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Allegro ACS71240 Automotive Galvanically Isolated Current Sensor ICs offer next-generation improvements over the ACS711 Current Sensor ICs.

The ACS71240 features output signal immunity to stray magnetic fields (created by adjacent motors or current-carrying wires), improved output signal accuracy (±1.5% typical), and output signal immunity to noisy supply voltage rails. In addition, the device has a dedicated fast overcurrent fault output that has a typical response time of 1.5us. The fast fault output employs a simple means of detecting short circuit events to prevent MOSFET or IGBT damage in an inverter, motor, or other switching power electronics applications.
The ACS71240 Automotive Galvanically Isolated Current Sensor ICs are designed to replace shunt resistors, operational amplifiers, current transformers, and voltage isolators in applications that require a small form factor.
The ACS71240 is available in two minimal form factor package options, each providing different levels of galvanic isolation. The tiny 3mm x 3mm, wettable flank QFN package can be used on voltage rails up to 120VDC and enables solder joint inspection required in zero PPM automotive applications. The standard footprint SOIC8 package is UL certified to 2400VRMS of isolation and delivers a working voltage of 420VDC or 297VRMS.
The sensors support use on 5V or 3.3V power supplies.

Product Number: ACS71240KEXBLT / ACS71240LLCBTR / ACS71240KEXBLT-010B3

Class: Current Sensor,PowerManagentIC(PMIC)

Tag: Hall-based Current Sensor, Integrated Current Sensor

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: 120VDC working voltage
• SOIC8 package: UL certified to 2400VRMS, working voltage of 420VDC or 297VRMS
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

Brakes Audio Power Amplifier Actuator
Part Number Number of Channels Frequency Linearity Accuracy Response Time Sensitivity Current - Sensing Operating Temperature Current - Supply Package Type
ACS71240KEXBLT-010B3 Analog 120 kHz ±1% ±6% 4µs 132mV/A 10A -40 °C ~ 125 °C(TA) 3.3 V 12-lead QFN (3x3)
ACS71240KEXBLT-010B3-115 Analog 120 kHz ±1% ±6% 4µs 132mV/A 10A -40 °C ~ 125 °C(TA) 3.3 V 12-lead QFN (3x3)
ACS71240KEXBLT-030B3 Analog 120 kHz ±1% ±6% 4µs 44mV/A 30A -40 °C ~ 125 °C(TA) 3.3 V 12-lead QFN (3x3)
ACS71240KEXBLT-050U5 Analog 120 kHz ±1% ±6% 4µs 80mV/A 50A -40 °C ~ 125 °C(TA) 5V 12-lead QFN (3x3)
ACS71240LLCBTR-010B3 Analog 120 kHz ±1% ±6% 4µs 132mV/A 10A -40 °C ~ 150 °C(TA) 3.3V 8-lead SOIC
ACS71240LLCBTR-030B3 Analog 120 kHz ±1% ±6% 4µs 44mV/A 30A -40 °C ~ 150 °C(TA) 3.3V 8-lead SOIC
ACS71240LLCBTR-045B53 Analog 120 kHz ±1% ±6% 4µs 44.4mV/A 45A -40 °C ~ 150 °C(TA) 5V 8-lead SOIC
ACS71240LLCBTR-050U5 Analog 120 kHz ±1% ±6% 4µs 80mV/A 50A -40 °C ~ 150 °C(TA) 5V 8-lead SOIC
  • See below for downloadable documentation, software, and other resources.

    Datasheet Download on Sep, 2022

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