3281

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 +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. 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. Data Sheet 27609.20e X PTCT V CC 1 2 3 GROUND SUPPLY Dwg. PH-003-2 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. OUTPUT 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 Ambient, TA (°C) BRP(MIN) (TA = 25°C) (G) BOP(MAX) (TA = 25°C) (G) A3280ELHLT-T A3280ELT-T A3280ELTTR-T A3280EUA-T A3280LLHLT-T A3280LLT-T A3280LLTTR-T A3280LUA-T A3281ELHLT-T A3281ELT-T A3281ELTTR-T A3281EUA-T A3281LLHLT-T A3281LLT-T A3281LLTTR-T A3281LUA-T A3283ELHLT-T A3283ELT-T A3283ELTTR-T A3283EUA-T A3283LLHLT-T A3283LLT-T A3283LLTTR-T A3283LUA-T 1Pb-based Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes 7-in. reel, 3000 pieces/reel Bulk, 500 pieces/bag 7-in. reel, 1000 pieces/reel Bulk, 500 pieces/bag 7-in. reel, 3000 pieces/reel Bulk, 500 pieces/bag 7-in. reel, 1000 pieces/reel Bulk, 500 pieces/bag 7-in. reel, 3000 pieces/reel Bulk, 500 pieces/bag 7-in. reel, 1000 pieces/reel Bulk, 500 pieces/bag 7-in. reel, 3000 pieces/reel Bulk, 500 pieces/bag 7-in. reel, 1000 pieces/reel Bulk, 500 pieces/bag 7-in. reel, 3000 pieces/reel Bulk, 500 pieces/bag 7-in. reel, 1000 pieces/reel Bulk, 500 pieces/bag 7-in. reel, 3000 pieces/reel Bulk, 500 pieces/bag 7-in. reel, 1000 pieces/reel Bulk, 500 pieces/bag SOT23W Surface Mount SOT89 Surface Mount 4-pin SIP through hole SOT23W Surface Mount SOT89 Surface Mount 4-pin SIP through hole SOT23W Surface Mount SOT89 Surface Mount 4-pin SIP through hole SOT23W Surface Mount SOT89 Surface Mount 4-pin SIP through hole SOT23W Surface Mount SOT89 Surface Mount 4-pin SIP through hole SOT23W Surface Mount SOT89 Surface Mount 4-pin SIP through hole –40 to 150 –40 to 85 –180 180 –40 to 150 –40 to 85 –90 90 –40 to 150 –40 to 85 –40 40 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 REG. TO ALL SUBCIRCUITS DYNAMIC OFFSET CANCELLATION OUTPUT SAMPLE & HOLD X LOW-PASS FILTER CONTROL CURRENT LIMIT BOP, VCC = 12 V Reverse Battery Current Zener Voltage Zener Impedance ICC VZ + VD zz + z D VRCC = -30 V ICC = 15 mA, TA = 25°C ICC = 15 mA, TA = 25°C Test Conditions Operating, TJ < 165°C1 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 µA mV mA µs kHz µs µs mA mA mA V 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 Operate Point, BOP Test Conditions at TA = +25°C and TA = max. at TA = -40°C Release Point, BRP at TA = +25°C and TA = max. at TA = -40°C Hysteresis, Bhys at TA = +25°C and TA = max. at TA = -40°C 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 = +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 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). 5 115 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 = 150°C TA = -40°C 0 TA = 150°C TA = -40°C -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). www.allegromicro.com 6 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 IOUT = 20 mA TA = 150°C TA = +25°C TA = -40°C Package Designator ‘LH’ ACTIVE AREA DEPTH 0.011" 0.28 mm NOM A 1 2 Dwg. MH-025 SATURATION VOLTAGE IN mV 0.038" 0.96 mm 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 = 150°C TA = +25°C TA = -40°C 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 7 115 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 www.allegromicro.com 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. SUPPLY 3 OUTPUT PTCT 2 0.1 µF 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 9 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 3.10 2.90 0.50 0.30 0.020 0.012 0.083 0.073 3 1 2 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° 0.010 MIN REF 0.95 BSC 0° TO 8° 0.20 0.127 0.25 MIN 0.006 0.000 0.045 0.032 0.0079 0.0050 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. 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) 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 0.028 TYP 2 1 0.7 TYP 2 3 1.2 0.8 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 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 (≤240°C) reflow-soldering techniques are recommended for SOT89 devices. 11 115 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) Dimensions in Millimeters (for reference only) 0.164 0.159 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 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