Product Overview
The Allegro ACS72981 family of current sensor ICs offers economical and precise solutions for AC or DC current sensing. With a 250 kHz bandwidth, these sensors are ideal for motor control, load detection and management, power supply and DC-to-DC converter control, and inverter control. A response time of less than 2 s enables overcurrent fault detection in safety-critical applications. The device utilizes a precision, low-offset linear Hall circuit with an integrated copper conduction path. Applied current generates a magnetic field, which the Hall IC converts into a proportional voltage. Proprietary digital temperature compensation ensures accuracy over temperature and lifetime. The internal resistance of the conductive path is typically 200 , minimizing power loss and maximizing power density. Differential sensing techniques virtually eliminate output disturbance from common-mode magnetic fields.
Product Attributes
- Brand: Allegro
- Certifications: AEC-Q100 automotive qualification
- Material: Lead (Pb) free, 100% matte tin plating, oxygen-free copper leadframe
- Package: 7-pin PSOF package (suffix LR)
Technical Specifications
| Model/Part Number | Primary Sampled Current (IP) | Sensitivity (Sens) (Typ.) | Nominal Supply Voltage (VCC) | Operating Temperature Range | Bandwidth | Response Time | Internal Conductor Resistance |
|---|---|---|---|---|---|---|---|
| ACS72981LLRATR-050B3 | 50 A | 26.4 mV/A | 3.3 V | -40 to 150 C | 250 kHz | < 2 s | 200 (typical) |
| ACS72981LLRATR-050B5 | 50 A | 40 mV/A | 5 V | -40 to 150 C | |||
| ACS72981LLRATR-050U3 | 50 A | 52.8 mV/A | 3.3 V | -40 to 150 C | |||
| ACS72981LLRATR-050U5 | 50 A | 80 mV/A | 5 V | -40 to 150 C | |||
| ACS72981LLRATR-100B3 | 100 A | 13.2 mV/A | 3.3 V | -40 to 150 C | 250 kHz | < 2 s | |
| ACS72981LLRATR-100B5 | 100 A | 20 mV/A | 5 V | -40 to 150 C | |||
| ACS72981LLRATR-100U3 | 100 A | 26.4 mV/A | 3.3 V | -40 to 150 C | |||
| ACS72981LLRATR-100U5 | 100 A | 40 mV/A | 5 V | -40 to 150 C | |||
| ACS72981KLRATR-150B3 | 150 A | 8.8 mV/A | 3.3 V | -40 to 125 C | 250 kHz | < 2 s | |
| ACS72981KLRATR-150B5 | 150 A | 13.33 mV/A | 5 V | -40 to 125 C | |||
| ACS72981KLRATR-150U3 | 150 A | 17.6 mV/A | 3.3 V | -40 to 125 C | |||
| ACS72981KLRATR-150U5 | 150 A | 26.66 mV/A | 5 V | -40 to 125 C | |||
| ACS72981ELRATR-200B3 | 200 A | 6.6 mV/A | 3.3 V | -40 to 85 C | 250 kHz | < 2 s | |
| ACS72981ELRATR-200B5 | 200 A | 10 mV/A | 5 V | -40 to 85 C | |||
| ACS72981ELRATR-200U3 | 200 A | 13.2 mV/A | 3.3 V | -40 to 85 C | |||
| ACS72981ELRATR-200U5 | 200 A | 20 mV/A | 5 V | -40 to 85 C | |||
| Supply Voltage (VCC) | 4.5 - 5.5 V (5V variant) or 3 - 3.6 V (3.3V variant) | ||||||
| Supply Current (ICC) | 14 mA (typical, no load) | ||||||
| Power-On Delay (tPO) | 70 s (typical) | ||||||
| Bandwidth (Internal) | 250 kHz | ||||||
| Response Time (tRESPONSE) | 1.8 s (typical) | ||||||
| Overcurrent Capability (IPOC) | Up to 285 A (1 second on time, 60 seconds off time at 25C) | ||||||
| Maximum Continuous Current (ICMAX) | 120 A (at 25C) | ||||||
| Maximum Junction Temperature (TJ(max)) | 165 C | ||||||
2201271800_ALLEGRO-ACS72981LLRATR-050B5_C1864157.pdf
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