Product Overview
The Allegro ACS781xLR is a fully integrated, automotive-grade 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, offering ultra-low power loss due to its 200 internal conductor resistance. The device provides an analog output voltage (VOUT) that varies linearly with the primary current (IP). Enhanced by common-mode field rejection and Allegro's proprietary integrated shield technology, it delivers superior immunity to interfering magnetic fields and high dV/dt signals, ensuring stable performance in high-side, high-voltage applications. Factory-programmed sensitivity and quiescent output voltage, along with chopper-stabilized signal paths and digital temperature compensation, contribute to its exceptional accuracy and stability across a wide operating temperature range. Ideal for applications requiring precise current monitoring in automotive and industrial environments.
Product Attributes
- Brand: Allegro
- Package Type: 7-pin PSOF (suffix LR)
- Automotive Qualification: AEC-Q100
- Lead Free: Yes
- Material: Oxygen-free copper leadframe
Technical Specifications
| Characteristic | Model/Variant | Min. | Typ. | Max. | Unit | Notes |
|---|---|---|---|---|---|---|
| Continuous Sensed Current | ACS781xLR | 100 | A | Bidirectional | ||
| Internal Conductor Resistance | ACS781xLR | 200 | ||||
| Supply Voltage | ACS781xLR | 3 | 3.3 | 3.6 | V | Single supply operation |
| Bandwidth | ACS781xLR | 120 | kHz | Typical | ||
| Output Rise Time | ACS781xLR | 3.6 | s | In response to step input current | ||
| Operating Temperature Range | Range K | -40 | 150 | C | Nominal | |
| Operating Temperature Range | Range L | -40 | 125 | C | Nominal | |
| Primary Sampled Current | ACS781LLRTR-050B-T | -50 | 50 | A | Bidirectional | |
| Sensitivity (Typ.) | ACS781LLRTR-050B-T | 26.4 | mV/A | |||
| Primary Sampled Current | ACS781LLRTR-050U-T | 0 | 50 | A | Unidirectional | |
| Sensitivity (Typ.) | ACS781LLRTR-050U-T | 39.6 | mV/A | |||
| Primary Sampled Current | ACS781LLRTR-100B-T | -100 | 100 | A | Bidirectional | |
| Sensitivity (Typ.) | ACS781LLRTR-100B-T | 13.2 | mV/A | |||
| Primary Sampled Current | ACS781LLRTR-100U-T | 0 | 100 | A | Unidirectional | |
| Sensitivity (Typ.) | ACS781LLRTR-100U-T | 26.4 | mV/A | |||
| Primary Sampled Current | ACS781KLRTR-150B-T | 100 (continuous) | 150 (transient) | A | Bidirectional | |
| Sensitivity (Typ.) | ACS781KLRTR-150B-T | 8.8 | mV/A | |||
| Primary Sampled Current | ACS781KLRTR-150U-T | 0 to 100 (continuous) | 0 to 150 (transient) | A | Unidirectional | |
| Sensitivity (Typ.) | ACS781KLRTR-150U-T | 17.6 | mV/A | |||
| Overcurrent Rating (IPOC) | 285 | A | TA = 25C, 1 s on time, 60 s off time | |||
| Package Thermal Resistance (RJA) | 18 | C/W | Mounted on Allegro evaluation board | |||
| Maximum Junction Temperature (TJ(max)) | 165 | C | ||||
| Quiescent Output Voltage (VOUT(QBI)) | Bidirectional | VCC/2 | V | IP = 0 A, TA = 25C | ||
| Quiescent Output Voltage (VOUT(QU)) | Unidirectional | 0.1 VCC | V | IP = 0 A, TA = 25C |
2410010401_ALLEGRO-ACS781KLRTR-150U-T_C2654893.pdf
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