Data Sheet 27609.20 3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES X Suffix '–LT' & '–UA' Pinning PTCT CC 2 3 OUTPUT SUPPLY 1 GROUND V 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 ....................... Internally Limited Reverse Output Current, IOUT ........ -50 mA Package Power Dissipation, PD . See Graph Junction Temperature, TJ ............... +170°C Operating Temperature Range, TA Suffix ‘E–’ .................. -40°C to +85°C Suffix ‘L–’ ................ -40°C to +150°C Storage Temperature Range, TS .............................. -65°C to +170°C 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. The first character of the part number suffix determines the device operating temperature range; suffix ‘E–’ is for -40°C to +85°C and ‘L–’ is -40°C to +150°C. 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. 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 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 TO ALL SUBCIRCUITS DYNAMIC OFFSET CANCELLATION REG. LOW-PASS FILTER OUTPUT SAMPLE & HOLD X CONTROL CURRENT LIMIT <1Ω GROUND Dwg. FH-020-1 Suffix ‘–LH’ Pinning 3 Suffix "–UA" RθJA = 206°C/W 400 Suffix "–LT" RθJA = 258°C/W PTCT Suffix "–LH" RθJA = 248°C/W 300 V 100 Suffix "E–" Suffix "L–" 20 40 60 80 120 100 AMBIENT TEMPERATURE in °C 140 160 180 Dwg. GH-046-2C 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 2000 Allegro MicroSystems, Inc. 2 GROUND 1 200 0 2 CC OUTPUT 500 X 600 SUPPLY ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS 700 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 < 170°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 supply 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 – – 400 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. www.allegromicro.com 3 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 AMBIENT TEMPERATURE IN °C 100 125 150 Dwg. GH-026-6 * Complete part number includes a suffix denoting operating temperature range (E or L) and package type (LH, LT, or UA). 4 115 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 5 3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES TYPICAL OPERATING CHARACTERISTICS as a function of supply voltage (cont’d) SENSOR LOCATIONS (±0.005" [0.13 mm] die placement) 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 0.030" 0.76 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-008-8 8.0 Package Designators ‘UA’ and ‘UA-TL’ ACTIVE AREA DEPTH 0.018" 0.46 mm NOM SUPPLY CURRENT IN mA A 1 2 7.0 6.0 0.080" 2.04 mm 0.056" 1.44 mm BRANDED SURFACE OUTPUT ON TA = 150°C TA = +25°C TA = -40°C 3 5.0 4.0 3.0 2.0 1.0 Dwg. MH-011-9A 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. 6 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 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 Test Method and Test Conditions Test Length Samples Biased Humidity (HAST) TA = 130°C, RH = 85% 50 hrs 77 VCC = VOUT = 5 V High-Temperature Operating Life (HTOL) JESD22-A108, TA = 150°C, TJ ≤ 170°C 408 hrs 77 VCC = 24 V, VOUT = 20 V Accelerated HTOL TA = 175°C, TJ ≤ 190°C 504 hrs 77 VCC = 24 V, VOUT = 20 V Autoclave, Unbiased JESD22-A102, Condition C, TA = 121°C, 15 psig 96 hrs 77 High-Temperature (Bake) Storage Life MIL-STD-883, Method 1008, TA = 170°C 1000 hrs 77 Temperature Cycle MIL-STD-883, Method 1010, -65°C to +150°C 500 cycles 77 Latch-Up — Pre/Post Reading 6 Electro-Thermally Induced Gate Leakage — Pre/Post Reading 6 ESD, Human Body Model CDF-AEC-Q100-002 Pre/Post Reading 3 per test Test to failure, All leads > 1500 V ESD, Macine Model JESD22-A115 Pre/Post Reading 3 per test Test to failure, All leads > 200 V Electrical Distributions Per Specification — 30 www.allegromicro.com Comments 7 3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES FUNCTIONAL DESCRIPTION SAMPLE & HOLD REG X B +V Dwg. EH-012 — HALL VOLTAGE + Dwg. AH-011-2 +V OUTPUT VOLTAGE VCC B RP B OP VOUT(SAT) 0 -B 0 Dwg. GH-034-5 3 SUPPLY 2 PTCT OUTPUT 1 V CC 0.1 µF www.allegromicro.com 8 +B FLUX DENSITY X 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. 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 SUPPLY Dwg. EH-013 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES PACKAGE DESIGNATOR ‘LH’ (fits SC-74A solder-pad layout) Dimensions in Inches (for reference only) 3.10 2.90 0.122 0.114 0.020 0.012 0.083 0.073 0.0079 0.0050 0.118 0.106 3 1 2 0.020 MIN 0.022 REF Dimensions in Millimeters (controlling dimensions) 3 1 2 3.00 2.70 0.25 MIN 0° TO 8° REF 0.037 0.006 0.000 2.10 1.85 0.20 0.127 0.55 0° TO 8° BSC 0.50 0.30 0.95 BSC 0.043 0.035 0.049 0.035 0.15 0.00 1.10 0.90 1.25 0.90 Dwg. MA-010-3B mm Dwg. MA-010-3B 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 9 3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES PACKAGE DESIGNATOR ‘LT’ (SOT-89/TO-243AA) Dimensions in Inches (for reference only) 0.181 0.173 0.072 0.064 0.167 0.155 0.063 0.055 2 1 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 1 BSC 3.00 BSC Dwg. MA-009-3A in Dwg. MA-009-3A mm 2.5 2.0 0.098 0.079 B 0.031 A 0.102 0.8 2.6 A 0.181 1 2 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 SOT-89 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 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 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. 10 2.29 2.13 0.56 0.44 1.50 BSC 2.60 2.29 3 0.44 0.35 0.48 0.36 1.20 0.89 0.118 B 2 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 0.640 0.600 16.26 15.24 0.0173 0.0138 0.0189 0.0142 SEE NOTE 0.44 0.35 0.48 0.36 SEE NOTE 1.27 0.050 BSC BSC Dwg. MH-014E in Dwg. MH-014E mm Surface-Mount Lead Form (order A328xxUA-TL) 0.095 2.41 ±0.005 0.002 0.051 MAX MAX 0.004 0°–8° MAX ±0.13 0.10 0.020 MIN FLAT MAX Dwg. MH-015 in 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. 6. Supplied in bulk pack (500 pieces per bag). www.allegromicro.com 11 3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES 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. 12 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000