ACS717 High Isolation, Linear Current Sensor IC with 850 µΩ Current Conductor FEATURES AND BENEFITS DESCRIPTION • IEC/UL 60950-1 Ed. 2 certified to: □□ Dielectric Strength = 4800 Vrms (tested for 60 seconds) □□ Basic Isolation = 1550 Vpeak □□ Reinforced Isolation = 800 Vpeak • Small footprint, low-profile SOIC16 wide-body package suitable for space constrained applications that require high galvanic isolation • 0.85 mΩ primary conductor for low power loss and high inrush current withstand capability • Low, 400 μARMS√Hz noise density results in typical input referred noise of 70 mA(rms) at max bandwidth (40 kHz) • 3.3 V, single supply operation • Output voltage proportional to AC or DC current • Factory-trimmed sensitivity and quiescent output voltage for improved accuracy • Chopper stabilization results in extremely stable quiescent output voltage • Ratiometric output from supply voltage pe d Ty ste te TÜV America Certificate Number: U8V 14 11 54214 030 CB 14 11 54214 029 The Allegro™ ACS717 current sensor IC is an economical, high isolation solution for AC or DC current sensing in industrial, commercial, and communications systems. The small package is ideal for space constrained applications, though the widebody provides the creepage and clearance needed for high isolation. Typical applications include motor control, load detection and management, switched-mode power supplies, and overcurrent fault protection. The device consists of a low-offset, linear Hall sensor circuit with a copper conduction path located near the surface of the die. Applied current flowing through this copper conduction path generates a magnetic field which is sensed by the integrated Hall IC and converted into a proportional voltage. Device accuracy is optimized through the close proximity of the magnetic field to the Hall transducer. A proportional voltage is provided by the low-offset, chopper-stabilized BiCMOS Hall IC, which is programmed for accuracy after packaging. The output of the device has a positive slope when an increasing current flows through the primary copper conduction path (from pins 1 through 4, to pins 5 through 8), which is the path used for current sensing. The internal resistance of this conductive path is 0.85 mΩ typical, providing low power loss. CB Certificate Number: US-22339-A1-UL The terminals of the conductive path are electrically isolated from the sensor leads (pins 10 through 15 ). This allows the ACS717 current sensor IC to be used in high-side current sense applications without the use of high-side differential amplifiers or other costly isolation techniques. Package: 16-Pin SOICW (suffix MA) The ACS717 is provided in a small, low profile surface mount SOICW16 package (suffix MA). The device is lead (Pb) free with 100% matte tin leadframe plating. The device is fully calibrated prior to shipment from the factory. Approximate Scale 1:1 +IP NC 1 IP+ 2 IP+ 3 IP+ 4 IP+ IP GND NC ACS717 NC VIOUT –IP 5 IP– 6 IP– 7 IP– 8 IP– NC VCC NC 16 15 14 13 12 11 10 9 Typical Application ACS717-DS CL The ACS717 outputs an analog signal, VIOUT , that changes, proportionally, with the bidirectional AC or DC primary sensed current, IP , within the specified measurement range. CBYPASS 0.1 µF High Isolation Linear Current Sensor IC with 850 µΩ Current Conductor ACS717 SPECIFICATIONS Selection Guide Part Number IP (A) Sens(Typ) at VCC = 3.3 V (mV/A) ACS717KMATR-10B-T2 ±10 132 ACS717KMATR-20B-T2 ±20 66 TA (°C) Packing1 -40 to 125 Tape and reel, 1000 pieces per reel 1Contact Allegro 2Variant for additional packing options. not intended for automotive applications. Absolute Maximum Ratings Characteristic Supply Voltage Symbol Rating Units VCC Notes 7 V Reverse Supply Voltage VRCC –0.1 V Output Voltage VIOUT 25 V Reverse Output Voltage VRIOUT –0.1 V –40 to 125 °C Operating Ambient Temperature TA Range K Junction Temperature TJ(max) 165 °C Storage Temperature Tstg –65 to 165 °C Isolation Characteristics Characteristic Dielectric Strength Test Voltage Symbol Notes Rating Unit VISO Agency type tested for 60 seconds per IEC/UL 60950-1 (2nd Edition). Production tested for 1 second at 3000 VRMS in accordance with IEC/UL 60950-1 (2nd Edition). 4800 VRMS 1550 VPK 1097 VRMS or VDC Working Voltage for Basic Isolation VWVBI Maximum approved working voltage for basic (single) isolation according IEC/UL 60950-1 (2nd Edition). Working Voltage for Reinforced Isolation VWVRI Maximum approved working voltage for reinforced isolation according to IEC/UL 60950-1 (2nd Edition) 800 VPK 565 VRMS or VDC Dcl Minimum distance through air from IP leads to signal leads. 7.5 mm Dcr Minimum distance along package body from IP leads to signal leads. 8.2 mm Clearance Creepage* *In order to maintain this creepage in applications, the user should add a slit in the PCB under the package. Otherwise, the pads on the PCB will reduce the creepage. Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 2 High Isolation Linear Current Sensor IC with 850 µΩ Current Conductor ACS717 VCC VCC Master Current Supply To all subcircuits CBYP IP+ Power-on Reset Hall Current Drive Sensitivity Temperature Coefficient Trim IP+ Dynamic Offset Cancellation IP+ IP+ IP− VIOUT Signal Recovery CL Sensitivity Trim IP− IP− 0 Ampere Offset Adjust IP− GND Functional Block Diagram Terminal List Table IP+ 1 16 NC IP+ 2 15 GND Number Name IP+ 3 14 NC IP+ 4 13 NC 1, 2, 3, 4 IP+ Terminals for current being sensed; fused internally IP– 5 12 VIOUT 5, 6, 7, 8 IP– Terminals for current being sensed; fused internally IP– 6 11 NC IP– 7 10 VCC 9, 16 NC No internal connection; recommended to be left unconnected in order to maintain high creepage. IP– 8 9 NC 11, 13. 14 NC No internal connection; recommended to connect to GND for the best ESD performance 10 VCC 12 VIOUT 15 GND Package MA, 16-Pin SOICW Description Device power supply terminal Analog output signal Signal ground terminal Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 3 ACS717 High Isolation Linear Current Sensor IC with 850 µΩ Current Conductor COMMON ELECTRICAL CHARACTERISTICS1: TA Range K, valid at TA = – 40°C to 125°C, VCC = 3.3 V, unless otherwise specified Characteristic Symbol Test Conditions Supply Voltage VCC Supply Current ICC VCC(min) < VCC < VCC(max), output open Min. Typ. Max. 3 3.3 3.6 Units V – 6 7.5 mA Output Capacitance Load CL VIOUT to GND – – 1 nF Output Resistive Load RL VIOUT to GND 15 – – kΩ Primary Conductor Resistance RP TA = 25°C – 0.85 – mΩ IP = IP(max), TA = 25°C, CL = open – 10 – μs – 4.5 – G/A IP = IP(max), TA = 25°C, CL = open – 5 – μs Rise Time tr Magnetic Coupling Factor CF Propagation Delay tpd Response Time tRESPONSE IP = IP(max), TA = 25°C, CL = open – 13 – μs Internal Bandwidth BWi Small signal –3 dB – 40 – kHz Noise Density IND Input referenced noise density; TA = 25°C, CL = 1 nF – 400 – µA(rms)/ √Hz Noise IN Input referenced noise; BWi = 40 kHz, TA = 25°C, CL = 1 nF – 80 – mA(rms) ELIN Across full range of IP – ±1 – % VOH RL = RL(min) VCC – 0.3 – – V VOL RL = RL(min) – – 0.3 V tPO Output reaches 90% of steady-state level, TA = 25°C, IP = IP(max) – 35 – μs Nonlinearity Saturation Voltage2 Power-On Time 1Device may be operated at higher primary current levels, IP , ambient temperatures, TA , and internal leadframe temperatures, provided the Maximum Junction Temperature, TJ(max), is not exceeded. 2The sensor IC will continue to respond to current beyond the range of I until the high or low saturation voltage; however, the nonlinearity in this region will be worse than P through the rest of the measurement range. Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 4 High Isolation Linear Current Sensor IC with 850 µΩ Current Conductor ACS717 xKMATR-10B PERFORMANCE CHARACTERISTICS: valid at TA = – 40°C to 125°C, VCC = 3.3 V, unless otherwise speci- fied Characteristic Symbol Test Conditions Min. Typ.1 Max. Units Nominal Performance Current Sensing Range IPR Sensitivity Sens Zero Current Output Voltage VIOUT(Q) –10 – 10 A IPR (min) < IP < IPR (max) – 132 – mV/A Bidirectional; IP = 0 A – VCC x 0.5 – V IP = IPR(max); TA = 25°C -5 -1 ±2 5 IP = IPR(max); TA = 85°C – -2 ±2 – IP =IPR(max); TA = 125°C – -1 ±3 – IP = IPR(max); TA = -40°C – 1 ±3 – TA = 25°C; measured at IP = IPR(max) -4 -1 ±2 4 Accuracy Performance Total Output Error2 Total Output Error ETOT Components3 Sensitivity Error Offset Voltage4 % ETOT = ESENS + 100 × VOE/(Sens x IP) ESENS VOE TA = 85°C; measured at IP = IPR(max) – -1.5±2 – TA = 125°C; measured at IP = IPR(max) – -1 ±3 – TA = -40°C; measured at IP = IPR(max) – 1 ±3 – % TA = 25°C; IP = 0 A; -40 ±10 40 TA = 85°C; IP = 0 A; – ±15 – TA = 125°C; IP = 0 A; – -5 ±20 – TA = -40°C; IP = 0 A – 10 ±20 – – ±2 – % – ±2 – % mV Lifetime Drift Characteristics Sensitivity Error Lifetime Drift Total Output Error Lifetime Drift ESENS_ DRIFT ETOT_DRIFT 1 Typical values with ± are 3 sigma values. 2 Percentage of I , with I = I P P PR (max) . 3 A single part will not have both the maximum/minimum sensitivity error and maximum/minimum offset voltage, as that would violate the maximum/minimum total output error specification. Also, 3 sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section. 4 Offset Voltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields. Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 5 High Isolation Linear Current Sensor IC with 850 µΩ Current Conductor ACS717 xKMATR-20B PERFORMANCE CHARACTERISTICS: valid at TA = – 40°C to 125°C, VCC = 3.3 V, unless otherwise speci- fied Characteristic Symbol Test Conditions Min. Typ.1 Max. Units Nominal Performance Current Sensing Range IPR Sensitivity Sens Zero Current Output Voltage VIOUT(Q) -20 - 20 A IPR (min) < IP < IPR (max) - 66 - mV/A Bidirectional; IP = 0 A - Vcc x 0.5 - V Accuracy Performance Total Output Error2 Total Output Error ETOT Components3 Sensitivity Error IP = IPR(max); TA = 25°C -5 ±2 5 IP = IPR(max); TA = 85°C - ±2 - IP =IPR(max); TA = 125°C - ±2 - IP = IPR(max); TA = -40°C - 2 ±2 - TA = 25°C; measured at IP = IPR(max) -4 ±2 4 TA = 85°C; measured at IP = IPR(max) - ±2 - TA = 125°C; measured at IP = IPR(max) - ±2 - ETOT = ESENS + 100 × VOE/(Sens x IP) ESENS TA = -40°C; measured at IP = IPR(max) Offset Voltage4 % VOE % - 1.5 ±2 - TA = 25°C; IP = 0 A; -40 ±5 40 TA = 85°C; IP = 0 A; - ±10 - TA = 125°C; IP = 0 A; - -5 ±15 - TA = -40°C; IP = 0 A - 5 ±10 - – ±2 – % – ±2 – % mV Lifetime Drift Characteristics Sensitivity Error Lifetime Drift Total Output Error Lifetime Drift ESENS_ DRIFT ETOT_DRIFT 1 Typical values with ± are 3 sigma values. 2 Percentage of I , with I = I P P PR (max) . 3 A single part will not have both the maximum/minimum sensitivity error and maximum/minimum offset voltage, as that would violate the maximum/minimum total output error specification. Also, 3 sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section. 4 Offset Voltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields. Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 6 High Isolation Linear Current Sensor IC with 850 µΩ Current Conductor ACS717 CHARACTERISTIC PERFORMANCE xKMATR-10B Key Parameters Offset Voltage vs. Temperature 1680 30 1670 20 Offset Voltage (mV) VIOUT(Q) (mV) Zero Current Output Voltage vs. Temperature 1660 1650 1640 0 -10 -20 1630 1620 -50 10 -30 -25 0 25 50 75 100 125 -50 -25 0 Temperature (ºC) 135 3.00 134 2.00 Sensitivity Error (%) Sensitivity (mV/A) 4.00 133 132 131 130 129 128 127 100 125 100 125 100 125 1.00 0.00 -1.00 -2.00 -3.00 -4.00 126 -5.00 -25 0 25 50 75 100 125 -50 -25 0 Temperature (ºC) 25 50 75 Temperature (ºC) Total Error at IPR(max) vs. Temperature Nonlinearity vs. Temperature 4.00 1.50 3.00 1.00 2.00 0.50 Total Error (%) Nonlinearity (%) 75 Sensitivity Error vs. Temperature Sensitivity vs. Temperature 0.00 -0.50 1.00 0.00 -1.00 -2.00 -3.00 -1.00 -4.00 -5.00 -1.50 -50 50 Temperature (ºC) 136 -50 25 -25 0 25 50 75 100 125 -50 Temperature (ºC) -25 0 25 50 75 Temperature (ºC) +3 Sigma Average -3 Sigma Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 7 High Isolation Linear Current Sensor IC with 850 µΩ Current Conductor ACS717 xKMATR-20B Key Parameters Offset Voltage vs. Temperature 1670 20 1665 15 1660 10 Offset Voltage (mV) VIOUT(Q) (mV) Zero Current Output Voltage vs. Temperature 1655 1650 1645 1640 1635 0 -5 -10 -15 -20 1630 -50 5 -25 0 25 50 75 100 125 -50 -25 0 Temperature (ºC) 100 125 100 125 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 8 75 Sensitivity Error vs. Temperature Sensitivity vs. Temperature 4.00 68.0 3.00 67.5 Sensitivity Error (%) Sensitivity (mV/A) 125 50 Temperature (ºC) 68.5 67.0 66.5 66.0 65.5 65.0 2.00 1.00 0.00 -1.00 -2.00 64.5 -3.00 -50 -25 0 25 50 75 100 125 -50 -25 0 Temperature (ºC) 50 75 Total Error at IPR(max) vs. Temperature 5.00 0.60 4.00 0.40 3.00 Total Error (%) 0.80 0.20 0.00 -0.20 2.00 1.00 0.00 -0.40 -1.00 -0.60 -2.00 -3.00 -0.80 -50 25 Temperature (ºC) Nonlinearity vs. Temperature Nonlinearity (%) 100 25 -25 0 25 50 75 100 125 -50 Temperature (ºC) -25 0 25 50 75 Temperature (ºC) +3 Sigma Average -3 Sigma High Isolation Linear Current Sensor IC with 850 µΩ Current Conductor ACS717 DEFINITIONS OF ACCURACY CHARACTERISTICS Sensitivity (Sens). The change in sensor IC output in response to a 1 A change through the primary conductor. The sensitivity is the product of the magnetic circuit sensitivity (G / A) (1 G = 0.1 mT) and the linear IC amplifier gain (mV/G). The linear IC amplifier gain is programmed at the factory to optimize the sensitivity (mV/A) for the full-scale current of the device. Increasing VIOUT (V) { [ ELIN = 1– VIOUT (IPR(max)) – VIOUT(Q) 2 × VIOUT (IPR(max)/2) – VIOUT(Q) [{ × 100 (%) Accuracy at 25°C Only IPR(min) –IP (A) Full Scale IP Accuracy at 25°C Only Decreasing VIOUT (V) Accuracy Across Temperature Figure 1: Output Voltage versus Sensed Current +ETOT Total Output Error (ETOT). The the difference between the current measurement from the sensor IC and the actual current (IP), relative to the actual current. This is equivalent to the difference between the ideal output voltage and the actual output voltage, divided by the ideal sensitivity, relative to the current flowing through the primary conduction path: VIOUT_ideal(IP) – VIOUT(IP) Sensideal(IP) × IP × 100 (%) The Total Output Error incorporates all sources of error and is a function of IP . At relatively high currents, ETOT will be mostly due to sensitivity error, and at relatively low currents, ETOT will be mostly due to Offset Voltage (VOE ). In fact, at IP = 0, ETOT approaches infinity due to the offset. This is illustrated in figures 1 and 2. Figure 1 shows a distribution of output voltages versus IP at 25°C and across temperature. Figure 2 shows the corresponding ETOT versus IP . IPR(max) 0A Offset Voltage (VOE). The deviation of the device output from its ideal quiescent value of 0.5 × VCC (bidirectional) or 0.1 × VCC (unidirectional) due to nonmagnetic causes. To convert this voltage to amperes, divide by the device sensitivity, Sens. ETOT(IP) = +IP (A) VIOUT(Q) where VIOUT(IPR(max)) is the output of the sensor IC with the maximum measurement current flowing through it and VIOUT(IPR(max)/2) is the output of the sensor IC with half of the maximum measurement current flowing through it. Zero Current Output Voltage (VIOUT(Q)). The output of the sensor when the primary current is zero. For a unipolar supply voltage, it nominally remains at at 0.5 × VCC for a bidirectional device and 0.1 × VCC for a unidirectional device. For example, in the case of a bidirectional output device, VCC = 3.3 V translates into VIOUT(Q) = 1.65 V. Variation in VIOUT(Q) can be attributed to the resolution of the Allegro linear IC quiescent voltage trim and thermal drift. Accuracy at 25°C Only Ideal VIOUT Accuracy Across Temperature Nonlinearity (ELIN). The nonlinearity is a measure of how linear the output of the sensor IC is over the full current measurement range. The nonlinearity is calculated as: Accuracy Across Temperature Across Temperature 25°C Only –IP +IP –ETOT Figure 2: Total Output Error versus Sensed Current Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 9 High Isolation Linear Current Sensor IC with 850 µΩ Current Conductor ACS717 APPLICATION INFORMATION The ACS717 works by sensing the magnetic field created by the current flowing through the package. However, the sensor cannot differentiate between fields created by the current flow and external magnetic fields. This means that external magnetic fields can cause errors in the output of the sensor. Magnetic fields which are perpendicular to the surface of the package affect the output of the sensor, as it only senses fields in that one plane. The error in Amperes can be quantified as: B Error(B) = CF where B is the strength of the external field perpendicular to the surface of the package in Gauss, and CF is the coupling factor in G/A. Then, multiplying by the sensitivity of the part (Sens) gives the error in mV. For example, an external field of 1 Gauss will result in around 0.22 A of error. If the ACS717KMATR-10B, which has a nominal sensitivity of 132 mV/A, is being used, that equates to 30 mV of error on the output of the sensor. Table 1: External Magnetic Field (Gauss) Impact External Field (Gauss) 0.5 Error (A) 0.11 Error (mV) 10B 15 20B 7 1 0.22 30 15 2 0.44 60 30 Estimating Total Error vs. Sensed Current The Performance Characteristics tables give distribution (±3 sigma) values for Total Error at IPR(max); however, one often wants to know what error to expect at a particular current. This can be estimated by using the distribution data for the components of Total Error, Sensitivity Error, and Offset Voltage. The ±3 sigma value for Total Error (ETOT) as a function of the sensed current (IP) is estimated as: 2 ETOT(IP) = ESENS + ( 2 ) 100 × VOE Sens × IP Here, ESENS and VOE are the ±3 sigma values for those error terms. If there is an average sensitivity error or average offset voltage, then the average Total Error is estimated as: ETOTAVG (IP) = ESENSAVG + 100 × VOEAVG Sens × IP The resulting total error will be a sum of ETOT and ETOT_AVG. Using these equations and the 3 sigma distributions for Sensitivity Error and Offset Voltage, the Total Error vs. sensed current (IP) is below for the ACS717KMATR-20B. As expected, as one goes towards zero current, the error in percent goes towards infinity due to division by zero (refer to Figure 3). 12 Total Error (% of current measured) Impact of External Magnetic Fields 10 8 6 4 -40C+3sig 2 -40C-3sig 0 25C+3sig 25C-3sig -2 125C+3sig -4 125C-3sig -6 -8 -10 0 2 4 6 8 10 12 14 16 18 20 Current (A) Figure 3: Predicted Total Error as a Function of Sensed Current for the ACS717KMATR-20B Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 10 High Isolation Linear Current Sensor IC with 850 µΩ Current Conductor ACS717 DEFINITIONS OF DYNAMIC RESPONSE CHARACTERISTICS Power-On Time (tPO) When the supply is ramped to its operating voltage, the device requires a finite time to power its internal components before responding to an input magnetic field. V VCC VCC(typ.) VIOUT 90% VIOUT Power-On Time (tPO) is defined as the time it takes for the output voltage to settle within ±10% of its steady state value under an applied magnetic field, after the power supply has reached its minimum specified operating voltage, VCC(min), as shown in the chart at right. VCC(min.) t1 t2 tPO Rise Time (tr) t1= time at which power supply reaches minimum specified operating voltage The time interval between a) when the sensor IC reaches 10% of its full scale value, and b) when it reaches 90% of its full scale value. t2= time at which output voltage settles within ±10% of its steady state value under an applied magnetic field 0 Propagation Delay (tpd ) The propagation delay is measured as the time interval a) when the primary current signal reaches 20% of its final value, and b) when the device reaches 20% of its output corresponding to the applied current. Response Time (tRESPONSE) The time interval between a) when the primary current signal reaches 90% of its final value, and b) when the device reaches 90% of its output corresponding to the applied current. t Figure 4: Power-On Time (%) 90 Primary Current VIOUT Rise Time, tr 20 10 0 Propagation Delay, tpd t Figure 5: Rise Time and Propagation Delay (%) 90 Primary Current VIOUT Response Time, tRESPONSE 0 t Figure 6: Response Time Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 11 High Isolation Linear Current Sensor IC with 850 µΩ Current Conductor ACS717 HIGH ISOLATION PCB LAYOUT NOT TO SCALE All dimensions in millimeters. 15.75 9.54 0.65 1.27 Package Outline Slot in PCB to maintain >8 mm creepage once part is on PCB 2.25 7.25 1.27 3.56 17.27 Current Out Current In 21.51 Perimeter holes for stitching to the other, matching current trace design, layers of the PCB for enhanced thermal capability. Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 12 High Isolation Linear Current Sensor IC with 850 µΩ Current Conductor ACS717 PACKAGE OUTLINE DRAWING For Reference Only – Not for Tooling Use (Reference MS-013AA) NOT TO SCALE Dimensions in millimeters Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown 8° 0° 10.30 ±0.20 16 0.33 0.20 7.50 ±0.10 10.30 ±0.33 A 1 1.27 1.40 REF 0.40 2 Branded Face 0.25 BSC SEATING PLANE 16X C 2.65 MAX 0.10 C GAUGE PLANE SEATING PLANE 0.30 0.10 1.27 BSC 0.51 0.31 0.65 1.27 16 NNNNNNNNNNNN YYWW LLLLLLLLLLLL 2.25 1 9.50 1 C 2 PCB Layout Reference View B Standard Branding Reference View N = Device part number = Supplier emblem Y = Last two digits of year of manufacture W = Week of manufacture L = Lot number A Terminal #1 mark area B Branding scale and appearance at supplier discretion C Reference land pattern layout (reference IPC7351 SOIC127P600X175-8M); all pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary to meet application process requirements and PCB layout tolerances Figure 7: Package MA, 16-Pin SOICW Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 13 High Isolation Linear Current Sensor IC with 850 µΩ Current Conductor ACS717 Revision History Revision Revision Date – December 15, 2014 Description of Revision Initial Release Copyright ©2011-2014, Allegro MicroSystems, LLC Allegro MicroSystems, LLC 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’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, LLC assumes no responsibility for its use; nor for any infringement of patents or other rights of third parties which may result from its use. For the latest version of this document, visit our website: www.allegromicro.com Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 14