Product Overview
The Allegro ACS781xLR is a fully integrated, automotive-grade linear Hall-effect current sensor IC designed for high-precision 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 ultra-low power loss due to its 200 internal conductor resistance. The device features advanced Hall sensor technology with common-mode field rejection for optimal performance in the presence of interfering magnetic fields. It provides an analog output voltage (VOUT) that varies linearly with the primary current (IP). Key advantages include factory-trimmed accuracy, chopper-stabilized signal path for stability across temperature ranges, and integrated shielding for high-level immunity to dV/dt and stray electric fields, making it ideal for high-side, high-voltage applications. The ACS781xLR is AEC-Q100 qualified.
Product Attributes
- Brand: Allegro
- Package Type: 7-pin PSOF (suffix LR)
- Certifications: AEC-Q100 Automotive Qualification
- Lead Finish: 100% matte tin
- Leadframe Material: Oxygen-free copper
- RoHS Compliant: Lead (Pb) free
Technical Specifications
| Model | Sensed Current (IP) | Direction | Sensitivity (Typ.) (mV/A) | Operating Temperature (C) | Package |
|---|---|---|---|---|---|
| ACS781LLRTR-050B-T | 50 A | Bidirectional | 26.4 | -40 to 150 | Tape and reel |
| ACS781LLRTR-050U-T | 0 to 50 A | Unidirectional | 39.6 | -40 to 150 | Tape and reel |
| ACS781LLRTR-100B-T | 100 A | Bidirectional | 13.2 | -40 to 150 | Tape and reel |
| ACS781LLRTR-100U-T | 0 to 100 A | Unidirectional | 26.4 | -40 to 150 | Tape and reel |
| ACS781KLRTR-150B-T | 150 A (transient) 100 A (continuous) | Bidirectional | 8.8 | -40 to 125 | Tape and reel |
| ACS781KLRTR-150U-T | 0 to 150 A (transient) 0 to 100 A (continuous) | Unidirectional | 17.6 | -40 to 125 | Tape and reel |
| Characteristic | Symbol | Test 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 | ||
| Nominal Operating Ambient Temperature | TOP Range K | -40 | 125 | C | ||
| Nominal Operating Ambient Temperature | TOP Range L | -40 | 150 | C | ||
| Maximum Junction Temperature | TJ(max) | 165 | C | |||
| Storage Temperature | Tstg | -65 | 165 | C |
| Characteristic | Symbol | Test Conditions | Rating | Unit |
|---|---|---|---|---|
| Overcurrent | IPOC | TA = 25C, 1 s on time, 60 s off time | 285 | A |
| Overcurrent | IPOC | TA = 85C, 1 s on time, 35 s off time | 225 | A |
| Overcurrent | IPOC | TA = 125C, 1 s on time, 30 s off time | 170 | A |
| Overcurrent | IPOC | TA = 150C, 1 s on time, 10 s off time | 95 | A |
| Characteristic | Symbol | Test Conditions | Value | Unit |
|---|---|---|---|---|
| Package Thermal Resistance | RJA | Mounted on Allegro evaluation board ASEK781-85-0807-001 with FR4 substrate and 8 layers of 2 oz. copper (1530 mm per layer) connected to primary leadframe and thermal vias. Includes power consumed by PCB. | 18 | C/W |
| Characteristic | Symbol | Notes | Rating | Unit |
|---|---|---|---|---|
| Forward Supply Voltage | VCC | 6 | V | |
| Reverse Supply Voltage | VRCC | -0.5 | V | |
| Forward Output Voltage | VOUT | 25 | V | |
| Reverse Output Voltage | VRIOUT | -0.5 | V | |
| Output Source Current | IOUT(Source) | VOUT to GND | 2.8 | mA |
| Output Sink Current | IOUT(Sink) | Minimum pull-up resistor of 500 | 10 | mA |
2504101957_ALLEGRO-ACS781LLRTR-100U-T_C2654916.pdf
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