ALLEGRO ACS724LMCTR-30AB-T

Allegro™ ACS724/5LMC current sensor ICs are economical and precise solutions for AC or DC current sensing in industrial and communications systems. The small package suits space-constrained applications while reducing PCB area for cost savings. Typical applications include solar inverters, DC/DC converters, EV on-board chargers, motor control, load detection and management, switching power supplies, and overcurrent fault protection. The device consists of a precise, low-offset linear Hall sensor circuit and a copper conduction path located near the surface of the die. Current flowing through this copper conduction path generates a magnetic field that is sensed by the integrated Hall IC and converted into a proportional voltage. To suppress common-mode fields, current is sensed differentially, improving accuracy in magnetically noisy environments. Placing the magnetic field in close proximity to the Hall sensor optimizes the inherent accuracy of the device. The low-offset, chopper-stabilized BiCMOS Hall IC provides precise proportional voltage output, incorporating Allegro's patented digital temperature compensation for exceptional accuracy across temperature. The output of the device has a positive slope as the current through the primary copper conduction path (from pins 1–4 to pins 5–8, the path used for current sensing) increases. The typical internal resistance of this conduction path is 265 μΩ, enabling low power dissipation. The terminals of the conduction path are electrically isolated from the sensor pins (pins 9–16). This allows the ACS724/5LMC current sensor ICs to be used in high-side current sensing applications without the need for high-side differential amplifiers or other costly isolation techniques. The ACS724/5LMC comes in a custom SMT package similar to SOIC16. The pin pitch matches that of a standard SOIC16, but the lead frame thickness is 2.5× greater to reduce resistance. The package body is designed to achieve a creepage/clearance distance greater than 8.2 mm. The lead frame is plated with 100% matte tin, compatible with standard lead-free PCB assembly processes. The device is internally lead-free. Devices are fully calibrated prior to shipment.

• AEC-Q100 automotive-grade certified
• Differential Hall sensing rejects common-mode fields
• UL60950-1 (Edition 2) and UL 62368 (Edition 1) certified
• Dielectric strength voltage = 5 kV (RMS)
• Basic isolation working voltage = 1140 V (RMS) and 1600 V (DC)
• Reinforced isolation working voltage = 757 V (RMS) and 813 V (DC)
• Filter pin allows user to filter output at lower bandwidth for improved resolution (reduced noise)
• Primary conductor resistance of 265 μΩ for low power dissipation and high continuous current capability
• Custom SOIC16W-like package with lead thickness 2.5× standard, reduced resistance, slightly larger body, creepage/clearance > 8.2 mm
• 3.3 V or 5 V single-supply operation
• Output voltage proportional to AC or DC current
• Factory-trimmed sensitivity and quiescent output voltage for improved accuracy
• Chopper stabilization technology for extremely stable quiescent output voltage
• Near-zero hysteresis
• Output ratiometric to supply voltage

• Solar inverters
• DC/DC converters
• EV on-board chargers
• Motor control
• Switching power supplies