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3260
Suffix Code 'LH' Pinning
(SOT23W)
3
2-WIRE, CHOPPER-STABILIZED, PRECISION HALL-EFFECT BIPOLAR SWITCH
The A3260-- Hall-effect bipolar switch is an extremely temperature-stable and stress-resistant sensor 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 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 -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 27631.50
NC
1 2
X
GROUND
NO (INTERNAL) CONNECTION
Dwg. PH-003-5
Pinning is shown viewed from branded side.
SUPPLY
FEATURES
ABSOLUTE MAXIMUM RATINGS
at TA=+25C Supply Voltage, VCC ........................... 27 V Reverse Battery Voltage, VRCC .......... -16 V Magnetic Flux Density, B ........... Unlimited 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
s s s s s s s s
Internal Current Regulator for 2-Wire Operation Output Slew Rate Controlled Resistant to Physical Stress Superior Temperature Stability Operation From Unregulated Supply Reverse Battery Protection Solid-State Reliability 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
FUNCTIONAL BLOCK DIAGRAM
SUPPLY
REG.
TO ALL SUBCIRCUITS
DYNAMIC OFFSET CANCELLATION
SAMPLE & HOLD
X
LOW-PASS FILTER
GROUND
Dwg. FH-020-4
Suffix Code 'UA' Pinning
(ultra-mini SIP)
Suffix Code 'LT' Pinning
(SOT89/TO-243AA)
X
NC
X
1
2
3
1
2
3
GROUND
GROUND
GROUND
Dwg. PH-003-7A
Dwg. PH-003-6
Pinning is shown viewed from branded side.
2
115 Northeast Cutoff, Box 15036 W Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2002, 2003 Allegro MicroSystems, Inc.
NO (INTERNAL) CONNECTION
SUPPLY
SUPPLY
3260 2-WIRE, CHOPPER-STABILIZED, PRECISION HALL-EFFECT BIPOLAR SWITCH
ELECTRICAL CHARACTERISTICS over operating temperature range.
Limits Characteristic Supply Voltage Output Current Chopping Frequency Output Slew Rate Output Settling Time Reverse Battery Current Symbol VCC IGND(L) IGND(H) fC di/dt tsd ICC CL = 20 pF CL = 20 pF VRCC = -16 V Test Conditions Operating B > BOP B < BRP Min. 3.5 -4.0 -11 - 0.5 -- - Typ. 12 -6.5 -14.5 340 -- -- - Max. 24 -8.0 -18 - 2.0 20 -15 Units V mA mA kHz mA/s s mA
NOTES: 1. BOP = operate point (output turns OFF); BRP = release point (output turns ON). 2. 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.
Limits Characteristic Operate Point Release Point Hysteresis Symbol BOP BRP Bhys BOP - BRP Test Conditions Min. - -40 2.0 Typ. 10 -10 20 Max. 40 - - Units G G G
NOTES: 1. Typical Data is at TA = +25C and VCC = 12 V and is for design information only. 2. 1 gauss (G) is exactly equal to 0.1 millitesla (mT).
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3
3260 2-WIRE, CHOPPER-STABILIZED, PRECISION HALL-EFFECT BIPOLAR SWITCH
SENSOR LOCATIONS
ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS
800
700 Suffix "-UA" RJA = 165C/W 600
Package Designator "LH"
ACTIVE AREA DEPTH 0.011" 0.28 mm NOM 0.059" 1.49 mm 3 0.038" 0.96 mm
500 Suffix "-LH" RJA = 228C/W 400
Suffix "-LT" RJA = 180C/W
300
A
1 2
Dwg. MH-025
200 Suffix "E-" 100 Suffix "L-" 0 20 40 60 100 80 120 AMBIENT TEMPERATURE in C 140 160 180
Dwg. GH-046-2D
Package Designator "LT"
ACTIVE AREA DEPTH 0.0305" 0.775 mm NOM
0.088" 2.24 mm 0.045" 1.14 mm
A
1 2 3
Allegro
Dwg. MH-008-8A
Package Designators "UA" and "UA-TL"
ACTIVE AREA DEPTH 0.0195" 0.50 mm NOM
0.080" 2.04 mm
0.056" 1.44 mm
A
BRANDED SURFACE 1 2 3
Dwg. MH-011-9B
Although sensor location is accurate to three sigma for a particular design, product improvements may result in small changes to sensor location.
4
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3260 2-WIRE, CHOPPER-STABILIZED, PRECISION HALL-EFFECT BIPOLAR SWITCH
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-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 (BRP). After turn-ON, the output will source current equal to the device operating current plus a current source (IGND(H)). When the magnetic field is increased (south pole) above the operate point (BOP), the output will source current equal to the Hall-effect sensor operating current with the current source turned OFF (IGND(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 (Bhys) of the device. The hysteresis allows clean switching of the output even in the presence of external mechanical vibration or 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. 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.
REG
X
B +V
--
HALL VOLTAGE
+
Dwg. AH-011-2
+I
IOUT + ICC
OUTPUT CURRENT
BRP
BOP
ICC
0 -B 0 FLUX DENSITY +B
Dwg. GH-034-6
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SAMPLE & HOLD
Dwg. EH-012
5
3260 2-WIRE, CHOPPER-STABILIZED, PRECISION HALL-EFFECT BIPOLAR SWITCH
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.
'UA' PACKAGE
0.95 V
- +
X
3
0.1 F
100 SUPPLY
1
2
Dwg. EH-011-2A
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
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6
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3260 2-WIRE, CHOPPER-STABILIZED, PRECISION HALL-EFFECT BIPOLAR SWITCH
PACKAGE DESIGNATOR 'LH'
(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
0.010
MIN
0.037
BSC
0 TO 8 0.0079 0.0050
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. 2. 3. 4. 5.
Tolerances on package height and width represent allowable mold offsets. Dimensions given are measured at the widest point (parting line). Exact body and lead configuration at vendor's option within limits shown. Height does not include mold gate flash. Where no tolerance is specified, dimension is nominal. Add "LT" to part number for tape and reel.
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7
3260 2-WIRE, CHOPPER-STABILIZED, PRECISION HALL-EFFECT BIPOLAR SWITCH
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.
8
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3260 2-WIRE, CHOPPER-STABILIZED, PRECISION HALL-EFFECT BIPOLAR SWITCH
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 A3260xUA-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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9
3260 2-WIRE, CHOPPER-STABILIZED, PRECISION HALL-EFFECT BIPOLAR SWITCH
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.
10
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
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