Product Overview
The Allegro ACS71240 is an economical and precise automotive-grade current sensor IC designed for AC or DC current sensing in industrial, automotive, commercial, and communications applications. It features a low-offset linear Hall sensor with a near-surface copper conduction path, generating a voltage proportional to the applied current. The device offers high accuracy due to differential sensing that rejects common-mode magnetic fields and an integrated shield that suppresses output noise from high dv/dt transients. With an ultrafast response time and an integrated fault comparator for overcurrent detection, it provides robust protection against short-circuit events. Available in small, low-profile QFN-12 and SOIC-8 surface-mount packages, the ACS71240 is fully calibrated at the factory and compatible with lead-free assembly processes.
Product Attributes
- Brand: Allegro
- Certifications: AEC-Q100 automotive qualified, UL certified package (SOIC-8 only)
- Material: Leadframe plated with 100% matte tin; internally Pb-free (except for flip-chip high-temperature Pb-based solder balls)
Technical Specifications
| Feature | Specification | Package | Details |
|---|---|---|---|
| Product Name | ACS71240 | N/A | Automotive-Grade, Galvanically Isolated Current Sensor IC |
| Core Technology | Hall Sensor | N/A | Precise, low-offset linear Hall sensor with differential sensing |
| Current Sensing Type | AC or DC | N/A | Bidirectional and Unidirectional options available |
| Key Features | Common-Mode Field Rejection, Integrated Fault Comparator, Ultrafast Response Time, High Bandwidth, Patented Integrated Digital Temperature Compensation | N/A | Rejects external magnetic fields, simplified overcurrent detection, rapid short-circuit protection, 120 kHz analog output, near closed-loop accuracy over temperature |
| Package Options | QFN-12 | EXB (3 mm 3 mm 0.75 mm) | Wettable flank |
| Package Options | SOIC-8 | LCB | Internally fused path |
| Primary Conductor Resistance | 0.6 m (typ) | QFN-12 | Low power loss, high inrush current capability |
| Primary Conductor Resistance | 1.2 m (typ) | SOIC-8 | Low power loss, high inrush current capability |
| Supply Voltage | 3.3 V or 5.0 V | N/A | Single supply operation |
| Output Type | Non-ratiometric | N/A | Immunity to noisy supplies |
| Fault Output | Integrated Overcurrent FAULT | N/A | Available between 50% and 200% IPR with 1.5 s (typ) response time; latched and unlatched options |
| Bandwidth | 120 kHz | N/A | Industry-leading noise performance |
| Operating Temperature Range | 40C to 125C | QFN-12 | Automotive temperature range |
| Operating Temperature Range | 40C to 150C | SOIC-8 | Automotive temperature range |
| Maximum Continuous Current | 55 A | SOIC-8 package | TA = 25C |
| Maximum Continuous Current | 60 A | QFN-12 package | TA = 25C |
| Isolation Characteristics (SOIC-8) | Dielectric Surge Strength Test Voltage | SOIC-8 | 6000 V (per IEC 61000-4-5) |
| Isolation Characteristics (SOIC-8) | Dielectric Strength Test Voltage | SOIC-8 | 2400 VRMS (Agency type-tested) |
| ESD Ratings (SOIC-8) | Human Body Model (VHBM) | SOIC-8 | 6.5 kV (Per AEC-Q100) |
| ESD Ratings (QFN-12) | Human Body Model (VHBM) | QFN-12 | 4.0 kV (Per AEC-Q100) |
| Model Example | ACS71240KEXBLT-010B3 | QFN-12 | 3.3 V, 10 A, 132 mV/A, 10 A Fault Trip |
| Model Example | ACS71240LLCBTR-030B3 | SOIC-8 | 3.3 V, 30 A, 44 mV/A, 30 A Fault Trip |
| Model Example | ACS71240KEXBLT-050U5 | QFN-12 | 5.0 V, 0-50 A (Unidirectional), 80 mV/A, 50 A Fault Trip |
| Model Example | ACS71240LLCBTR-045B5 | SOIC-8 | 5.0 V, 45 A, 44.4 mV/A, 45 A Fault Trip |
2106080105_ALLEGRO-ACS71240KEXBLT-030B3_C2654902.pdf
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