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3280, 3281, AND 3283
Suffix '-LT' & '-UA' Pinning
(SOT89/TO-243AA & ultra-mini SIP)
CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES
The A3280--, A3281--, and A3283-- Hall-effect latches are extremely temperature-stable and stress-resistant sensors especially suited for operation over extended temperature ranges to +150C. 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. 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. The first character of the part number suffix determines the device operating temperature range; suffix `E-' is for -40C to +85C and `L-' is -40C to +150C. Three package styles provide a magnetically optimized 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 27609.20b
X
PTCT
V
CC
1
2
3
GROUND
Dwg. PH-003-2
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at TA = +25C 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 .......................................... 25 mA* Reverse Output Current, IOUT ........ -50 mA Package Power Dissipation, PD . See Graph Junction Temperature, TJ ............... +165C Operating Temperature Range, TA Suffix `E-' .................. -40C to +85C Suffix `L-' ................ -40C to +150C Storage Temperature Range, TS .............................. -65C to +170C
*Internal current limiting is intended to protect the device from output short circuits.
OUTPUT
SUPPLY
FEATURES
s s s s s s s s Symmetrical Switch Points Resistant to Physical Stress Superior Temperature Stability Output Short-Circuit Protection Operation From Unregulated Supply Reverse Battery Protection Solid-State Reliability Small Size
Always order by complete part number: the prefix `A' + the basic fourdigit part number + a suffix to indicate operating temperature range + a suffix to indicate package style, e.g., A3281ELH .
3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES
FUNCTIONAL BLOCK DIAGRAM
SUPPLY
REG.
TO ALL SUBCIRCUITS
DYNAMIC OFFSET CANCELLATION
OUTPUT
SAMPLE & HOLD
X
LOW-PASS FILTER
CONTROL
CURRENT LIMIT <1 GROUND
Dwg. FH-020-1
800
ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS
Suffix `-LH' Pinning (SOT23W)
3
Suffix "-UA" RJA = 165C/W
700
600
X
500 Suffix "-LH" RJA = 228C/W 400
Suffix "-LT" RJA = 180C/W
PTCT
V
300
CC
1
200
2
100 Suffix "L-" 0 20 40 60 100 80 120 AMBIENT TEMPERATURE in C 140 160 180
Dwg. GH-046-2D
Dwg. PH-003-4
2
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2000, 2003, 2004 Allegro MicroSystems, Inc.
OUTPUT
SUPPLY
Suffix "E-"
GROUND
3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES
ELECTRICAL CHARACTERISTICS over operating temperature range.
Limits Characteristic Supply Voltage Range Output Leakage Current Output Saturation Voltage Output Current Limit Power-On Time Chopping Frequency Output Rise Time Output Fall Time Supply Current Symbol VCC IOFF VOUT(SAT) IOM tpo fC tr tf ICC RL = 820 , CL = 20 pF RL = 820 , CL = 20 pF B < BRP, VCC = 12 V B > BOP, VCC = 12 V Reverse Battery Current Zener Voltage Zener Impedance ICC VZ + VD zz + z D VRCC = -30 V ICC = 15 mA, TA = 25C ICC = 15 mA, TA = 25C Test Conditions Operating, TJ < 165C1 VOUT = 24 V, B < BRP IOUT = 20 mA, B > BOP B > BOP VCC > 4.2 V Min. 4.2 - - 30 - - - - - - - 28 - Typ. - - 185 - - 340 0.2 0.1 3.0 4.0 - 32 50 Max. 24 10 500 60 50 - 2.0 2.0 8.0 8.0 -5.0 37 - Units V A mV mA s kHz s s mA mA mA V
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 = +25C and VCC = 12 V and is for design information only.
MAGNETIC CHARACTERISTICS over operating voltage range.
Part Numbers1 A3280 Characteristic Operate Point, BOP Test Conditions at TA = +25C and TA = max. at TA = -40C Release Point, BRP at TA = +25C and TA = max. at TA = -40C Hysteresis, Bhys at TA = +25C and TA = max. at TA = -40C Min. 5.0 5.0 -40 -40 10 - Typ. Max. 22 - -23 - 45 - 40 40 -5.0 -5.0 80 80 Min. 15 15 -90 -90 30 - A3281 Typ. Max. 50 - -50 - 100 - 90 90 -15 -15 180 180 Min. 100 100 -180 -200 - - A3283 Typ. Max. 150 - -150 - 300 - 180 200 -100 -100 360 360 Units G G G G G G
(BOP - BRP)
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 = +25C and VCC = 12 V and is for design information only. 4. 1 gauss (G) is exactly equal to 0.1 millitesla (mT).
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3
3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES
TYPICAL OPERATING CHARACTERISTICS as a function of temperature
A3280* SWITCH POINTS
50 40 30
SWITCH POINTS IN GAUSS
OPERATE POINT
A3281* SWITCH POINTS
100 80 60
OPERATE POINT
20 10 0 -10 -20 -30 -40 -50 -50
RELEASE POINT VCC = 4.5 V VCC = 24 V
SWITCH POINTS IN GAUSS
40 20 0 -20 -40 -60 -80 -100 -50
RELEASE POINT VCC = 4.5 V to 24 V
-25
0
25
50
75
100
125
150
-25
0
25
50
75
100
125
150
AMBIENT TEMPERATURE IN C
Dwg. GH-026-3
AMBIENT TEMPERATURE IN C
Dwg. GH-026-4
A3283* SWITCH POINTS
200 160
OPERATE POINT
120
SWITCH POINTS IN GAUSS
80 40 0 -40 -80 -120
RELEASE POINT VCC = 4.5 V VCC = 24 V
-160 -200 -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).
4
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES
TYPICAL OPERATING CHARACTERISTICS as a function of temperature (cont'd)
OUTPUT SATURATION VOLTAGE
300
6.0
SUPPLY CURRENT
IOUT = 20 mA VCC = 12 V
VCC = 12 V
SATURATION VOLTAGE IN mV
5.0
200
SUPPLY CURRENT IN mA
4.0
OUTPUT ON, B > BOP
100
3.0
OUTPUT OFF, B < BRP
0 -50
-25
0
25
50
75
100
125
150
2.0 -50
-25
0
25
50
75
100
125
150
AMBIENT TEMPERATURE IN C
Dwg. GH-029-4
AMBIENT TEMPERATURE IN C
Dwg. GH-028-5
TYPICAL OPERATING CHARACTERISTICS as a function of supply voltage
A3280* SWITCH POINTS
40
80
A3281* SWITCH POINTS
OPERATE POINT
OPERATE POINT
20
40
SWITCH POINT IN GAUSS
SWITCH POINT IN GAUSS
0
TA = 150C TA = -40C
0
TA = 150C TA = -40C
-20
RELEASE POINT
-40
RELEASE POINT
-40 3.0
3.5
4.0
4.5
5.0
24
Dwg. GH-021-3
-80 3.0
3.5
4.0
4.5
5.0
24
Dwg. GH-021-1
SUPPLY VOLTAGE IN VOLTS
SUPPLY VOLTAGE IN VOLTS
* Complete part number includes a suffix denoting operating temperature range (E or L) and package type (LH, LT, or UA).
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5
3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES
SENSOR LOCATIONS TYPICAL OPERATING CHARACTERISTICS as a function of supply voltage (cont'd)
OUTPUT SATURATION VOLTAGE
250
0.059" 1.49 mm 3 0.038" 0.96 mm
IOUT = 20 mA TA = 150C TA = +25C TA = -40C
Package Designator `LH'
ACTIVE AREA DEPTH 0.011" 0.28 mm NOM
A
1 2
Dwg. MH-025
SATURATION VOLTAGE IN mV
225
200
Package Designator `LT'
ACTIVE AREA DEPTH 0.0305" 0.775 mm NOM 0.088" 2.24 mm 0.045" 1.14 mm
175
150 3.0
3.5
4.0
4.5
5.0
24
Dwg. GH-055-1
A
1 2 3
SUPPLY VOLTAGE IN VOLTS
SUPPLY CURRENT
Dwg. MH-008-8A
8.0 7.0 6.0
SUPPLY CURRENT IN mA
OUTPUT ON TA = 150C TA = +25C TA = -40C
Package Designator `UA'
ACTIVE AREA DEPTH 0.0195" 0.50 mm NOM 0.080" 2.04 mm
5.0 4.0 3.0 2.0 1.0
0.056" 1.44 mm
A
BRANDED SURFACE 1 2 3
Dwg. MH-011-9B
0 3.0
4.0
5.0
6.0
7.0
8.0
9.0
10
11
12
Although sensor location is accurate to three sigma for a particular design, product improvements may result in small changes to sensor location.
SUPPLY VOLTAGE IN VOLTS
Dwg. GH-058-4
Allegro
6
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES
FUNCTIONAL DESCRIPTION
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 dependencies, 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-andhold 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. 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. 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 VOUT(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. Powering up in the absence of a magnetic field (less than BOP and higher than BRP) will allow an indeterminate output state. The correct state is warranted after the first excursion beyond BOP or BRP.
REG
SAMPLE & HOLD
X
Dwg. EH-012
B +V
--
HALL VOLTAGE
+
Dwg. AH-011-2
+V
VCC
OUTPUT VOLTAGE
B RP
B OP
VOUT(SAT)
0 -B 0 FLUX DENSITY +B
Dwg. GH-034-5
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3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES
APPLICATIONS INFORMATION
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
3
OUTPUT
PTCT
2
0.1 F
CC
V
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 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 at
8
X
1
SUPPLY
Dwg. EH-013
www.allegromicro.com
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 responsibility 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
3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES
PACKAGE DESIGNATOR `LH'
(SOT23W, fits SC-59A solder-pad layout) Dimensions in Inches (for reference only) Dimensions in Millimeters (controlling dimensions)
0.122 0.114 0.020 0.012 0.083 0.073
3 1 2
3.10 2.90 0.50 0.30
0.118 0.106
GAUGE PLANE SEATING PLANE
0.010
BSC
2.10 1.85
3 1 2
3.00 2.70
GAUGE PLANE SEATING PLANE
0.25
BSC
0.022
REF
0.55
0.037
BSC
0 TO 8 0.0079 0.0050
0.010
MIN
REF
0.95
BSC
0 TO 8 0.20 0.127
0.25
MIN
0.006 0.000
0.045 0.032
0.15 0.00
Dwg. MA-010-3D in
1.13 0.87
Dwg. MA-010-3D mm
0.028
3
0.70
3
0.039 0.094
1 2
1.00 2.40
1 2
0.037
Dwg. MA-011-3 in
0.95
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.
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9
3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES
PACKAGE DESIGNATOR `LT'
(SOT89/TO-243AA) Dimensions in Inches (for reference only) Dimensions in Millimeters (controlling dimensions)
0.181 0.173 0.072 0.064 0.167 0.155 0.102 0.090
0.063 0.055
0.0173 0.0138
4.60 4.40 1.83 1.62 4.25 3.94 2.60 2.29
1.60 1.40
0.44 0.35
1
2
3
0.090 0.084
1
2
3
2.29 2.13
0.047 0.035 0.059
BSC
0.0189 0.0142 0.0221 0.0173 0.118
BSC
Dwg. MA-009-3A in
1.20 0.89 1.50
BSC
0.48 0.36 0.56 0.44 3.00
BSC
Dwg. MA-009-3A mm
0.098 0.079 B A 0.031 0.102 0.181 3 0.047 0.031
TYP
2.5 2.0 B A 0.8 2.6 4.6 1.2 0.8
TYP
1 0.028
TYP
2
1 0.7
TYP
2
3
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
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
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. 3. Only low-temperature (240C) reflow-soldering techniques are recommended for SOT89 devices.
10
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES
PACKAGE DESIGNATOR `UA'
Dimensions in Inches (controlling dimensions)
0.164 0.159
Dimensions in Millimeters (for reference only)
4.17 4.04
45
0.062 0.058
45
1.57 1.47
0.122 0.117 45 0.031
3.10 2.97 45 0.79
0.085
MAX
1
2
3
2.16
MAX
1
2
3
0.640 0.600
0.0173 0.0138
16.26 15.24
0.44 0.35
SEE NOTE
0.0189 0.0142
SEE NOTE
0.48 0.36
0.050
BSC
Dwg. MH-014E in
1.27
BSC
Dwg. MH-014E mm
Radial Lead Form (order A328xxUA-LC)
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).
1
2
3
0.620" 0.500" (15.7 mm 12.7 mm)
0.108" (2.74 mm)
0.100" (2.5 mm)
Dwg. MH-026
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).
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