Product Overview
The Allegro ACS70331 is a high-sensitivity, integrated current sensor IC utilizing Giant Magneto-Resistive (GMR) technology for current sensing applications up to 5 A. It offers a 25x improvement in sensitivity over traditional Hall-effect sensors, providing a low-noise, high-speed analog output proportional to AC and DC current. With a 1 MHz bandwidth and a response time of 535 ns, it is suitable for magnetically noisy environments due to its differential GMR element configuration and significant rejection of stray magnetic fields. The device operates from a single 3.3 V supply and is available in space-saving QFN-12 and SOIC-8 surface-mount packages. It is factory-programmed with four sensitivity and offset levels to optimize performance across various current measurement ranges.
Product Attributes
- Brand: Allegro
- Technology: Giant Magneto-Resistive (GMR)
Technical Specifications
| Feature | Specification | Details |
|---|---|---|
| Current Sensing Capability | Up to 5 A (DC or AC) | |
| Bandwidth | 1 MHz | |
| Response Time | < 550 ns (typically 535 ns) | |
| Noise | 8 mA(rms) at 1 MHz | |
| Output Type | Non-ratiometric, Analog | Proportional to AC and DC current |
| Supply Voltage | Single 3.3 V | Also supports 3 V to 4.5 V operation (high DC PSRR) |
| Primary Conductor Resistance | 1.1 m (QFN-12) | 1.7 m (SOIC-8) |
| Packages | 12-contact QFN (3 mm 3 mm 0.75 mm) | 8-lead SOIC |
| Operating Temperature Range | -40C to 85C | Commercial temperature range |
| Stray Field Rejection | High | Differential GMR configuration |
| Absolute Maximum Supply Voltage | 7 V | |
| Maximum Continuous Current | 10 A | |
| Maximum Junction Temperature | 100C | |
| Selection Guide (Examples) | ||
| Part Number | ACS70331EESATR-2P5U3 | Current Sensing Range: 0 to 2.5 A, Sensitivity: 800 mV/A, Package: 12-contact QFN |
| Part Number | ACS70331EOLCTR-005B3 | Current Sensing Range: 5 A, Sensitivity: 200 mV/A, Package: 8-lead SOIC |
| Electrical Characteristics | ||
| Supply Current (ICC) | 4.5 mA (typ) | |
| Power-On Time (tPO) | 5 s (typ) | |
| Fuse Power Down Time (tFPD) | 80-120 s (typ) | |
| Output Resistive Load (RL) | 22 k | |
| Output Capacitive Load (CL) | 100 pF (stable) / 50 pF (maintains BW) | |
| Source Current (ISource) | 0.4 mA (typ) | |
| Sink Current (ISINK) | 0.5 mA (typ) | |
| Bandwidth (BW) | 1 MHz (-3 dB) | |
| Noise Density (IND) | 8 ARMS/Hz (input referred) | |
| Power Supply Rejection Ratio (PSRR) | -40 dB (DC to 100 Hz) | -30 dB (100 Hz to 100 kHz) |
| Power Supply Offset Error (VOE(PS)) | 10 mV (typ) | |
| Power Supply Sensitivity Error (ESENS(PS)) | 0.5 % (typ) | |
| Nonlinearity (ELIN) | 0.2 % (typ) |
2306061118_ALLEGRO-ACS70331EOLCTR-2P5U3_C459301.pdf
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