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3240 Suffix `-LT' & `-UA' Pinning 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 +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 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. The first character of the part number suffix determines the device operating temperature range; suffix `E-' is for -40C to +85C and `L-' is -40C to +150C. Three package styles provide a magnetically optimized package for most applications. Suffix `-LH' is a modified SOT-23 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. Data Sheet 27621.20 X PTCT V CC 1 2 3 GROUND Dwg. PH-003-2 Pinning is shown viewed from branded side. ABSOLUTE MAXIMUM RATINGS at TA = +25C 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 ............... +170C Operating Temperature Range, TA Suffix `E-' .................. -40C to +85C Suffix `L-' ................ -40C to +150C Storage Temperature Range, TS .............................. -65C to +170C OUTPUT SUPPLY FEATURES I I I I I I I 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., A3240ELH . 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 <1 GROUND Dwg. FH-020-1 700 ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS Suffix `-LH' Pinning 600 3 500 Suffix "-UA" RJA = 206C/W 400 X Suffix "-LT" RJA = 258C/W Suffix "-LH" RJA = 248C/W PTCT 300 V 200 CC 1 2 GROUND 100 Suffix "E-" 0 20 40 60 80 120 100 AMBIENT TEMPERATURE in C 140 160 180 Suffix "L-" Dwg. PH-003-4 Dwg. GH-046-2C 2 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2000 Allegro MicroSystems, Inc. OUTPUT SUPPLY 3240 CHOPPER-STABILIZED, PRECISION HALL-EFFECT SWITCH ELECTRICAL CHARACTERISTICS over operating temperature range. Limits Characteristic Supply Voltage Range Output Leakage Current Output Saturation Voltage Output Current Limit Power-On Time Chopping Frequency Output Rise Time Output Fall Time Supply Current Symbol VCC IOFF VOUT(SAT) IOM tpo fC tr tf ICC RL = 820 , CL = 20 pF RL = 820 , CL = 20 pF B < BRP, VCC = 12 V B > BOP, VCC = 12 V Reverse Battery Current Zener Voltage Zener Impedance ICC VZ + VD zz + z D VRCC = -30 V ICC = 15 mA, TA = 25C ICC = 15 mA, TA = 25C Test Conditions Operating, TJ < 170C1 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 A mV mA s kHz s s mA mA mA V 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 = +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. - 5.0 - Typ. 35 25 10 Max. 50 - - Units G G G NOTE: Typical Data is at TA = +25C and VCC = 12 V and is for design information only. www.allegromicro.com 3 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 4 115 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 = 150C TA = -40C 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 = 150C TA = +25C TA = -40C SUPPLY CURRENT 8.0 7.0 6.0 OUTPUT ON TA = 150C TA = +25C TA = -40C 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 5 3240 CHOPPER-STABILIZED, PRECISION HALL-EFFECT SWITCH SENSOR LOCATIONS (0.005" [0.13 mm] die placement) 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 0.030" 0.76 mm NOM 0.088" 2.24 mm 0.045" 1.14 mm A 1 2 3 Dwg. MH-008-8 Package Designators `UA' and `UA-TL' ACTIVE AREA DEPTH 0.018" 0.46 mm NOM 0.080" 2.04 mm Allegro 0.056" 1.44 mm A BRANDED SURFACE 1 2 3 Dwg. MH-011-9A Although sensor location is accurate to three sigma for a particular design, product improvements may result in small changes to sensor location. 6 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 3240 CHOPPER-STABILIZED, PRECISION HALL-EFFECT SWITCH 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 Biased Humidity (HAST) High-Temperature Operating Life (HTOL) Accelerated HTOL Test Method and Test Conditions TA = 130C, RH = 85% JESD22-A108, TA = 150C, TJ 170C TA = 175C, TJ = 190C Test Length 50 hrs 408 hrs Samples 77 77 Comments VCC = VOUT = 5 V VCC = 24 V, VOUT = 20 V VCC = 24 V, VOUT = 20 V 504 hrs 77 Autoclave, Unbiased JESD22-A102, Condition C, TA = 121C, 15 psig MIL-STD-883, Method 1008, TA = 170C MIL-STD-883, Method 1010, -65C to +150C -- 96 hrs 77 High-Temperature (Bake) Storage Life Temperature Cycle 1000 hrs 77 500 cycles 77 Latch-Up Pre/Post Reading Pre/Post Reading Pre/Post Reading Pre/Post Reading -- 6 Electro-Thermally Induced Gate Leakage ESD, Human Body Model ESD, Macine Model Electrical Distributions -- 6 CDF-AEC-Q100-002 3 per test 3 per test 30 Test to failure, All leads > 1500 V Test to failure, All leads > 200 V JESD22-A115 Per Specification www.allegromicro.com 7 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 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 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 OUTPUT PTCT 2 0.1 F CC 1 www.allegromicro.com V Dwg. EH-013 8 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 SAMPLE & HOLD Dwg. EH-012 X SUPPLY 3240 CHOPPER-STABILIZED, PRECISION HALL-EFFECT SWITCH PACKAGE DESIGNATOR `LH' (fits SC-74A 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 0.022 REF 3 1 2 3.10 2.90 0.0079 0.0050 0.118 0.106 0.020 MIN 0.50 0.30 2.10 1.85 0.55 REF 3 1 2 0.20 0.127 3.00 2.70 0.25 MIN 0 TO 8 0.037 BSC 0 TO 8 0.95 BSC 0.006 0.000 0.043 0.035 0.049 0.035 Dwg. MA-010-3B in 0.15 0.00 1.10 0.90 1.25 0.90 Dwg. MA-010-3B 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 9 3240 CHOPPER-STABILIZED, PRECISION HALL-EFFECT SWITCH PACKAGE DESIGNATOR `LT' (SOT-89/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 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 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 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. 10 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 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 Surface-Mount Lead Form (order A3240xUA-TL) 0.095 0.005 2.41 0.13 0.002 MAX 0.051 MAX 0.004 0-8 MAX 0.020 MIN FLAT Dwg. MH-015 in 0.10 MAX 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 3240 CHOPPER-STABILIZED, PRECISION HALL-EFFECT 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. 12 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 |
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