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. Key benefits include low power loss from its low primary conductor resistance, ultrafast response time for short-circuit detection, and an integrated fault comparator for overcurrent detection. Available in small, low-profile QFN-12 and SOIC-8 surface-mount packages, it is fully calibrated and AEC-Q100 automotive qualified.
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
| Model | Supply Voltage (VCC) | Optimized Accuracy Range (IPR) | Sensitivity (Typ) (mV/A) | Fault Trip Level (A) | Operating Ambient Temperature Range (TA) | Package | Primary Conductor Resistance (Typ) |
|---|---|---|---|---|---|---|---|
| ACS71240KEXBLT-010B3 | 3.3 | 10 A | 132 | 10 A | 40 to 125 C | 12-contact QFN (EXB) | 0.6 m |
| ACS71240KEXBLT-010B3-115 | 3.3 | 10 A | 132 | 11.5 A | 40 to 125 C | 12-contact QFN (EXB) | 0.6 m |
| ACS71240KEXBLT-030B3 | 3.3 | 30 A | 44 | 30 A | 40 to 125 C | 12-contact QFN (EXB) | 0.6 m |
| ACS71240KEXBLT-030B3-167L | 3.3 | 30 A | 44 | 50 A (latched) | 40 to 125 C | 12-contact QFN (EXB) | 0.6 m |
| ACS71240KEXBLT-030B5 | 5.0 | 30 A | 66 | 30 A | 40 to 125 C | 12-contact QFN (EXB) | 0.6 m |
| ACS71240KEXBLT-050U5 | 5.0 | 0 to 50 A (Unidirectional) | 80 | 50 A | 40 to 125 C | 12-contact QFN (EXB) | 0.6 m |
| ACS71240LLCBTR-010B3 | 3.3 | 10 A | 132 | 10 A | 40 to 150 C | 8-pin SOIC (LCB) | 1.2 m |
| ACS71240LLCBTR-030B3 | 3.3 | 30 A | 44 | 30 A | 40 to 150 C | 8-pin SOIC (LCB) | 1.2 m |
| ACS71240LLCBTR-045B5 | 5.0 | 45 A | 44.4 | 45 A | 40 to 150 C | 8-pin SOIC (LCB) | 1.2 m |
| ACS71240LLCBTR-050U5 | 5.0 | 0 to 50 A (Unidirectional) | 80 | 50 A | 40 to 150 C | 8-pin SOIC (LCB) | 1.2 m |
| General Electrical Characteristics | |||||||
| Supply Current (ICC) | 5 V variant (no load) | - | - | - | - | - | 10-12 mA |
| Supply Current (ICC) | 3.3 V variant (no load) | - | - | - | - | - | 7.5-12 mA |
| Bandwidth (BW) | - | - | - | - | - | - | 120 kHz |
| Response Time (tRESPONSE) | - | - | - | - | - | - | 4 s (typ) |
| Fault Response Time (tFAULT) | - | - | - | - | - | - | 1.5 s (typ) |
| Isolation Characteristics (SOIC-8 package) | |||||||
| Dielectric Surge Strength Test Voltage (VSURGE) | - | - | - | - | - | - | 6000 V |
| Dielectric Strength Test Voltage (VISO) | - | - | - | - | - | - | 2400 VRMS |
| Working Voltage for Basic Isolation (VWVBI) | - | - | - | - | - | - | 420 VPK or VDC / 297 VRMS |
| Isolation Characteristics (QFN-12 package) | |||||||
| Working Voltage for Basic Isolation (VWVBI) | - | - | - | - | - | - | 100 VPK or VDC |
| ESD Ratings | |||||||
| Human Body Model (VHBM) | SOIC-8 package | - | - | - | - | - | 6.5 kV |
| Human Body Model (VHBM) | QFN-12 package | - | - | - | - | - | 4.0 kV |
| Charged Device Model (VCDM) | - | - | - | - | - | - | 1 kV |
2410010100_ALLEGRO-ACS71240KEXBLT-010B3-115_C1497623.pdf
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