ACS712

Features:

▪ Low-noise analog signal path
▪ Device bandwidth is set via the new FILTER pin
▪ 5 s output rise time in response to step input current
▪ 50 kHz bandwidth
▪ Total output error 1.5% at TA = 25°C, and 4% at 40°C to 85°C
▪ Small footprint, low-profile SOIC8 package
▪ 1.2 m internal conductor resistance
▪ 2.1 kVRMS minimum isolation voltage from pins 1-4 to pins 5-8
▪ 5.0 V, single supply operation
▪ 66 to 185 mV/A output sensitivity
▪ Output voltage proportional to AC or DC currents
▪ Factory-trimmed for accuracy
▪ Extremely stable output offset voltage
▪ Nearly zero magnetic hysteresis
▪ Ratiometric output from supply voltage




Pinout






Specifications

Characteristic	Symbol	Notes	Rating	Units
Supply Voltage	VCC		8	V
Reverse Supply Voltage	VRCC		-0.1	V
Output Voltage	VIOUT		8	V
Reverse Output Voltage	VRIOUT		-0.1	V
Output Current Source	IIOUT(Source)		3	mA
Output Current Sink	IIOUT(Sink)		10	mA
Overcurrent Transient Tolerance	IP	100 total pulses, 250 ms duration each, applied at a rate of 1 pulse every 100 seconds.	60	A
Maximum Transient Sensed Current	IR(max)	Junction Temperature, TJ < TJ(max)	60	A
Nominal Operating Ambient Temperature	TA	Range E	40 to 85	ºC
Maximum Junction	TJ(max)		165	ºC
Storage Temperature	Tstg		65 to 170	ºC

Description

The Allegro® ACS712 provides economical and precise solutions for AC or DC current sensing in industrial, automotive, commercial, and communications systems. The device package allows for easy implementation by the customer. Typical applications include motor control, load detection and management, switched-mode power supplies, and overcurrent fault protection.

The device ACS712 consists of a precise, 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 signal to the Hall transducer. A precise, 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 ACS712 has a positive slope (>VIOUT(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 powerloss. The thickness of the copper conductor allows survival of
the device at up to 5* overcurrent conditions. The terminals of the conductive path are electrically isolated from the sensor leads (pins 5 through 8). This allows the ACS712 current sensor to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques.

The ACS712 is provided in a small, surface mount SOIC8 package. The leadframe is plated with 100% matte tin, which is compatible with standard lead (Pb) free printed circuit board assembly processes. Internally, the device is Pb-free, except for flip-chip high-temperature Pb‑based solder balls, currently exempt from RoHS. The device is fully calibrated prior to shipment from the factory.