Product Overview
The Allegro ACS781xLR is a fully integrated, automotive-grade linear Hall-effect-based current sensor IC designed for high-precision AC and DC current sensing up to 100 A. It features a core-less, low-profile package with a very small footprint, ideal for space-constrained applications. The sensor utilizes Hall sensor technology with common-mode field rejection for optimal performance in the presence of interfering magnetic fields. It offers ultra-low power loss due to its 200 internal conductor resistance and provides an analog output voltage (VOUT) that varies linearly with the primary current (IP). The device is factory-trimmed for accuracy and compensated for temperature variations, ensuring stable performance across its operating temperature range. Its integrated shield technology provides high-level immunity to dV/dt and stray electric fields, making it suitable for high-side, high-voltage applications.
Product Attributes
- Brand: Allegro
- Package Type: 7-pin PSOF (suffix LR)
- Qualification: AEC-Q100 automotive
- Lead Finish: 100% matte tin
- Leadframe Material: Oxygen-free copper
- RoHS Compliant: Lead (Pb) free
Technical Specifications
| Characteristic | Model/Variant | Value | Unit | Notes |
|---|---|---|---|---|
| Sensed Current | ACS781LLRTR-050B-T | 50 | A | Bidirectional |
| ACS781LLRTR-050U-T | 0 to 50 | A | Unidirectional | |
| ACS781LLRTR-100B-T | 100 | A | Bidirectional | |
| ACS781LLRTR-100U-T | 0 to 100 | A | Unidirectional | |
| ACS781KLRTR-150B-T | 150 transient / 100 continuous | A | Bidirectional | |
| ACS781KLRTR-150U-T | 0 to 150 transient / 0 to 100 continuous | A | Unidirectional | |
| Sensitivity (Typ.) | ACS781LLRTR-050B-T | 26.4 | mV/A | Bidirectional |
| ACS781LLRTR-050U-T | 39.6 | mV/A | Unidirectional | |
| ACS781LLRTR-100B-T | 13.2 | mV/A | Bidirectional | |
| ACS781LLRTR-100U-T | 26.4 | mV/A | Unidirectional | |
| Sensitivity (Typ.) | ACS781KLRTR-150B-T | 8.8 | mV/A | Bidirectional |
| ACS781KLRTR-150U-T | 17.6 | mV/A | Unidirectional | |
| Internal Conductor Resistance | All | 200 | Typical | |
| Supply Voltage | All | 3 to 3.6 | V | Single supply operation |
| Typical Bandwidth | All | 120 | kHz | |
| Output Rise Time | All | 3.6 | s | In response to step input current |
| Operating Temperature Range (K) | All | -40 to 150 | C | |
| Operating Temperature Range (L) | All | -40 to 125 | C | |
| Continuous Current Rating | All | 100 | A | |
| Overcurrent Capability (IPOC) | TA = 25C, 1 s on time | 285 | A | |
| Package Thermal Resistance (RJA) | Mounted on Allegro evaluation board | 18 | C/W | |
| Forward Supply Voltage (VCC) | All | 6 | V | Absolute Maximum Rating |
| Primary Conductor Resistance (RPRIMARY) | TA = 25C | 200 | ||
| Quiescent Output Voltage (VOUT(QBI)) | IP = 0 A, TA = 25C | VCC/2 | V | Bidirectional variant |
| Quiescent Output Voltage (VOUT(QU)) | Unidirectional variant, IP = 0 A, TA = 25C | 0.1 VCC | V | |
| Total Output Error (ETOT(HT)) | TOP = 25C to 150C | 0.8 | % | Typical |
| Total Output Error (ETOT(LT)) | TOP = 40C to 25C | 1.5 | % | Typical |
2410010401_ALLEGRO-ACS781KLRTR-150B-T_C2654895.pdf
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