Product Overview
The Allegro ACS70331 is a high-sensitivity, 1 MHz GMR-based current sensor IC designed for applications requiring current sensing up to 5 A. Leveraging Giant Magneto-Resistive (GMR) technology, it offers 25 times greater sensitivity than traditional Hall-effect sensors. This enables precise measurement of AC and DC currents with a low-noise, high-speed analog output proportional to the sensed current. The sensor boasts a fast response time of typically 535 ns and operates from a single 3.3 V supply. Its integrated low-resistance primary conductor minimizes power loss, while the differential GMR element configuration provides excellent rejection of stray magnetic fields for stable operation in noisy environments. Available in space-saving QFN-12 and SOIC-8 packages, the ACS70331 is suitable for a wide range of applications, including power monitoring, industrial controls, and consumer electronics.
Product Attributes
- Brand: Allegro MicroSystems
- Technology: Giant Magneto-Resistive (GMR)
Technical Specifications
| Model | Current Sensing Range (IPR) | Sensitivity (Typ) | Temperature Range (TA) | Package | Packing |
|---|---|---|---|---|---|
| ACS70331EESATR-2P5U3 | 0 to 2.5 A | 800 mV/A | 40 to 85C | 12-contact QFN | 1500 pieces per reel |
| ACS70331EESATR-2P5B3 | 2.5 A | 400 mV/A | 40 to 85C | 12-contact QFN | 1500 pieces per reel |
| ACS70331EESATR-005U3 | 0 to 5 A | 400 mV/A | 40 to 85C | 12-contact QFN | 1500 pieces per reel |
| ACS70331EESATR-005B3 | 5 A | 200 mV/A | 40 to 85C | 12-contact QFN | 1500 pieces per reel |
| ACS70331EOLCTR-2P5U3 | 0 to 2.5 A | 800 mV/A | 40 to 85C | 8-lead SOIC | 3000 pieces per reel |
| ACS70331EOLCTR-2P5B3 | 2.5 A | 400 mV/A | 40 to 85C | 8-lead SOIC | 3000 pieces per reel |
| ACS70331EOLCTR-005U3 | 0 to 5 A | 400 mV/A | 40 to 85C | 8-lead SOIC | 3000 pieces per reel |
| ACS70331EOLCTR-005B3 | 5 A | 200 mV/A | 40 to 85C | 8-lead SOIC | 3000 pieces per reel |
Key Features and Benefits
- High sensitivity current sensor IC for sensing up to 5 A (DC or AC).
- 1 MHz bandwidth with response time <550 ns.
- Low noise: 8 mA(rms) at 1 MHz.
- Non-ratiometric, analog output proportional to AC and DC current.
- Single 3.3 V supply operation.
- High DC PSRR enables use with low accuracy power supplies or batteries (3 to 4.5 V operation).
- 1.1 m primary conductor resistance (QFN) results in low power loss.
- Small surface mount QFN-12 and SOIC-8 packages for space-constrained applications.
- Significant rejection of stray magnetic fields due to differential GMR element configuration.
Electrical Characteristics
| Characteristic | Symbol | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| Supply Voltage | VCC | 3.0 | 3.3 | 4.5 | V | |
| Supply Current | ICC | VCC(min) VCC VCC(max), no load on VIOUT, fuses powered down | 4.5 | 6 | mA | |
| Primary Conductor Resistance | RIP | QFN-12 package, TA = 25C | 1.1 | m | ||
| Primary Conductor Resistance | RIP | SOIC-8 package, TA = 25C | 1.7 | m | ||
| Bandwidth | BW | 3 dB bandwidth | 1 | MHz | ||
| Response Time | tRESPONSE | 1 V swing on VIOUT, 80% to 80% | 535 | ns | ||
| Input referred noise density | IND | 8 | ARMS/(Hz) |
Package Dimensions
12-contact QFN (ES package): 3 mm 3 mm 0.75 mm
8-contact SOIC (OL package): Dimensions as per standard SOIC-8 package outline.
Note on Product Status
The ACS70331 has been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available.
2408081044_ALLEGRO-ACS70331EESATR-2P5U3_C459299.pdf
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