Features and Benefits;
Maximum current: 50A
Voltage：3.3-5V
temperature：-41°C ~ 152°C
Industry-leading noise performance through proprietary amplifier and filter design techniques
Integrated shield greatly reduces capacitive coupling from current conductor to die due to high dV/dt signals, and prevents offset drift in high-side, high voltage applications
Total output error improvement through gain and offset trim over temperature
Small package size, with easy mounting capability
Monolithic Hall IC for high reliability
Ultra-low-power loss: 100 μΩ internal conductor resistance
Galvanic isolation allows use in economical, high-side current sensing in high voltage systems
3.0 to 5.5 V, single-supply operation
120 kHz typical bandwidth
3 μs output rise time in response to step input current
Output voltage proportional to AC or DC currents
Factory-trimmed for accuracy
Extremely stable output offset voltage
Nearly zero magnetic hysteresis
Package Included:
1 x ACS758 50amp Current Sensor for Arduino

Tutorial
https://robojax.com/learn/arduino/?vid=robojax-allegro_ACS758{7e82c6d62784066d1b113f595afb6e15f0ca3fec289cddd29e600df910d44428}20_LCD1602_I2C_CP

The Allegro™ ACS758 family of current sensor ICs provides economical and precise solutions for AC or DC current sensing. Typical applications include motor control, load detection and management, power supply and DC-to-DC converter control, inverter control, and overcurrent fault detection.
The device consists of a precision, low-offset linear Hall circuit with a copper conduction path located near the die. Applied current flowing through this copper conduction path generates a magnetic field in which the Hall IC converts into a proportional voltage. Device accuracy is optimized through the close proximity of the magnetic signal to the Hall transducer. A precise, proportional output voltage is provided by the low-offset, chopper-stabilized BiCMOS Hall IC, which is programmed for accuracy at the factory.
High-level immunity to current conductor dV/dt and stray electric fields, offered by Allegro proprietary integrated shield technology, provides low output voltage ripple and low offset drift in high-side, high voltage applications.
The output of the device has a positive slope (>VCC / 2) when an increasing current flows through the primary copper conduction path (from terminal 4 to terminal 5), which is the path used for current sampling. The internal resistance of this conductive path is 100 μΩ typical, providing low power loss.
The thickness of the copper conductor allows the survival of the device at high overcurrent conditions. The terminals of the conductive path are electrically isolated from the signal leads (pins 1 through 3). This allows the ACS758 family of sensor ICs to be used in applications requiring electrical isolation without the use of optoisolators or other costly isolation techniques.
The device is fully calibrated prior to shipment from the factory. The ACS758 family is lead (Pb) free. All leads are plated with 100{7e82c6d62784066d1b113f595afb6e15f0ca3fec289cddd29e600df910d44428} matte tin, and there is no Pb inside the package. The heavy gauge lead frame is made of oxygen-free copper.