Product Overview
The CT427 is a high-bandwidth, ultra-low noise integrated contact current sensor leveraging Allegro's XtremeSense TMR technology for high-accuracy current measurements. It supports eight current ranges, with the integrated current-carrying conductor (CCC) handling up to 65 A and providing a linear analog output voltage. Achieving a total output error of less than 1.0% full-scale (FS), the CT427 offers a 300 ns output response time and is immune to common mode fields. It features integrated overcurrent detection (OCD) circuitry that signals faults via an open-drain, active-low FLT pin. Designed for industrial, consumer, and automotive applications, it is offered in an industry-standard, green, RoHS-compliant 8-lead SOIC package.
Product Attributes
- Brand: Allegro MicroSystems
- Technology: XtremeSense TMR
- Package: 8-lead SOIC
- Certifications: UL/IEC 62368-1, UL1577, AEC-Q100 Grade 1
- Compliance: Green, RoHS compliant
Technical Specifications
| Feature | Specification | Details |
|---|---|---|
| Product Name | CT427 | XtremeSense TMR Current Sensor |
| Current Ranges | 8 Ranges | 0 to 20 A, 20 A, 0 to 30 A, 30 A, 0 to 50 A, 50 A, 0 to 65 A, 65 A |
| Max Current Handling (CCC) | Up to 65 A | |
| Total Output Error | < 1.0% FS | |
| Bandwidth | 1 MHz | |
| Output Response Time | ~300 ns | |
| Current Consumption | ~6.0 mA | |
| Common Mode Field Immunity | -54 dB | |
| Overcurrent Detection (OCD) | Integrated circuitry | Outputs to FLT pin |
| Fault Output (FLT) | Open drain, active low | Signals out-of-range currents and UVLO |
| Supply Voltage | 3.0 to 3.6 V | Recommended: 3.3 V |
| Noise | 9.5 to 19.0 mARMS | @ fBW = 100 kHz |
| Isolation Voltage (Rated) | 3.5 kVRMS | |
| Isolation Voltage (Working, Basic) | 560 VRMS | |
| Isolation Voltage (Working, Reinforced) | 280 VRMS | |
| Power-On Time | 100 s (typ.) | |
| Rise Time | 200 ns (typ.) | |
| Propagation Delay | 250 ns (typ.) | |
| Undervoltage Lockout (UVLO) | 2.45 V (falling), 2.50 V (rising) | |
| Package Dimensions | 8-lead SOIC | 4.89 mm 6.00 mm 1.62 mm |
| Operating Temperature | -40C to 125C | Extended Industrial & Automotive |
| Model Example (20A Unipolar) | CT427-HSN820DR | AEC-Q100 Grade 1 |
| Model Example (20A Bipolar) | CT427-HSN820MR | AEC-Q100 Grade 1 |
| Model Example (65A Bipolar) | CT427-HSN865MR | AEC-Q100 Grade 1 |
2504251618_ALLEGRO-CT427-HSN820DR_C23675880.pdf
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