Product Overview
The Allegro ACS72981 family of current sensor ICs offers economical and precise solutions for bidirectional AC or DC current sensing. With a 250 kHz bandwidth and a response time under 2 s, these sensors are ideal for applications such as motor control, load detection and management, power supply control, DC-to-DC converter control, and inverter control. They are particularly suited for safety-critical applications requiring overcurrent fault detection. The ACS72981 utilizes a precision, low-offset linear Hall circuit with an integrated copper conduction path, generating a magnetic field proportional to the primary current. This magnetic field is converted into a proportional voltage output (VOUT). Proprietary digital temperature compensation ensures accuracy over temperature and lifetime. The typical internal resistance of the current conduction path is 200 , minimizing power loss and enhancing power density. Differential sensing techniques effectively eliminate output disturbances 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 | Primary Sampled Current (IP) | Sensitivity (Sens Typ.) | Nominal Supply Voltage (VCC) | Operating Temperature Range (TA) | 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 |
| 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 | 250 kHz | < 2 s | |
| 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 | 250 kHz | < 2 s | |
| 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 | 250 kHz | < 2 s | 200 |
| 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 | 200 |
| 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 | 250 kHz | < 2 s | 200 |
| ACS72981ELRATR-200U5 | 200 A | 20 mV/A | 5 V | 40 to 85 C | |||
| Supply Voltage (VCC): 3.0 V to 3.6 V (3.3V variant) / 4.5 V to 5.5 V (5V variant) | |||||||
| Supply Current (ICC): 14 mA (typical) | |||||||
| Power-On Delay (tPO): 70 s (typical) | |||||||
| Output Response Time (tRESPONSE): 1.8 s (typical) | |||||||
| Primary Conductor Resistance: 200 (typical) | |||||||
| Overcurrent Capability (IPOC): Up to 285 A (1 second on time, 60 seconds off time, TA = 25C) | |||||||
| Maximum Junction Temperature (TJ(max)): 165 C | |||||||
2408150958_ALLEGRO-ACS72981LLRATR-100B3_C22853488.pdf
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