP
, I
GND
= HIGH
40
G
Hysteresis
B
hys
B
OP
- B
RP
5.0
30
G
A3362 MAGNETIC CHARACTERISTICS over operating supply voltage and temperature ranges.
Limits
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Operate Point
B
OP
B > B
OP
, I
GND
= HIGH
125
G
Release Point
B
RP
B < B
RP
, I
GND
= LOW
40
G
Hysteresis
B
hys
B
OP
- B
RP
5.0
30
G
ELECTRICAL CHARACTERISTICS over operating temperature range.
Limits
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Supply Voltage
V
CC
Operating
3.5
12
24
V
Output Current
I
GND(L)
Output Current Low
5.0
6.9
mA
I
GND(H)
Output Current High
12
17
mA
Chopping Frequency
f
C
340
kHz
Output Settling Time
t
sd
C
L
= 20 pF
50
s
Output Rise Time
t
r
C
L
= 20 pF
3.5
s
Output Fall Time
t
f
C
L
= 20 pF
3.5
s
Reverse Battery Current
I
CC
V
RCC
= -16 V
-15
mA
NOTE: Typical Data is at T
A
= +25
C and V
CC
= 12 V and is for design information only.
3361
AND
3362
2-WIRE,
CHOPPER-STABILIZED,
HALL-EFFECT SWITCHES
www.allegromicro.com
5
SENSOR LOCATIONS
(
0.005" [0.13 mm] die placement)
Package Designator "LH"
Package Designators "UA" and "UA-TL"
Although sensor location is accurate to three sigma for a
particular design, product improvements may result in small
changes to sensor location.
0.038"
0.96 mm
1
2
Dwg. MH-025
0.011"
0.28 mm
NOM
ACTIVE AREA DEPTH
0.059"
1.49 mm
A
3
0.045"
1.14 mm
1
3
2
Dwg. MH-008-8
0.030"
0.76 mm
NOM
ACTIVE AREA DEPTH
0.088"
2.24 mm
A
1
3
2
Dwg. MH-011-9A
0.018"
0.46 mm
NOM
BRANDED
SURFACE
ACTIVE AREA DEPTH
0.080"
2.04 mm
0.056"
1.44 mm
A
Package Designator "LT"
600
400
200
20
60
100
140
0
AMBIENT TEMPERATURE in
C
ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS
Dwg. GH-046-4
Suffix "UA"
R
JA
= 206
C/W
40
80
120
180
700
500
300
100
160
Suffix "LT"
R
JA
= 258
C/W
Suffix "LH"
R
JA
= 248
C/W
Allegro
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