A3240LUA-T

3240 Suffix ‘–LT’ & ‘–UA’ Pinning (SOT89/TO-243AA & ultra-min SIP) CHOPPER-STABILIZED, PRECISION HALL-EFFECT SWITCH The A3240-- Hall-effect switch is an extremely temperature-stable and stress-resistant sensor 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 device includes on a single silicon chip a voltage regulator, Hallvoltage 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. An on-board regulator permits operation with supply voltages of 4.2 to 24 volts. 3 Data Sheet 27621.20d X PTCT V CC 1 2 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. The LH and UA packages are also available in a lead (Pb) free version (suffix, –T) , with a 100% matte tin plated leadframe. 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 ■ ■ ■ ■ ■ ■ ■ Resistant to Physical Stress Superior Temperature Stability Output Short-Circuit Protection Operation From Unregulated Supply Reverse Battery Protection Solid-State Reliability Small Size 3240 CHOPPER-STABILIZED, PRECISION HALL-EFFECT SWITCH Product Selection Guide Part Number A3240ELHLT-T A3240EUA-T A3240LLHLT-T A3240LUA-T 1Pb-based Pb-free1 Yes Yes Yes Yes Packing2 Mounting Ambient, TA (ºC) –40 to 85 BRP(MIN) (G) BOP(MAX) (G) 7-in. reel, 3000 pieces/reel Surface Mount Bulk, 500 pieces/bag Bulk, 500 pieces/bag SIP through hole SIP through hole 7-in. reel, 3000 pieces/reel Surface Mount 5.0 –40 to 150 50 variants are being phased out of the product line. 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 device 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: A3240ELHLT, A3240ELT, A3240ELTTR, A3240EUA, A3240LLHLT, A3240LLT, A3240LLTTR, and A3240LUA. 2Contact Allegro for additional packing options. www.allegromicro.com 2 3240 CHOPPER-STABILIZED, PRECISION HALL-EFFECT SWITCH FUNCTIONAL BLOCK DIAGRAM SUPPLY REG. TO ALL SUBCIRCUITS DYNAMIC OFFSET CANCELLATION OUTPUT LOW-PASS FILTER SAMPLE & HOLD X 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 6.0 6.0 -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 supply voltage and temperature ranges. Limits Characteristic Operate Point Release Point Hysteresis Symbol BOP BRP Bhys BOP - BRP Test Conditions Min. – 5.0 – Typ. 35 25 10 Max. 50 – – Units G G G NOTES: 1. Typical Data is at TA = +25°C and VCC = 12 V and is for design information only. 2. 1 gauss (G) is exactly equal to 0.1 millitesla (mT). www.allegromicro.com 4 3240 CHOPPER-STABILIZED, PRECISION HALL-EFFECT SWITCH TYPICAL OPERATING CHARACTERISTICS as a function of temperature SWITCH POINTS 50 40 SWITCH POINTS IN GAUSS OPERATE POINT 30 RELEASE POINT 20 10 VCC = 4.5 V VCC = 24 V 0 -50 -25 0 25 50 75 100 125 150 AMBIENT TEMPERATURE IN ° C Dwg. GH-026-5 OUTPUT SATURATION VOLTAGE 300 SUPPLY CURRENT 6.0 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 5 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 3240 CHOPPER-STABILIZED, PRECISION HALL-EFFECT SWITCH TYPICAL OPERATING CHARACTERISTICS as a function of supply voltage SWITCH POINTS 40 OPERATE POINT 30 SWITCH POINT IN GAUSS RELEASE POINT 20 TA = 150°C TA = -40°C 10 0 3.0 3.5 4.0 4.5 5.0 24 Dwg. GH-021-2 SUPPLY VOLTAGE IN VOLTS OUTPUT SATURATION VOLTAGE 250 IOUT = 20 mA TA = 150°C TA = +25°C TA = -40°C SUPPLY CURRENT 8.0 7.0 6.0 OUTPUT ON TA = 150°C TA = +25°C TA = -40°C SATURATION VOLTAGE IN mV 225 SUPPLY CURRENT IN mA 5.0 4.0 3.0 2.0 1.0 200 175 150 3.0 3.5 4.0 4.5 5.0 24 Dwg. GH-055-1 0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10 11 12 SUPPLY VOLTAGE IN VOLTS SUPPLY VOLTAGE IN VOLTS Dwg. GH-058-4 www.allegromicro.com 6 3240 CHOPPER-STABILIZED, PRECISION HALL-EFFECT SWITCH SENSOR LOCATIONS Package Designator ‘LH’ ACTIVE AREA DEPTH 0.011" 0.28 mm NOM 0.059" 1.49 mm 3 0.038" 0.96 mm A 1 2 Dwg. MH-025 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 Dwg. MH-008-8A Package Designator ‘UA’ ACTIVE AREA DEPTH 0.0195" 0.50 mm NOM 0.080" 2.04 mm 0.056" 1.44 mm 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 A BRANDED SURFACE 1 2 3 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. Dwg. MH-011-9B 7 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 3240 CHOPPER-STABILIZED, PRECISION HALL-EFFECT SWITCH 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 (south pole) 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). 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 Application Note 27701, or at REG X B +V — HALL VOLTAGE + Dwg. AH-011-2 +V VCC OUTPUT VOLTAGE B RP B OP VOUT(SAT) 0 0 FLUX DENSITY +B Dwg. GH-007-2 SUPPLY 3 PTCT www.allegromicro.com CC 2 0.1 µF 1 V www.allegromicro.com SAMPLE & HOLD Dwg. EH-012 OUTPUT X SUPPLY Dwg. EH-013 8 3240 CHOPPER-STABILIZED, PRECISION HALL-EFFECT 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 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 0.010 MIN 0.037 BSC 0° TO 8° 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. 9 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 3240 CHOPPER-STABILIZED, PRECISION HALL-EFFECT 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 (≤240°C) reflow-soldering techniques are recommended for SOT89 devices. www.allegromicro.com 10 3240 CHOPPER-STABILIZED, PRECISION HALL-EFFECT 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 Ra 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). 11 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000