ACS712 Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor Features and Benefits Description Low-noise analog signal path The Allegro ACS712 provides economical and precise Device bandwidth is set via the new FILTER pin solutions for AC or DC current sensing in industrial, automotive, 5 s output rise time in response to step input current commercial, and communications systems. The device 50 kHz bandwidth package allows for easy implementation by the customer. Total output error 1.5% at T = 25C, and 4% at 40C to 85C A Typical applications include motor control, load detection and Small footprint, low-profile SOIC8 package management, switched-mode power supplies, and overcurrent 1.2 m internal conductor resistance fault protection. 2.1 kV minimum isolation voltage from pins 1-4 to pins 5-8 RMS 5.0 V, single supply operation The device consists of a precise, low-offset, linear Hall 66 to 185 mV/A output sensitivity sensor circuit with a copper conduction path located near the Output voltage proportional to AC or DC currents surface of the die. Applied current flowing through this copper Factory-trimmed for accuracy conduction path generates a magnetic field which is sensed Extremely stable output offset voltage by the integrated Hall IC and converted into a proportional Nearly zero magnetic hysteresis Ratiometric output from supply voltage voltage. Device accuracy is optimized through the close proximity of the magnetic signal to the Hall transducer. A precise, proportional voltage is provided by the low-offset, chopper-stabilized BiCMOS Hall IC, which is programmed Package: 8 pin SOIC (suffix LC) for accuracy after packaging. The output of the device has a positive slope (>V ) IOUT(Q) when an increasing current flows through the primary copper conduction path (from pins 1 and 2, to pins 3 and 4), which is the path used for current sensing. The internal resistance of this conductive path is 1.2 m typical, providing low power Continued on the next page Approximate Scale 1:1 Typical Application +5 V 8 1 VCC IP+ V 7 OUT 2 C VIOUT IP+ BYP 0.1 F I ACS712 P 6 3 FILTER IP C F 4 IP 5 1 nF GND Application 1. The ACS712 outputs an analog signal, V . OUT that varies linearly with the uni- or bi-directional AC or DC primary sensed current, I , within the range specified. C P F is recommended for noise management, with values that depend on the application. ACS712-DS, Rev.1Fully Integrated, Hall Effect-Based Linear Current Sensor with ACS712 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor Description (continued) The ACS712 is provided in a small, surface mount SOIC8 package. loss. The thickness of the copper conductor allows survival of The leadframe is plated with 100% matte tin, which is compatible the device at up to 5 overcurrent conditions. The terminals of with standard lead (Pb) free printed circuit board assembly processes. the conductive path are electrically isolated from the sensor leads (pins 5 through 8). This allows the ACS712 current sensor to be Internally, the device is Pb-free, except for flip-chip high-temperature used in applications requiring electrical isolation without the use Pb-based solder balls, currently exempt from RoHS. The device is of opto-isolators or other costly isolation techniques. fully calibrated prior to shipment from the factory. Selection Guide T Optimized Range, I Sensitivity, Sens OP P Part Number Packing* (C) (A) (Typ) (mV/A) ACS712ELCTR-05B-T Tape and reel, 3000 pieces/reel 40 to 85 5 185 ACS712ELCTR-20A-T Tape and reel, 3000 pieces/reel 40 to 85 20 100 ACS712ELCTR-30A-T Tape and reel, 3000 pieces/reel 40 to 85 30 66 *Contact Allegro for additional packing options. Absolute Maximum Ratings Characteristic Symbol Notes Rating Units Supply Voltage V 8V CC Reverse Supply Voltage V 0.1 V RCC Output Voltage V 8V IOUT Reverse Output Voltage V 0.1 V RIOUT Output Current Source I 3mA IOUT(Source) Output Current Sink I 10 mA IOUT(Sink) 100 total pulses, 250 ms duration each, applied Overcurrent Transient Tolerance I 60 A P at a rate of 1 pulse every 100 seconds. Maximum Transient Sensed Current I (max) Junction Temperature, T < T (max) 60 A R J J Nominal Operating Ambient Temperature T Range E 40 to 85 C A Maximum Junction T (max) 165 C J Storage Temperature T 65 to 170 C stg Parameter Specification TV America CAN/CSA-C22.2 No. 60950-1-03 Certificate Number: Fire and Electric Shock UL 60950-1:2003 U8V 06 05 54214 010 EN 60950-1:2001 Allegro MicroSystems, Inc. 2 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com