Product Overview
The Allegro ACS781xLR is a fully integrated, automotive-grade linear Hall-effect current sensor IC designed for accurate measurement of bidirectional AC and DC currents up to 100 A. Housed in a compact, low-profile (1.5 mm thick) core-less package, it offers a small footprint and ultra-low power loss due to its 200 internal conductor resistance. The device leverages Hall sensor technology with common-mode field rejection for optimal performance in the presence of interfering magnetic fields. It features a precision, low-offset linear Hall circuit with a factory-programmed sensitivity and quiescent output voltage. Advanced technologies like chopper-stabilized signal path and digital temperature compensation ensure stability across its operating temperature range. The integrated shield provides high-level immunity to current conductor dV/dt and stray electric fields, making it suitable for high-side, high-voltage applications. The output voltage (VOUT) varies linearly with the primary current (IP), with a positive slope for increasing current.
Product Attributes
- Brand: Allegro
- Package Type: 7-pin PSOF (Suffix LR)
- Certifications: AEC-Q100 automotive qualification
- Material: Lead (Pb) free, 100% matte tin plating, oxygen-free copper leadframe
- Core: Core-less package
Technical Specifications
| Model | Sensed Current (IP) | Sensitivity (Typ.) | Operating Temperature | Package |
|---|---|---|---|---|
| ACS781LLRTR-050B-T | Bidirectional 50 A | 26.4 mV/A | 40 to 150 C | 7-pin PSOF |
| ACS781LLRTR-050U-T | Unidirectional 0 to 50 A | 39.6 mV/A | 40 to 150 C | 7-pin PSOF |
| ACS781LLRTR-100B-T | Bidirectional 100 A | 13.2 mV/A | 40 to 150 C | 7-pin PSOF |
| ACS781LLRTR-100U-T | Unidirectional 0 to 100 A | 26.4 mV/A | 40 to 150 C | 7-pin PSOF |
| ACS781KLRTR-150B-T | Bidirectional 150 A (transient), 100 A (continuous) | 8.8 mV/A | 40 to 125 C | 7-pin PSOF |
| ACS781KLRTR-150U-T | Unidirectional 0 to 150 A (transient), 0 to 100 A (continuous) | 17.6 mV/A | 40 to 125 C | 7-pin PSOF |
| Characteristic | Symbol | Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| Supply Voltage | VCC | 3 | 3.3 | 3.6 | V | |
| Supply Current | ICC | Output open | 11 | 15 | mA | |
| Internal Conductor Resistance | RPRIMARY | TA = 25C | 200 | |||
| Bandwidth | BWi | Small signal 3 dB, CL = 1 nF, TA = 25C | 120 | kHz | ||
| Output Rise Time | tr | TA = 25C, CL = 1 nF | 3 | s | ||
| Response Time | tRESPONSE | TA = 25C, CL = 1 nF | 3.6 | s | ||
| Quiescent Output Voltage (Bidirectional) | VOUT(QBI) | IP = 0 A, TA = 25C | VCC/2 | V | ||
| Quiescent Output Voltage (Unidirectional) | VOUT(QU) | IP = 0 A, TA = 25C | VCC 0.1 | V | ||
| Package Thermal Resistance | RJA | Mounted on Allegro evaluation board | 18 | C/W | ||
| Maximum Junction Temperature | TJ(max) | 165 | C |
2410010330_ALLEGRO-ACS781LLRTR-050U-T_C163300.pdf
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