The A3260-- Hall-effect bipolar switch is an extremely
temperature-stable and stress-resistant sensor especially suited for
operation over extended temperature ranges to +150
C. Superior
high-temperature performance is made possible through dynamic
offset cancellation, which reduces the residual offset voltage normally
caused by device overmolding, temperature dependencies, and thermal
stress.
The 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. A south
pole of sufficient strength will turn the output OFF. 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.
The first character of the part number suffix determines the device
operating temperature range; suffix `E' is -40
C to +85
C and `L' is
-40
C to +150
C. Three package styles provide a magnetically opti-
mized package for most applications. Suffix `LH' is a miniature
SOT23W low-profile surface-mount package, `LT' is a miniature
SOT89/TO-243AA transistor package for surface-mount applications;
while suffix `UA' is a three-lead ultra-mini-SIP for through-hole
mounting.
Data Sheet
27631.50
FEATURES
s Internal Current Regulator for 2-Wire Operation
s Output Slew Rate Controlled
s Resistant to Physical Stress
s Superior Temperature Stability
s Operation From Unregulated Supply
s Reverse Battery Protection
s Solid-State Reliability
s Small Size
Always order by complete part number: the prefix 'A' + the basic four-digit
part number + a suffix to indicate operating temperature range +
a suffix to indicate package style, e.g., A3260ELH .
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT BIPOLAR SWITCH
Suffix Code 'LH' Pinning
(SOT23W)
Supply Voltage, V
CC
........................... 27 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
Suffix `E' .................. -40
C to +85
C
Suffix `L' ................ -40
C to +150
C
Storage Temperature Range,
T
S
.............................. -65
C to +170
C
ABSOLUTE MAXIMUM RATINGS
at T
A
=+25
C
ADVANCE INFORMATION
(subject to change without notice)
December 6, 2002
NC
X
SUPPLY
GROUND
1
2
3
Dwg. PH-003-5
NO (INTERNAL)
CONNECTION
Pinning is shown viewed from branded side.
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT
BIPOLAR SWITCH
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
2
FUNCTIONAL BLOCK DIAGRAM
W
Copyright 2002 Allegro MicroSystems, Inc.
Dwg. FH-020-4
X
DYNAMIC
OFFSET CANCELLATION
SUPPLY
REG.
SAMPLE
& HOLD
LOW-PASS
FILTER
TO ALL
SUBCIRCUITS
GROUND
Pinning is shown viewed from branded side.
Suffix Code 'UA' Pinning
(ultra-mini SIP)
Suffix Code 'LT' Pinning
(SOT89/TO-243AA)
X
Dwg. PH-003-7A
1
SUPPLY
GROUND
3
2
GROUND
X
Dwg. PH-003-6
1
SUPPLY
GROUND
3
2
NO (INTERNAL)
CONNECTION
NC
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT
BIPOLAR SWITCH
www.allegromicro.com
3
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)
B > B
OP
-4.0
-6.5
-8.0
mA
I
GND(H)
B < B
RP
-11
-14.5
-18
mA
Chopping Frequency
f
C
340
kHz
Output Slew Rate
di/dt
C
L
= 20 pF
0.5
--
2.0
mA/
s
Output Settling Time
t
sd
C
L
= 20 pF
--
--
20
s
Reverse Battery Current
I
CC
V
RCC
= -16 V
-15
mA
Limits
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Operate Point
B
OP
10
30
G
Release Point
B
RP
-30
-10
G
Hysteresis
B
hys
B
OP
- B
RP
20
G
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).
NOTES: 1. B
OP
= operate point (output turns OFF); B
RP
= release point (output turns ON).
2. Typical Data is at T
A
= +25
C and V
CC
= 12 V and is for design information only.
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT
BIPOLAR SWITCH
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
4
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-008-8A
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
Package Designator "LT"
600
400
200
20
60
100
140
0
AMBIENT TEMPERATURE in
C
ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS
Dwg. GH-046-2D
Suffix "UA"
R
JA
= 165
C/W
40
80
120
180
700
500
300
100
160
Suffix "LT"
R
JA
= 180
C/W
800
Suffix "E"
Suffix "L"
Suffix "LH"
R
JA
= 228
C/W
Allegro
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT
BIPOLAR SWITCH
www.allegromicro.com
5
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
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
x per
Test to failure,
Human Body Model
Reading
test
All leads > TBD
Electrical Distributions
Per Specification
--
30
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT
BIPOLAR SWITCH
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
6
FUNCTIONAL DESCRIPTION
Chopper-Stabilized Technique. These devices use a
proprietary dynamic offset cancellation technique, with an
internal high-frequency clock to reduce the residual offset
voltage of the Hall element that is normally caused by device
overmolding, temperature dependencies, and thermal stress.
This technique produces devices that have an extremely stable
quiescent Hall output voltage, are immune to thermal stress, and
have precise recoverability after temperature cycling. This
technique will also slightly degrade the device output repeat-
ability.
The Hall element can be considered as a resistor array
similar to a Wheatstone bridge. A large portion of the offset is
a result of the mismatching of these resistors. The chopper-
stabilizing technique cancels the mismatching of the resistors by
changing the direction of the current flowing through the Hall
plate and Hall voltage measurement taps, while maintaining the
Hall-voltage signal that is induced by the external magnetic
flux. The signal is, then, captured by a sample-and-hold circuit.
Operation. The output of these devices turns ON when a
magnetic field (north pole) perpendicular to the Hall sensor
exceeds the release point threshold (B
RP
). After turn-ON, the
output will source current equal to the device operating current
plus a current source (I
GND(H)
). When the magnetic field is
increased (south pole) above the operate point (B
OP
), the output
will source current equal to the Hall-effect sensor operating
current with the current source turned OFF (I
GND(L)
). Note
especially that release can occur when the magnetic field is
removed but to ensure release, a field reversal is required. 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 me-
chanical vibration 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
.
Bipolar switches may switch on removal of field but
require field reversal for reliable operation over temperature
range; latches will not switch on removal of magnetic field.
Dwg. EH-012
REG
SAMPLE
& HOLD
X
+V
HALL
VOLTAGE
B
+
--
Dwg. AH-011-2
0
+B
0
OUTPUT CURRENT
FLUX DENSITY
Dwg. GH-034-6
-B
+I
I
OUT
+ I
CC
B
RP
B
OP
I
CC
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT
BIPOLAR SWITCH
www.allegromicro.com
7
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; and
Soldering of Surface-Mount Hall-Sensor Devices, Application Note 27703.2.
More detailed descriptions of the chopper-stabilized circuit operation can be found in:
Monolithic Magnetic Hall Sensor Using Dynamic Quadrature Offset Cancelation, Technical Paper STP 97-10; and
Chopper-Stabilized Amplifiers With A Track-and-Hold Signal Demodulator, Technical Paper STP 99-1.
All are provided in Allegro Electronic Data Book, AMS-702. or at
www.allegromicro.com
It is strongly recommended that an external bypass capaci-
tor be connected (in close proximity to the Hall sensor) between
the supply and ground of the device to reduce both external
noise and noise generated by the chopper-stabilization tech-
nique.
100
Dwg. EH-011-2A
0.1
F
SUPPLY
X
1
3
2
'UA' PACKAGE
0.95 V
+
APPLICATIONS INFORMATION
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT
BIPOLAR SWITCH
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
8
PACKAGE DESIGNATOR 'LH'
(fits SC-74A solder-pad layout)
Dwg. MA-010-3C mm
1
2
0.15
0.00
0.20
0.127
2.10
1.85
3.00
2.70
0.95
BSC
0.55
REF
0.50
0.30
3
1.13
0.87
0
TO
8
0.25
MIN
GAUGE PLANE
SEATING PLANE
0.25
BSC
3.10
2.90
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. Where no tolerance is specified, dimension is nominal.
5. Add "LT" to part number for tape and reel.
Dwg. MA-011-3 mm
1
2
1.00
2.40
0.95
0.70
3
Dwg. MA-010-3C in
1
2
0.006
0.000
0.0079
0.0050
0.083
0.073
0.118
0.106
0.037
BSC
0.022
REF
0.020
0.012
3
0.045
0.032
0
TO
8
0.020
MIN
GAUGE PLANE
SEATING PLANE
0.020
BSC
0.122
0.114
Dwg. MA-011-3 in
1
2
0.039
0.094
0.037
0.028
3
Dimensions in Inches
(for reference only)
Dimensions in Millimeters
(controlling dimensions)
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT
BIPOLAR SWITCH
www.allegromicro.com
9
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)
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
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
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT
BIPOLAR SWITCH
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
10
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 A3260xUA-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
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT
BIPOLAR SWITCH
www.allegromicro.com
11
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 responsi-
bility for its use; nor for any infringements of patents or other rights
of third parties that may result from its use.
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT
BIPOLAR SWITCH
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
12
HALL-EFFECT SENSORS
UNIPOLAR HALL-EFFECT DIGITAL SWITCHES
Partial
Operate
Release
Hysteresis
Replaces
Part
Point (G)
Point (G)
(G)
Oper.
and
Number
Over Oper. Voltage & Temp. Range
Temp.
Packages
Comments
A3121x
220 to 500
80 to 410
60 to 150
E, L
LT, UA
3019, 3113, 3119
A3122x
260 to 430
120 to 360
70 to 140
E, L
LT, UA
A3123x
230 to 470
160 to 330
70 to 140
E, L
LT, UA
A3141x
30 to 175
10 to 145
20 to 80
E, L
LT, UA
3040, 3140
A3142x
115 to 245
60 to 190
30 to 80
E, L
LT, UA
A3143x
205 to 355
150 to 300
30 to 80
E, L
LT, UA
A3144x
35 to 450
25 to 430
>20
E, L
LT, UA
3020, 3120
A3161E
<160 (Typ 130) >30 (Typ 110)
5 to 80
E
LT, UA
2-wire operation
A3163E
<160 (Typ 98)
>30 (Typ 79)
5 to 40
E
LT, UA
2-wire
A3240x
<50 (Typ 35)
>5 (Typ 25)
Typ 10
E, L
LH, LT, UA
chopper stabilized
A3250x
<50 to >350
_
5 to 35
J, L
UA
programmable, chopper stabilized
A3251x
<50 to >350
_
5 to 35
J, L
UA
programmable, chopper stabilized
A3361E
<125
>40
5 to 30
E
LH, LT, UA
2-wire, chopper stabilized,
output normally high
A3362E
<125
>40
5 to 30
E
LH, LT, UA
2-wire, chopper stabilized,
output normally low
MICROPOWER OMNIPOLAR HALL-EFFECT DIGITAL SWITCHES
Partial
Operate
Release
Hysteresis
Average
Part
Points (G)
Points (G)
(G)
Oper.
Supply
Number
Over Oper. Voltage & Temp. Range
Temp.
Packages
Current (
A)
A3209E
>-60, <60
<-5, >5
Typ 7.7
E
LH, UA
<425 (Typ 145)
A3210E
>-60, <60
<-5, >5
Typ 7.7
E
LH, UA
<60 (Typ 8.8)
A3212E
>-55, <55
<-10, >10
Typ. 8
E
LH, UA
<10 (Typ 4.2)
BIPOLAR HALL-EFFECT DIGITAL SWITCHES
Partial
Operate
Release
Hysteresis
Replaces
Part
Point (G)
Point (G)
(G)
Oper.
and
Number
Over Oper. Voltage & Temp. Range
Temp.
Packages
Comments
UGx3132
<95 (Typ 32)
>-95 (Typ -20) >30 (Typ 52)
K, L, S
LT, UA
3030, 3130, 3131
UGx3133
<75 (Typ 32)
>-75 (Typ -20) >30 (Typ 52)
K, L, S
LT, UA
UGx3134
-40 to 50
-50 to 40
5 to 55
E, L
LT, UA
A3260x
<30 (Typ 10)
>-30 (Typ -10)
Typ 20
E, L
LH, LT, UA
2 wire, chopper stabilized
Notes: 1) Typical data is at TA = +25
C and nominal operating voltage.
2) "x" = Operating Temperature Range [suffix letter or (prefix)]: S (UGN) = -20
C to +85
C, E = -40
C to +85
C,
J = -40
C to +115
C, K (UGS) = -40
C to +125
C, L (UGL) = -40
C to +150
C.
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