Data Sheet 27609.20e 3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES Suffix '–LT' & '–UA' Pinning (SOT89/TO-243AA & ultra-mini SIP) X 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 +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. PTCT CC 2 3 OUTPUT SUPPLY 1 GROUND V Dwg. PH-003-2 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. Three package styles provide a magnetically optimized package for most applications. Package type LH is a modified SOT23W surfacemount package, LT is a miniature SOT89/TO-243AA transistor package for surface-mount applications; while UA is a three-lead ultra-mini-SIP for through-hole mounting. Each package type is also available in a lead (Pb) free version (suffix, –T) , with a 100% matte tin plated leadframe. Pinning is shown viewed from branded side. ABSOLUTE MAXIMUM RATINGS at TA = +25°C 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 ................ +165°C Operating Temperature Range, TA Range ‘E’ ..................... -40°C to +85°C Range ‘L’.................... -40°C to +150°C Storage Temperature Range, TS .............................. -65°C to +170°C *Internal current limiting is intended to protect the device from output short circuits. FEATURES ■ ■ ■ ■ ■ ■ ■ ■ 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 3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES Product Selection Guide Part Number Pb-free1 Packing2 Mounting A3280ELHLT-T Yes 7-in. reel, 3000 pieces/reel SOT23W Surface Mount A3280ELT-T Yes Bulk, 500 pieces/bag A3280ELTTR-T Yes 7-in. reel, 1000 pieces/reel A3280EUA-T Yes Bulk, 500 pieces/bag 4-pin SIP through hole A3280LLHLT-T Yes 7-in. reel, 3000 pieces/reel SOT23W Surface Mount A3280LLT-T Yes Bulk, 500 pieces/bag A3280LLTTR-T Yes 7-in. reel, 1000 pieces/reel SOT89 Surface Mount SOT89 Surface Mount A3280LUA-T Yes Bulk, 500 pieces/bag 4-pin SIP through hole A3281ELHLT-T Yes 7-in. reel, 3000 pieces/reel SOT23W Surface Mount A3281ELT-T Yes Bulk, 500 pieces/bag A3281ELTTR-T Yes 7-in. reel, 1000 pieces/reel A3281EUA-T Yes Bulk, 500 pieces/bag 4-pin SIP through hole A3281LLHLT-T Yes 7-in. reel, 3000 pieces/reel SOT23W Surface Mount SOT89 Surface Mount A3281LLT-T Yes Bulk, 500 pieces/bag A3281LLTTR-T Yes 7-in. reel, 1000 pieces/reel A3281LUA-T Yes Bulk, 500 pieces/bag 4-pin SIP through hole A3283ELHLT-T Yes 7-in. reel, 3000 pieces/reel SOT23W Surface Mount A3283ELT-T Yes Bulk, 500 pieces/bag A3283ELTTR-T Yes 7-in. reel, 1000 pieces/reel A3283EUA-T Yes Bulk, 500 pieces/bag 4-pin SIP through hole A3283LLHLT-T Yes 7-in. reel, 3000 pieces/reel SOT23W Surface Mount A3283LLT-T Yes Bulk, 500 pieces/bag A3283LLTTR-T Yes 7-in. reel, 1000 pieces/reel A3283LUA-T Yes Bulk, 500 pieces/bag SOT89 Surface Mount SOT89 Surface Mount SOT89 Surface Mount Ambient, TA (°C) BRP(MIN) (TA = 25°C) (G) BOP(MAX) (TA = 25°C) (G) –40 40 –90 90 –180 180 –40 to 85 –40 to 150 –40 to 85 –40 to 150 –40 to 85 –40 to 150 4-pin SIP through hole 1Pb-based variants are being phased out of the product line. a. Certain variants cited in this footnote are in production but have been determined to be LAST TIME BUY. This classification indicates that sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Status change: October 31, 2006. Deadline for receipt of LAST TIME BUY ORDERS: April 27, 2007. These variants include: A3281ELTTR, A3283ELT, A3283ELTTR, and A3283EUA. b. Certain variants cited in this footnote are in production but have been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of this device is currently restricted to existing customer applications. The variants should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Status change: May 1, 2006. These variants include: A3280ELHLT, A3280ELT, A3280ELTTR, A3280EUA, A3280LLHLT, A3280LLT, A3280LLTTR, A3280LUA, A3281ELHLT, A3281ELT, A3281EUA, A3281LLHLT, A3281LLT, A3281LLTTR, A3281LUA, A3283ELHLT, A3283LLHLT, A3283LLT, A3283LLTTR, and A3283LUA 2Contact Allegro for additional packing options. www.allegromicro.com 2 3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES FUNCTIONAL BLOCK DIAGRAM SUPPLY TO ALL SUBCIRCUITS LOW-PASS FILTER OUTPUT SAMPLE & HOLD X DYNAMIC OFFSET CANCELLATION REG. CONTROL CURRENT LIMIT <1Ω GROUND Dwg. FH-020-1 Suffix ‘–LH’ Pinning (SOT23W) 3 700 Suffix "–UA" RθJA = 165°C/W X 600 500 PTCT Suffix "–LT" RθJA = 180°C/W Suffix "–LH" RθJA = 228°C/W 400 V 300 CC 1 20 40 60 100 80 120 AMBIENT TEMPERATURE in °C 140 160 180 Dwg. GH-046-2D 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 2000, 2003, 2004 Allegro MicroSystems, Inc. OUTPUT Suffix "L–" GROUND Suffix "E–" 100 0 3 2 200 SUPPLY ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS 800 Dwg. PH-003-4 3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES ELECTRICAL CHARACTERISTICS over operating temperature range. Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units 4.2 – 24 V Supply Voltage Range VCC Operating, TJ < 165°C1 Output Leakage Current IOFF VOUT = 24 V, B < BRP – – 10 µA VOUT(SAT) IOUT = 20 mA, B > BOP – 185 500 mV Output Saturation Voltage Output Current Limit IOM B > BOP 30 – 60 mA Power-On Time tpo VCC > 4.2 V – – 50 µs Chopping Frequency fC – 340 – kHz Output Rise Time tr RL = 820 Ω, CL = 20 pF – 0.2 2.0 µs Output Fall Time tf RL = 820 Ω, CL = 20 pF – 0.1 2.0 µs B < BRP, VCC = 12 V – 3.0 8.0 mA B > BOP, VCC = 12 V – 4.0 8.0 mA VRCC = -30 V – – -5.0 mA Supply Current ICC Reverse Battery Current ICC Zener Voltage VZ + VD ICC = 15 mA, TA = 25°C 28 32 37 V Zener Impedance zz + z D ICC = 15 mA, TA = 25°C – 50 – 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 voltage range. Part Numbers1 A3280 Characteristic Test Conditions Operate Point, BOP at TA = +25°C and TA = max. 5.0 22 40 15 50 at TA = -40°C 5.0 – 40 15 at TA = +25°C and TA = max. -40 -23 -5.0 at TA = -40°C -40 – at TA = +25°C and TA = max. 10 at TA = -40°C – Release Point, BRP Hysteresis, Bhys (BOP - BRP) Min. A3281 Typ. Max. Min. A3283 Typ. Max. Min. Typ. Max. Units 90 100 150 180 G – 90 100 – 200 G -90 -50 -15 -180 -150 -100 G -5.0 -90 – -15 -200 – -100 G 45 80 30 100 180 – 300 360 G – 80 – – 180 – – 360 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. 4. 1 gauss (G) is exactly equal to 0.1 millitesla (mT). www.allegromicro.com 4 3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES TYPICAL OPERATING CHARACTERISTICS as a function of temperature A3281* SWITCH POINTS A3280* SWITCH POINTS 50 100 40 80 60 OPERATE POINT SWITCH POINTS IN GAUSS SWITCH POINTS IN GAUSS 30 20 10 0 VCC = 4.5 V VCC = 24 V -10 RELEASE POINT -20 20 0 -40 -60 -40 -80 -25 0 25 50 75 100 AMBIENT TEMPERATURE IN °C 125 150 Dwg. GH-026-3 VCC = 4.5 V to 24 V -20 -30 -50 -50 OPERATE POINT 40 -100 -50 RELEASE POINT -25 0 25 50 75 100 125 AMBIENT TEMPERATURE IN ° C A3283* SWITCH POINTS 200 160 OPERATE POINT SWITCH POINTS IN GAUSS 120 80 40 0 VCC = 4.5 V VCC = 24 V -40 -80 -120 RELEASE POINT -160 -200 -50 -25 0 25 50 75 100 AMBIENT TEMPERATURE IN ° C 125 150 Dwg. GH-026-6 * Complete part number includes a suffix denoting operating temperature range (E or L) and package type (LH, LT, or UA). 5 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 150 Dwg. GH-026-4 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 IOUT = 20 mA VCC = 12 V 5.0 SUPPLY CURRENT IN mA SATURATION VOLTAGE IN mV VCC = 12 V 200 100 4.0 OUTPUT ON, B > BOP 3.0 OUTPUT OFF, B < BRP 0 -50 -25 0 25 50 75 100 125 2.0 -50 150 -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 OPERATE POINT OPERATE POINT 40 TA = 150°C TA = -40°C 0 -20 -40 3.0 SWITCH POINT IN GAUSS SWITCH POINT IN GAUSS 20 RELEASE POINT 3.5 4.0 4.5 5.0 24 TA = 150°C TA = -40°C 0 -40 -80 3.0 RELEASE POINT 3.5 4.0 4.5 5.0 24 SUPPLY VOLTAGE IN VOLTS SUPPLY VOLTAGE IN VOLTS Dwg. GH-021-3 Dwg. GH-021-1 * Complete part number includes a suffix denoting operating temperature range (E or L) and package type (LH, LT, or UA). www.allegromicro.com 6 3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES TYPICAL OPERATING CHARACTERISTICS as a function of supply voltage (cont’d) SENSOR LOCATIONS OUTPUT SATURATION VOLTAGE Package Designator ‘LH’ 250 ACTIVE AREA DEPTH 0.011" 0.28 mm NOM IOUT = 20 mA TA = 150°C TA = +25°C TA = -40°C 0.059" 1.49 mm 3 SATURATION VOLTAGE IN mV 0.038" 0.96 mm A 1 2 Dwg. MH-025 Package Designator ‘LT’ ACTIVE AREA DEPTH 0.0305" 0.775 mm NOM 225 200 175 0.088" 2.24 mm 0.045" 1.14 mm 150 3.0 3.5 4.0 4.5 24 5.0 SUPPLY VOLTAGE IN VOLTS A Dwg. GH-055-1 1 2 3 SUPPLY CURRENT Dwg. MH-008-8A 8.0 Package Designator ‘UA’ ACTIVE AREA DEPTH 0.0195" 0.50 mm NOM 7.0 6.0 SUPPLY CURRENT IN mA 0.080" 2.04 mm 0.056" 1.44 mm A BRANDED SURFACE 1 2 OUTPUT ON TA = 150°C TA = +25°C TA = -40°C 3 5.0 4.0 3.0 2.0 1.0 Dwg. MH-011-9B 0 3.0 Although sensor location is accurate to three sigma for a particular design, product improvements may result in small changes to sensor location. 7 4.0 5.0 6.0 7.0 8.0 9.0 SUPPLY VOLTAGE IN VOLTS Allegro 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 10 11 12 Dwg. GH-058-4 3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES FUNCTIONAL DESCRIPTION SAMPLE & HOLD REG X Dwg. EH-012 B +V — HALL VOLTAGE + Dwg. AH-011-2 +V VCC OUTPUT VOLTAGE 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. B RP B OP VOUT(SAT) 0 -B 0 FLUX DENSITY www.allegromicro.com +B Dwg. GH-034-5 8 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. 3 SUPPLY 2 PTCT OUTPUT 1 SUPPLY V CC 0.1 µF X Dwg. EH-013 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 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. 9 115 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) 3.10 2.90 0.122 0.114 0.50 0.30 0.020 0.012 0.083 0.073 3 1 2 0.118 0.106 2.10 1.85 0.010 BSC 3.00 2.70 3 1 2 SEATING PLANE REF 0° TO 8° 0.037 0.006 0.000 SEATING PLANE 0.55 0.010 REF 0.045 0.032 0° TO 8° 0.95 MIN BSC BSC GAUGE PLANE GAUGE PLANE 0.022 0.25 MIN BSC 0.0079 0.0050 0.15 0.00 0.25 0.20 0.127 1.13 0.87 Dwg. MA-010-3D mm Dwg. MA-010-3D in 0.70 0.028 3 3 0.039 1.00 0.094 1 2 2.40 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 10 3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES PACKAGE DESIGNATOR ‘LT’ (SOT89/TO-243AA) Dimensions in Inches (for reference only) 0.181 0.173 0.072 0.064 0.167 0.155 2 1 0.063 0.055 3 Dimensions in Millimeters (controlling dimensions) 0.0173 0.0138 0.090 0.084 0.102 0.090 4.25 3.94 0.0189 0.0142 0.0221 0.0173 0.047 0.035 0.059 BSC 4.60 4.40 1.83 1.62 2 1 BSC 3.00 BSC Dwg. MA-009-3A in B 0.031 A Dwg. MA-009-3A mm 2.5 2.0 0.098 0.079 B 0.102 0.8 2.6 A 0.181 1 2 2.29 2.13 0.56 0.44 1.50 BSC 2.60 2.29 3 4.6 3 0.047 0.028 0.031 TYP TYP 1 2 3 1.2 0.7 0.8 TYP TYP 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 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 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 (≤240°C) reflow-soldering techniques are recommended for SOT89 devices. 11 0.44 0.35 0.48 0.36 1.20 0.89 0.118 1.60 1.40 115 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 Millimeters (for reference only) Dimensions in Inches (controlling dimensions) 0.164 0.159 4.17 4.04 0.062 0.058 45° 1.57 1.47 45° 3.10 2.97 0.122 0.117 45° 45° 0.085 1 2 3 0.031 2.16 1 2 3 0.79 MAX MAX 16.26 15.24 0.0173 0.0138 0.640 0.600 0.0189 0.0142 SEE NOTE 0.48 0.36 SEE NOTE 1.27 0.050 BSC 0.44 0.35 Dwg. MH-014E in BSC Dwg. MH-014E 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. 6. Supplied in bulk pack (500 pieces per bag). www.allegromicro.com 12