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Related Links:

Datasheets:
ACS704ELC-005: Current Sensor (PDF),

ACS704ELC-015: Current Sensor (PDF)

Selection Guides:
Hall-Effect Sensors,

Current Sensor Modules

when this product is updated

Technical Publications:
Managing External Magnetic Field Interference When Using ACS70x and ACS71x Current Sensors (PDF),

Using Allegro Current Sensors in Dual Power Supply Applications and Converting Sensed AC Currents into Peak Current Measurements (PDF),

Managing Noise Levels in the ACS704 Current Sensor (PDF),

Isolated Open Loop Current Sensing Using Hall Effect Technology in an Optimized Magnetic Circuit (PDF)

FAQs:
ACS704 Current Sensor Frequently Asked Questions

Press Releases:
ACS704: Allegro MicroSystems, Inc. Launches First SOIC8-Packaged Hall-Effect Current Sensor with Integrated Current Path

Product Evaluation Kits:
ASEK704ELC-005 Current Sensor Evaluation Kit,

ASEK704ELC-015 Current Sensor Evaluation Kit

ACS704
Fully Integrated, Hall Effect-Based Linear Current Sensor with Voltage Isolation and a Low-Resistance Current Conductor

These parts are in production but have been determined to be LAST TIME BUY. This classification indicates that the product is obsolete and notice has been given. Sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available. For new customers or new applications, please refer to ACS712.

Features and Benefits

• Small footprint, low-profile SOIC8 package
• 1.5 mΩ internal conductor resistance
• Excellent replacement for sense resistors
• 800 VRMS minimum isolation voltage beween pins 1-4 and 5-8
• 4.5 to 5.5 V, single supply operation
• 50 kHz bandwidth
• 133 mV/A output sensitivity and 15 A dynamic range
• Output voltage proportional to ac and dc currents
• Factory-trimmed for accuracy
• Extremely stable output offset voltage
• Near-zero magnetic hysteresis
• Ratiometric output from supply voltage

Description

The Allegro ACS704 family of current sensors provides economical and precise solutions for 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 consists of a precision, 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 at the factory.

The output of the device has a positive slope (>V_CC / 2) 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 typically 1.5 mΩ, providing low power loss. The thickness of the copper conductor allows survival of the device at up to 5x overcurrent conditions for the -005 and up to 3x for the -015. The terminals of the conductive path are electrically isolated from the sensor leads (pins 5 through 8). This allows the ACS704 family of sensors to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques.

The ACS704 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 flip-chip uses high temperature Pb-based solder balls, currently exempt from RoHS. The device is fully calibrated prior to shipment from the factory.

Functional Block Diagram

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
ACS704ELC-005	8-lead SOIC	Yes	view data	-40 °C to  85 °C	discontinued	Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor.
ACS704ELC-015	8-lead SOIC	Yes	view data	-40 °C to  85 °C	discontinued	Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor.

Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.