Part Number: ACS712ELCTR-20B-T

Manufacturer: Allegro MicroSystems

Description: Board Mount Current Sensors For New Designs Use ACS723LLCTR-20AB-T

Shipped from: Shenzhen/HK Warehouse

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Hall Effect sensors are a sort of transducer that can transform magnetic information into electrical signals that electronic circuitry may further process. The Hall Effect is commonly used by current sensors to transform their current inputs into voltage outputs.  The Hall Effect is characterized by the passage of electrons carried by an electric current across a magnetic field plate. After that, the field “pushes” electrons to one side of the plate, causing a voltage differential. The sensor output is expressed as the voltage difference between the plate’s two sides.

The ACS712ELCTR-20B-T is a current sensor capable of functioning on either AC or DC power sources. This sensor requires 5V to function and generates an analog voltage output proportionate to the current being measured. This apparatus is made up of some Hall sensors that have copper cables running between them.

When a greater amount of current goes down the copper primary conduction path, this instrument’s output has a more positive slope (from pins 1 and 2 to pins 3 and 4). The resistance of the conductor’s route across the circuit is 1.2 milliohms.

At an input current of 0A and with a power supply of 5V Vcc, this sensor has an output voltage equal to Vcc multiplied by 0.5, which is 2.5. There are three varieties based on the current readable range, 5A, 20A, and 30A, and the output sensitivity of each type is 185mV / A, 100mV / A, and 66mV / A, respectively. The range of the readable current is specified in amperes.

Because the output of this current sensor is analog, we can read it in one of two ways: directly by measuring the output voltage with a voltmeter or indirectly by using a microcontroller like Arduino and connecting it to the Analog Read pin or the ADC pin.

ACS712ELCTR-20B-T Description

The Allegro ACS712ELCTR-20B-T offers both precise and cost-effective solutions for sensing AC or DC current in industrial, commercial, and communications applications. The apparatus is made up of a linear Hall sensor circuit that is exact and has a low offset, and it has a copper conduction path that is situated close to the surface of the die.

A magnetic field is produced when an external current is passed over this copper conduction line. The integrated Hall IC detects this magnetic field, which is then transformed into a voltage proportionate to the area. The magnetic signal must be close to the Hall transducer to achieve the highest possible level of precision from the device. The low-offset, which is programmed for accuracy after packaging, supplies an accurate and proportionate voltage.

ACS712ELCTR-20B-T Features and Benefits

  • The low-noise analog signal path
  • The device’s bandwidth is adjusted by changing the output rise time of the new filter pin 5 in response to changes in the step input current 80 kHz bandwidth.
  • At TA = 25°C, the total output error was 1.5%.
  • Low profile with a limited footprint SOIC8 package
  • 2 mohm of resistance on the internal conductor
  • sensitivity to output voltage ranging from 66 to 185 mV/A
  • The output voltage is proportional to the alternating current or direct current.
  • precision cut at the factory to ensure the correctness
  • The high degree of consistency in the output offset voltage
  • Magnetic hysteresis that is extremely close to zero
  • output proportional to an input voltage, measured in ratios

ACS712ELCTR-20B-T Application

  • Motor Control
  • Overcurrent Fault Protection
  • Load Detection and Management
  • Switch Mode Power Supplies

Product Technical Specifications

EU RoHS Compliant with Exemption
Part Status Active
HTS 8542.39.00.01
Automotive No
Type Open Loop
Module/IC Classification IC
Sensing Current Type AC|DC
Typical RMS Primary Current (A) ±20
Accuracy (%) ±1.5
Typical Response Time (us) 3.5
Maximum Output Voltage (V) 8
Minimum Operating Supply Voltage (V) 4.5
Typical Operating Supply Voltage (V) 5
Maximum Operating Supply Voltage (V) 5.5
Sensitivity (mV/A) 100
Minimum Operating Temperature (°C) -40
Maximum Operating Temperature (°C) 85
Packaging Tape and Reel
Mounting Surface Mount
Package Height 1.5(Max)
Package Width 3.9
Package Length 4.9
PCB changed 8
Standard Package Name SOP
Supplier Package SOIC N
Pin Count 8
Lead Shape Gull-wing

Frequently Asked Questions

What is the ACS712 Current sensor?

Hall effect-based linear current sensing is the specialty of the ACS712 device. This sensor is capable of measuring both alternating current (AC) and direct current (DC) (Alternating Current). It has a voltage isolation of 2.1kVRMS and an integrated current conductor with low resistance.

How does the ACS712 Current sensor work?

Depending on the circumstances, this sensor’s mode of operation can be described as direct or indirect. It uses indirect sensing to measure current with the ACS712 sensor. When current flows over a wire, the direct sensing method uses Ohm’s law to measure the voltage drop that occurs across the wire. In indirect sensing, either Faraday’s law or the Ampere law is applied to calculate the magnetic field to measure the current. This technique uses a transformer, a Hall effect sensor, or a fiber optic current sensor to sense the magnetic field.

This integrated circuit uses a Hall sensor with a low offset to measure the current. This sensor can be found on the integrated circuit’s exterior and connected to a copper conductor channel. Inside the sensor, a copper strip connects its IP+ and IP- pins. The Hall Effect sensor can detect the presence of a magnetic field because of the amount of current flowing through the copper conductor at any moment. The current is measured by using the voltage generated by the hall effect sensor, which is proportional to the magnetic field being sensed.


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