Allegro MicroSystems ACS71240 Current Sensor ICs

Allegro MicroSystems ACS71240 Galvanically Isolated Current Sensor ICs offer replacements for shunt resistors, operational amplifiers, current transformers, and voltage isolators in data center applications that require small form factor, monolithic sensor solutions. The ACS71240 fully integrated solutions reduce the overall cost of current sensing by eliminating discrete components that need printed circuit board area.

The Allegro ACS71240 monolithic Hall effect current sensor ICs feature output signal immunity to stray magnetic fields, improved output signal accuracy (<+/-1.5% typical), and output signal immunity to noisy supply voltage rails. The device also has a dedicated fast Overcurrent Fault output with a typical response time of 1.5us. This fast fault output provides a simple means of detecting short circuit events to prevent MOSFET or IGBT damage in an inverter, motor, or other switching power electronics applications.

Allegro Microsystems ACS71240 Current Sensor ICs are available in two very small form factor package options, each delivering different levels of galvanic isolation. The tiny 3mm x 3mm, wettable flank QFN package can be used on voltage rails up to 120V_DC and enables solder joint inspection required in zero PPM automotive applications. The standard footprint SOIC8 package is UL certified to 2400V_RMS of isolation and offers a working voltage of 420V_DC or 297V_RMS.

Features

AEC-Q100 qualified
Differential Hall sensing rejects common-mode stray magnetic fields
Overcurrent FAULT with a factory programmable trip range of 50% to 200% of full-scale current
Non-Ratiometric output provides immunity to noisy supplies
Galvanically Isolated:
- QFN package with 120V_DC working voltage
- SOIC8 package with UL certified to 2400V_RMS, working voltage of 420V_DC or 297V_RMS
Reduced Power Loss:
- 0.6mΩ internal conductor resistance on QFN package
- 1.2mΩ internal conductor resistance on SOIC8 package

Integrated shield virtually eliminates capacitive coupling from current conductor to die, greatly suppressing output noise due to high dv/dt transients
Output voltage proportional to AC or DC current
High-bandwidth 120kHz analog output for faster response times in control applications
Factory-trimmed sensitivity and quiescent output voltage for improved accuracy
3.3V and 5V single-supply operation
Small footprint, low-profile QFN, and SOIC8 packages suitable for space-constrained applications

Allegro MicroSystems ACS71240 Current Sensor ICs

Features

Typical Application

Block Diagram

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