Product Overview
The Allegro ACS781xLR is a fully integrated, automotive-grade linear Hall-effect-based current sensor IC designed for high-precision measurement of bidirectional AC and DC currents up to 100 A. It features a core-less, low-profile package with a small footprint, ideal for space-constrained applications. The device offers ultra-low power loss due to its 200 internal conductor resistance and incorporates common-mode field rejection for optimized performance in the presence of interfering magnetic fields. Its output voltage (VOUT) varies linearly with the primary current (IP), and it is factory-trimmed for accuracy, providing stable quiescent output voltage and excellent total output error across a wide operating temperature range. The integrated shield technology enhances immunity to dV/dt and stray electric fields, making it suitable for high-side, high-voltage applications.
Product Attributes
- Brand: Allegro MicroSystems
- Package Type: 7-pin PSOF (suffix LR)
- Certifications: AEC-Q100 automotive qualification
- Lead Finish: 100% matte tin
- Leadframe Material: Oxygen-free copper
- Material Composition: Lead (Pb) free
Technical Specifications
| Characteristic | Model/Variant | Value | Unit | Notes |
|---|---|---|---|---|
| Continuous Sensed Current | ACS781xLR (General) | 100 | A | Up to 100 A |
| Primary Conductor Resistance | ACS781xLR | 200 | Typical at 25C | |
| Primary Conductor Voltage Isolation | ACS781xLR | 100 | Vpeak | On primary conductor |
| Supply Voltage | ACS781xLR | 3 to 3.6 | V | Single supply operation |
| Typical Bandwidth | ACS781xLR | 120 | kHz | Small signal -3 dB |
| Output Rise Time | ACS781xLR | 3.6 | s | In response to step input current |
| Operating Temperature Range | Range K | -40 to 125 | C | Nominal |
| Operating Temperature Range | Range L | -40 to 150 | C | Nominal |
| Quiescent Output Voltage (Bidirectional) | ACS781xLR | VCC / 2 | - | IP = 0 A, TA = 25C |
| Quiescent Output Voltage (Unidirectional) | ACS781xLR | 0.1 VCC | - | IP = 0 A, TA = 25C |
| Overcurrent Capability (1s on time, 60s off time) | ACS781xLR | 285 | A | TA = 25C |
| Package Dimensions | 7-pin PSOF | 1.5 | mm | Thickness |
| Part Number | Sensed Current | Sensitivity (Typ.) | Operating Temp. | Packing |
| ACS781LLRTR-050B-T | Bidirectional 50 A | 26.4 mV/A | -40 to 150 C | Tape and reel |
| ACS781LLRTR-050U-T | Unidirectional 0 to 50 A | 39.6 mV/A | -40 to 150 C | Tape and reel |
| ACS781LLRTR-100B-T | Bidirectional 100 A | 13.2 mV/A | -40 to 150 C | Tape and reel |
| ACS781LLRTR-100U-T | Unidirectional 0 to 100 A | 26.4 mV/A | -40 to 150 C | Tape and reel |
| ACS781KLRTR-150B-T | Bidirectional 150 A (transient), 100 A (continuous) | 8.8 mV/A | -40 to 125 C | Tape and reel |
| ACS781KLRTR-150U-T | Unidirectional 0 to 150 A (transient), 0 to 100 A (continuous) | 17.6 mV/A | -40 to 125 C | Tape and reel |
2410010401_ALLEGRO-ACS781LLRTR-050B-T_C2688266.pdf
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