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3280, 3281, AND 3283
PRELIMINARY INFORMATION
(subject to change without notice) July 13, 1999 Suffix `-LT' & `-UA' Pinning
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 low-profile surface-mount package, `-LT' is a miniature SOT-89/TO243AA transistor package for surface-mount applications; while suffix `-UA' is a three-lead ultra-mini-SIP for through-hole mounting.
Data Sheet 27609.20
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 ....................... Internally Limited Reverse Output Current, IOUT ........ -50 mA Package Power Dissipation, PD . See Graph Junction Temperature, TJ ............... +170C Operating Temperature Range, TA Suffix `E-' .................. -40C to +85C Suffix `L-' ................ -40C to +150C Storage Temperature Range, TS .............................. -65C to +170C
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.
DYNAMIC OFFSET CANCELLATION
POWER-UP OUTPUT
SAMPLE & HOLD
X
LOW-PASS FILTER
CONTROL
CURRENT LIMIT <1 GROUND
Dwg. FH-020
Suffix `-LH' Pinning
700
ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS
3
600
500
Suffix "UA" RJA = 206C/W
X
PTCT
400 Suffix "LT" RJA = 258C/W 300
V
Suffix "LH" RJA = 439C/W
CC
200
1
2
GROUND
100
0 20 40 60 100 80 120 AMBIENT TEMPERATURE in C 140 160 180
Dwg. PH-003-4
Dwg. GH-046-2A
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 1999, Allegro MicroSystems, Inc.
OUTPUT
SUPPLY
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 + V D z z + zD VRCC = -30 V ICC = 15 mA, TA = 25C ICC = 15 mA, TA = 25C Test Conditions Operating, TJ < 170C1 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 50 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 supply voltage and temperature ranges.
Part Numbers1 A3280 Characteristic Operate Point, BOP Release Point, BRP Hysteresis, Bhys BOP - BRP Test Conditions Min. 5.0 -40 - Typ. Max. 22 -23 45 40 -5.0 - Min. 15 -90 - A3281 Typ. Max. 50 -50 100 90 -15 - Min. 100 -180 - A3283 Typ. Max. 150 -150 300 180 -100 - Units G G 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). 3. Typical Data is at TA = +25C and VCC = 12 V and is for design information only.
3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES
TYPICAL OPERATING CHARACTERISTICS as a function of temperature
A3280* SWITCH POINTS
50 40 30 20 10 0 -10 -20 -30 -40 -50 -50
RELEASE POINT V CC = 4.5 V V CC = 24 V OPERATE POINT
A3281* SWITCH POINTS
100 80 60
OPERATE POINT
40 20 0 -20 -40 -60 -80 -100 -50
V CC = 4.5 V V CC = 24 V
RELEASE POINT
-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 80 40 0 -40 -80 -120
RELEASE POINT V CC = 4.5 V V CC = 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).
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 V CC = 12 V
V CC = 12 V
5.0
200
4.0
OUTPUT ON, B > B
OP
100
3.0
OUTPUT OFF, B < B
RP
0 -50
2.0
-25
0
25
50
75
100
125
150
-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
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
Dwg. GH-021-3
24
-80 3.0
3.5
4.0
4.5
5.0
Dwg. GH-021-1
24
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).
3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES
SENSOR LOCATIONS
(0.005" [0.13 mm] die placement)
TYPICAL OPERATING CHARACTERISTICS as a function of supply voltage (cont'd)
OUTPUT SATURATION VOLTAGE
250
IOUT = 20 mA
Package Designator `LH'
ACTIVE AREA DEPTH 0.011" 0.28 mm NOM 0.059" 1.49 mm 3 0.038" 0.96 mm
TA = 150C TA = +25C TA = -40C
225
A
1 2
200
Package Designator `LT'
Dwg. MH-025
ACTIVE AREA DEPTH 0.030" 0.76 mm NOM
175
0.088" 2.24 mm 0.045" 1.14 mm
150 3.0
3.5
4.0
4.5
5.0
Dwg. GH-055-1
24
A
1 2 3
SUPPLY VOLTAGE IN VOLTS
SUPPLY CURRENT
Dwg. MH-008-8
8.0
OUTPUT ON
Package Designators `UA' and `UA-TL'
ACTIVE AREA DEPTH 0.018" 0.46 mm NOM 0.080" 2.04 mm
7.0
TA = 150C TA = +25C TA = -40C
6.0
5.0
0.056" 1.44 mm
4.0
A
BRANDED SURFACE 1 2 3
3.0 2.0 1.0
Dwg. MH-011-9A
0
3.0
3.5
4.0
4.5
5.0
Dwg. GH-058-4
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
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
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 Biased Humidity (HAST) High-Temperature Operating Life (HTOL) Accelerated HTOL Test Method and Test Conditions TA = 130C, RH = 85% JESD22-A108, TA = 150C, TJ = 170C JESD22-A108, TA = 175C, TJ = 190C JESD22-A102, Condition C, TA = 121C, 15 psig MIL-STD-883, Method 1008, TA = 170C MIL-STD-883, Method 1010, -65C to +150C -- Test Length 50 hrs 408 hrs Samples 77 77 Comments VCC = VOUT = 5 V VCC = 24 V, VOUT = 20 V VCC = 24 V, VOUT = 20 V
504 hrs
77
Autoclave, Unbiased
96 hrs
77
High-Temperature (Bake) Storage Life Temperature Cycle
1000 hrs
77
500 cycles
77
Latch-Up
Pre/Post Reading Pre/Post Reading Pre/Post Reading --
6
Electro-Thermally Induced Gate Leakage ESD, Human Body Model Electrical Distributions
--
6
CDF-AEC-Q100-002
x per test 30
Test to failure, All leads > TBD
Per Specification
3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES
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 repeatability. 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 chopperstabilizing 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-andhold circuit. 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. 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 chopperstabilization technique. 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
+V
Dwg. EH-012
REG
X
B
--
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
SUPPLY
3
PTCT
2
CC
www.allegromicro.com
X
0.1 F
1 V
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
SAMPLE & HOLD
OUTPUT
SUPPLY
Dwg. EH-013
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)
0.122 0.114 0.018 0.012 0.083 0.073 0.022
REF 3 1 2
3.10 2.90
0.0079 0.0059 0.118 0.106 0 TO 8 0.037
BSC
0.45 0.30 2.10 1.85 0.55
REF 3 1 2
0.20 0.15 3.00 2.70 0 TO 8 0.95
BSC
0.020 MIN
0.25 MIN
0.006 0.000
0.043 0.035 0.049 0.035
Dwg. MA-010-3A in
0.15 0.00
1.10 0.90 1.25 0.90
Dwg. MA-010-3A 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.
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)
0.173 0.181 0.064 0.072 0.090 0.102
0.055 0.063 0.014 0.017
4.40 4.60 1.62 1.83 2.29 2.60
1.40 1.60 0.35 0.44
0.155 0.167
1
2
3
0.084 0.090
3.94 4.25
1
2
3
2.13 2.29
0.035 0.047 0.059
BSC
0.014 0.019 0.017 0.022 0.118
BSC
Dwg. MA-009-3 in
0.89 1.20 1.50
BSC
0.36 0.48 0.44 0.56 3.00
BSC
Dwg. MA-009-3 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 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
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 mm
NOTE: Exact body and lead configuration at vendor's option within limits shown.
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
0.015
16.26 15.24
0.38
SEE NOTE
0.016
SEE NOTE
0.41
0.050
BSC
Dwg. MH-014D in
1.27
BSC
Dwg. MH-014D mm
Surface-Mount Lead Form (Suffix `-TL')
0.095
0.005
2.41
0.13
0.002
MAX
0.051
MAX
0.004 0-8
MAX
0.020
MIN FLAT
Dwg. MH-015 in
0.10
MAX
0-8 0.51
MIN FLAT
Dwg. MH-015 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. Recommended minimum PWB hole diameter to clear transition area is 0.035" (0.89 mm). 5. Where no tolerance is specified, dimension is nominal.
3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES
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 design of its products. 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 which may result from its use.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

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