A3281LH [ALLEGRO]
CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES; 斩波稳定，精密霍尔效应锁存
| 型号： | A3281LH |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES |
| 文件： | 总12页 (文件大小：197K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
3280, 3281,
AND 3283
CHOPPER-STABILIZED, PRECISION
HALL-EFFECT LATCHES
The A3280--, A3281--, and A3283-- Hall-effect latches are ex-
tremely temperature-stable and stress-resistant sensors 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 three devices are identical except for magnetic switch points.
Suffix '–LT' & '–UA' Pinning
PTCT
Each device includes on a single silicon chip a voltage regulator,
Hall-voltage generator, small-signal amplifier, chopper stabilization,
Schmitt trigger, and a short-circuit protected open-collector output to
sink up to 25 mA. A south pole of sufficient strength will turn the
output on. A north pole is necessary to turn the output off. An on-board
regulator permits operation with supply voltages of 4.2 to 24 volts.
V
CC
1
2
3
The first character of the part number suffix determines the device
operating temperature range; suffix ‘E–’ is for -40°C to +85°C and
‘L–’ is -40°C to +150°C. Three package styles provide a magnetically
optimized package for most applications. Suffix ‘–LH’ is a miniature
low-profile surface-mount package, ‘–LT’ is a miniature SOT-89/TO-
243AA transistor package for surface-mount applications; while suffix
‘–UA’ is a three-lead ultra-mini-SIP for through-hole mounting.
Dwg. PH-003-2
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at T = +25°C
A
FEATURES
Supply Voltage, VCC ........................ 26.5 V
Reverse Battery Voltage, VRCC .......... -30 V
Magnetic Flux Density, B ........... Unlimited
Output Off Voltage, VOUT ................... 26 V
Continuous Output Current,
IOUT ....................... Internally Limited
Reverse Output Current, IOUT ........ -50 mA
Package Power Dissipation, PD . See Graph
Junction Temperature, TJ ............... +170°C
Operating Temperature Range, TA
I Symmetrical Switch Points
I Resistant to Physical Stress
I Superior Temperature Stability
I Output Short-Circuit Protection
I Operation From Unregulated Supply
I Reverse Battery Protection
I Solid-State Reliability
I Small Size
Suffix ‘E–’.................. -40°C to +85°C
Suffix ‘L–’................ -40°C to +150°C
Storage Temperature Range,
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., A3281ELH .
TS .............................. -65°C to +170°C
3280, 3281, AND 3283
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT LATCHES
FUNCTIONAL BLOCK DIAGRAM
SUPPLY
TO ALL
SUBCIRCUITS
REG.
OUTPUT
X
CONTROL
CURRENT
LIMIT
<1Ω
GROUND
Dwg. FH-020-1
Suffix ‘–LH’ Pinning
700
600
500
400
300
3
Suffix "–UA"
θJA = 206°C/W
R
PTCT
Suffix "–LT"
Suffix "–LH"
RθJA = 248°C/W
RθJA = 258°C/W
V
CC
1
2
200
100
0
Suffix "E–"
Suffix "L–"
140
20
40
60
80
100
120
160
180
Dwg. PH-003-4
AMBIENT TEMPERATURE in °C
Dwg. GH-046-2C
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2000 Allegro MicroSystems, Inc.
2
3280, 3281, AND 3283
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT LATCHES
ELECTRICAL CHARACTERISTICS over operating temperature range.
Limits
Typ.
Characteristic
Symbol
Test Conditions
Operating, TJ < 170°C1
VOUT = 24 V, B < BRP
IOUT = 20 mA, B > BOP
B > BOP
Min.
4.2
–
Max.
24
Units
V
Supply Voltage Range
Output Leakage Current
Output Saturation Voltage
Output Current Limit
Power-On Time
VCC
–
–
IOFF
10
µA
mV
mA
µs
VOUT(SAT)
–
185
–
500
60
IOM
tpo
fC
30
–
VCC > 4.2 V
–
50
Chopping Frequency
Output Rise Time
–
340
0.2
0.1
3.0
4.0
–
–
kHz
µs
tr
RL = 820 Ω, CL = 20 pF
RL = 820 Ω, CL = 20 pF
B < BRP, VCC = 12 V
B > BOP, VCC = 12 V
VRCC = -30 V
–
2.0
2.0
8.0
8.0
-5.0
37
Output Fall Time
tf
–
µs
Supply Current
ICC
–
mA
mA
mA
V
–
Reverse Battery Current
Zener Voltage
ICC
–
VZ + VD
zz + zD
ICC = 15 mA, TA = 25°C
ICC = 15 mA, TA = 25°C
28
–
32
50
Zener Impedance
–
Ω
NOTES:1. Maximum voltage must be adjusted for power dissipation and junction temperature.
2. BOP = operate point (output turns on); BRP = release point (output turns off).
3. Typical Data is at TA = +25°C and VCC = 12 V and is for design information only.
MAGNETIC CHARACTERISTICS over operating supply voltage range.
Part Numbers1
A3281
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.
A3280
A3283
Characteristic
Test Conditions
Units
G
Operate Point, BOP
at TA = +25°C and TA = max.
at TA = -40°C
5.0
5.0
-40
-40
10
22
–
40
40
15
15
-90
-90
30
–
50
–
90
90
100 150 180
100 200
-180 -150 -100
–
G
Release Point, BRP
at TA = +25°C and TA = max.
at TA = -40°C
-23
–
-5.0
-5.0
80
-50
–
-15
-15
G
-200
–
-100
300 360
400
G
Hysteresis, Bhys
at TA = +25°C and TA = max.
at TA = -40°C
45
–
100 180
180
–
–
G
(BOP - BRP)
–
80
–
–
G
NOTES:1. Complete part number includes a suffix to identify operating temperature range (E or L) and
package type (LH, LT, or UA).
2. As used here, negative flux densities are defined as less than zero (algebraic convention) and -50 G is less than +10 G.
3. Typical Data is at TA = +25°C and VCC = 12 V and is for design information only.
www.allegromicro.com
3
3280, 3281, AND 3283
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT LATCHES
TYPICAL OPERATING CHARACTERISTICS
as a function of temperature
A3281* SWITCH POINTS
A3280* SWITCH POINTS
100
80
50
40
30
60
OPERATE POINT
OPERATE POINT
20
10
40
20
V
V
CC = 4.5 V
CC = 24 V
0
0
-20
VCC = 4.5 V to 24 V
-10
-20
-30
-40
-50
RELEASE POINT
-40
RELEASE POINT
-60
-80
-100
-50
-25
0
25
50
75
100
125
150
-50
-25
0
25
50
75
100
125
150
AMBIENT TEMPERATURE IN °C
AMBIENT TEMPERATURE IN °C
Dwg. GH-026-3
Dwg. GH-026-4
A3283* SWITCH POINTS
200
160
120
OPERATE POINT
80
40
VCC = 4.5 V
VCC = 24 V
0
-40
-80
-120
-160
-200
RELEASE POINT
-50
-25
0
25
50
75
100
125
150
AMBIENT TEMPERATURE IN °C
Dwg. GH-026-6
* Complete part number includes a suffix denoting operating temperature range (E or L) and package type (LH, LT, or UA).
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
4
3280, 3281, AND 3283
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT LATCHES
TYPICAL OPERATING CHARACTERISTICS
as a function of temperature (cont'd)
OUTPUT SATURATION VOLTAGE
SUPPLY CURRENT
6.0
300
200
I
OUT = 20 mA
V
CC = 12 V
VCC = 12 V
5.0
4.0
3.0
2.0
OUTPUT ON, B > BOP
100
OUTPUT OFF, B < BRP
0
-50
-50
-25
0
25
50
75
100
125
150
-25
0
25
50
75
100
125
150
AMBIENT TEMPERATURE IN °C
AMBIENT TEMPERATURE IN °C
Dwg. GH-028-5
Dwg. GH-029-4
TYPICAL OPERATING CHARACTERISTICS
as a function of supply voltage
A3281* SWITCH POINTS
A3280* SWITCH POINTS
80
40
20
OPERATE POINT
OPERATE POINT
40
T
T
A
A
= 150°C
= -40°C
T
T
A
A
= 150°C
= -40°C
0
-40
-80
0
-20
-40
RELEASE POINT
RELEASE POINT
24
3.0
3.5
4.0
4.5
5.0
24
3.0
3.5
4.0
4.5
5.0
SUPPLY VOLTAGE IN VOLTS
SUPPLY VOLTAGE IN VOLTS
Dwg. GH-021-1
Dwg. GH-021-3
* Complete part number includes a suffix denoting operating temperature range (E or L) and package type (LH, LT, or UA).
www.allegromicro.com
5
3280, 3281, AND 3283
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT LATCHES
TYPICAL OPERATING CHARACTERISTICS
as a function of supply voltage (cont’d)
SENSOR LOCATIONS
( 0.005" [0.13 mm] die placement)
OUTPUT SATURATION VOLTAGE
Package Designator ‘LH’
250
ACTIVE AREA DEPTH
I
OUT = 20 mA
0.011"
0.059"
T
T
T
A
A
A
= 150°C
= +25°C
= -40°C
0.28 mm
1.49 mm
NOM
3
0.038"
0.96 mm
225
200
A
1
2
Dwg. MH-025
Package Designator ‘LT’
175
150
ACTIVE AREA DEPTH
0.030"
0.76 mm
NOM
0.088"
2.24 mm
0.045"
1.14 mm
24
3.0
3.5
4.0
4.5
5.0
SUPPLY VOLTAGE IN VOLTS
Dwg. GH-055-1
A
1
2
3
SUPPLY CURRENT
Dwg. MH-008-8
8.0
7.0
OUTPUT ON
T
T
T
A
A
A
= 150°C
= +25°C
= -40°C
Package Designators ‘UA’ and ‘UA-TL’
ACTIVE AREA DEPTH
6.0
5.0
4.0
3.0
2.0
1.0
0
0.018"
0.080"
0.46 mm
2.04 mm
NOM
0.056"
1.44 mm
A
BRANDED
SURFACE
1
2
3
Dwg. MH-011-9A
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10
11
12
SUPPLY VOLTAGE IN VOLTS
Although sensor location is accurate to three sigma for a
particular design, product improvements may result in small
changes to sensor location.
Dwg. GH-058-4
Allegro
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
6
3280, 3281, AND 3283
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT LATCHES
CRITERIA FOR DEVICE QUALIFICATION
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.
Qualification Test
Test Method and Test Conditions
Test Length
50 hrs
Samples
Comments
Biased Humidity (HAST) TA = 130°C, RH = 85%
77
77
VCC = VOUT = 5 V
High-Temperature
Operating Life (HTOL)
JESD22-A108,
TA = 150°C, TJ ≤ 170°C
408 hrs
VCC = 24 V,
VOUT = 20 V
Accelerated HTOL
TA = 175°C, TJ ≤ 190°C
504 hrs
96 hrs
77
77
77
77
6
VCC = 24 V,
VOUT = 20 V
Autoclave, Unbiased
JESD22-A102, Condition C,
TA = 121°C, 15 psig
High-Temperature
(Bake) Storage Life
MIL-STD-883, Method 1008,
TA = 170°C
1000 hrs
500 cycles
Temperature Cycle
MIL-STD-883, Method 1010,
-65°C to +150°C
Latch-Up
—
Pre/Post
Reading
Electro-Thermally
Induced Gate Leakage
—
Pre/Post
Reading
6
ESD,
Human Body Model
CDF-AEC-Q100-002
JESD22-A115
Per Specification
Pre/Post
Reading
3 per
test
Test to failure,
All leads > 1500 V
ESD,
Macine Model
Pre/Post
Reading
3 per
test
Test to failure,
All leads > 200 V
Electrical Distributions
—
30
www.allegromicro.com
7
3280, 3281, AND 3283
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT LATCHES
FUNCTIONAL DESCRIPTION
REG
Chopper-Stabilized Technique. 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. 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 dependen-
cies, and thermal stress. The chopper-stabilizing technique
cancels the mismatching of the resistor circuit by changing the
direction of the current flowing through the Hall plate using
CMOS switches and Hall voltage measurement taps, while
maintaing the Hall-voltage signal that is induced by the external
magnetic flux. The signal is then captured by a sample-and-
hold circuit and further processed using low-offset bipolar
circuitry. 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 repeatability. A relatively high sampling frequency is
used in order that faster signals can be processed.
X
B
+V
Dwg. EH-012
—
HALL
VOLTAGE
+
Dwg. AH-011-2
More detailed descriptions of the circuit operation can be
found in: Technical Paper STP 97-10, Monolithic Magnetic
Hall Sensor Using Dynamic Quadrature Offset Cancellation
and Technical Paper STP 99-1, Chopper-Stabilized Amplifiers
With A Track-and-Hold Signal Demodulator.
+V
V
CC
Operation. The output of these devices switches low (turns
on) when a magnetic field perpendicular to the Hall sensor
exceeds the operate point threshold (BOP). After turn-on, the
output is capable of sinking 25 mA and the output voltage is
V
OUT(SAT). Note that the device latches; that is, a south pole of
sufficient strength towards the branded surface of the device
will turn the device on; removal of the south pole will leave the
device on. When the magnetic field is reduced below the
release point (BRP), the device output goes high (turns off). The
difference in the magnetic operate and release points is the
hysteresis (Bhys) of the device. This built-in hysteresis allows
clean switching of the output even in the presence of external
mechanical vibration and electrical noise.
B
B
OP
RP
V
OUT(SAT)
0
-B
0
+B
FLUX DENSITY
Dwg. GH-034-5
Applications. 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 to reduce
both external noise and noise generated by the chopper-
stabilization technique.
SUPPLY
OUTPUT
The simplest form of magnet that will operate these devices
is a ring magnet. Other methods of operation, such as linear
magnets, are possible. Extensive applications information on
magnets and Hall-effect sensors is also available in the Allegro
Electronic Data Book AMS-702 or Application Note 27701, or
0.1 µF
X
SUPPLY
www.allegromicro.com
Dwg. EH-013
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
8
3280, 3281, AND 3283
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT LATCHES
PACKAGE DESIGNATOR ‘LH’
(fits SC-74A solder-pad layout)
Dimensions in Inches
(for reference only)
Dimensions in Millimeters
(controlling dimensions)
3.10
2.90
0.122
0.114
0.020
0.012
0.0079
0.0050
0.50
0.30
0.20
0.127
3
3
0.118
0.106
3.00
2.70
0.083
0.073
2.10
1.85
0.25 MIN
0.020 MIN
1
2
1
2
0.55
0.022
0° TO 8°
0° TO 8°
REF
REF
0.95
BSC
0.037
BSC
1.10
0.90
0.043
0.035
0.049
0.15
0.00
0.006
0.000
1.25
0.90
0.035
Dwg. MA-010-3B mm
Dwg. MA-010-3B in
0.70
0.028
3
3
0.039
1.00
0.094
2.40
1
2
1
2
0.037
0.95
Dwg. MA-011-3 in
Dwg. MA-011-3 mm
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.
www.allegromicro.com
9
3280, 3281, AND 3283
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT LATCHES
PACKAGE DESIGNATOR ‘LT’
(SOT-89/TO-243AA)
Dimensions in Inches
(for reference only)
Dimensions in Millimeters
(controlling dimensions)
0.181
0.173
0.072
0.064
0.063
0.055
4.60
4.40
1.83
1.62
1.60
1.40
0.0173
0.0138
0.44
0.35
0.102
0.090
0.090
0.084
2.60
2.29
2.29
2.13
0.167
0.155
4.25
3.94
2
3
1
2
3
1
0.0189
0.0142
0.0221
0.0173
0.48
0.36
0.047
1.20
0.035
0.89
0.56
0.44
0.059
1.50
BSC
BSC
0.118
3.00
BSC
BSC
Dwg. MA-009-3A in
Dwg. MA-009-3A mm
2.5
2.0
0.098
0.079
B
B
0.8
0.031
0.102
0.181
2.6
1.2
A
2
A
2
4.6
0.047
3
1
1
3
0.028
0.031
0.7
0.8
TYP
TYP
TYP
TYP
Pads 1, 2, 3, and A — Standard SOT-89 Layout
Pads 1, 2, 3, and B — Low-Stress Version
Pads 1, 2, and 3 only — Lowest Stress, But Not Self Aligning
Pads 1, 2, 3, and A — Standard SOT-89 Layout
Pads 1, 2, 3, and B — Low-Stress Version
Pads 1, 2, and 3 only — Lowest Stress, But Not Self Aligning
Dwg. MA-012-3 in
Dwg. MA-012-3 mm
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.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
10
3280, 3281, AND 3283
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT LATCHES
PACKAGE DESIGNATOR ‘UA’
Dimensions in Millimeters
Dimensions in Inches
(controlling dimensions)
(for reference only)
0.164
0.159
4.17
4.04
0.062
0.058
1.57
1.47
45°
45°
0.122
0.117
3.10
2.97
45°
45°
0.79
0.031
2.16
MAX
0.085
MAX
1
2
3
1
2
3
16.26
15.24
0.44
0.35
0.640
0.600
0.0173
0.0138
0.48
0.36
SEE NOTE
0.0189
0.0142
SEE NOTE
1.27
BSC
0.050
BSC
Dwg. MH-014E mm
Dwg. MH-014E in
Surface-Mount Lead Form (order A328xxUA-TL)
0.095
2.41
0.13
0.005
0.002
MAX
0.051
MAX
0°–8°
0°–8°
0.004
MAX
0.10
0.020
MIN
FLAT
0.51
MAX
MIN
Dwg. MH-015 in
Dwg. MH-015 mm
FLAT
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).
www.allegromicro.com
11
3280, 3281, AND 3283
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT LATCHES
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.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
12
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