Product Overview
The CT427 is a high-bandwidth, ultra-low noise integrated contact current sensor utilizing 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. The device boasts a total output error of less than 1.0% full-scale (FS), a 300 ns output response time, and immunity to common mode fields. Integrated overcurrent detection (OCD) circuitry alerts the microcontroller via an active low fault (FLT) pin. The CT427 is offered in an industry-standard, green, RoHS-compliant 8-lead SOIC package.
Product Attributes
- Brand: Allegro MicroSystems
- Technology: XtremeSense TMR
- Certifications: UL/IEC 62368-1, UL1577, AEC-Q100 Grade 1
- Package: 8-lead SOIC
- Compliance: Green, RoHS compliant
Technical Specifications
| Model/Specification | Value | Unit |
|---|---|---|
| Product Name | CT427 | |
| Max Current Carrying Conductor (ICCC_MAX) | 65 | A |
| Total Output Error (ETOT) | 1.0 | % FS |
| Output Response Time (tRESPONSE) | 300 | ns |
| Current Consumption (ICC) | 6.0 | mA |
| Bandwidth (fBW) | 1.0 | MHz |
| Supply Voltage (VCC) | 3.0 - 3.6 | V |
| Rated Isolation Voltage (VISO) | 3.5 | kVRMS |
| Working Voltage for Basic Isolation (VWVBI) | 560 | VRMS |
| Working Voltage for Reinforced Isolation (VWBRI) | 280 | VRMS |
| Noise (eN) @ 100 kHz | 9.5 - 19.0 | mARMS |
| Common Mode Field Rejection Ratio (CMFRR) | -54 | dB |
| Package Dimensions | 4.89 mm 6.00 mm 1.62 mm | |
| Operating Temperature Range | -40 to 125 | C |
| Current Ranges Supported | 0 to 20 A, 20 A, 0 to 30 A, 30 A, 0 to 50 A, 50 A, 0 to 65 A, 65 A | |
| Part Number Example (20A Unipolar) | CT427-HSN820DR | |
| Part Number Example (20A Bipolar) | CT427-HSN820MR | |
| Part Number Example (30A Unipolar) | CT427-HSN830DR | |
| Part Number Example (30A Bipolar) | CT427-HSN830MR | |
| Part Number Example (50A Unipolar) | CT427-HSN850DR | |
| Part Number Example (50A Bipolar) | CT427-HSN850MR | |
| Part Number Example (65A Unipolar) | CT427-HSN865DR | |
| Part Number Example (65A Bipolar) | CT427-HSN865MR | |
| Applications | Solar/power inverters, UPS, SMPS, and telecom power supplies, Motor control, Power utility meter, Overcurrent fault protection | |
| Overcurrent Detection (OCD) Threshold (Unipolar) | 1.1 x IRANGE(MAX) (Rising), 0.9 x IRANGE(MAX) (Falling) | A |
| Overcurrent Detection (OCD) Threshold (Bipolar) | 1.1 x IRANGE(MAX) (Rising), 0.9 x IRANGE(MAX) (Falling) | A |
| Undervoltage Lockout (UVLO) Threshold | 2.45 (Falling) / 2.50 (Rising) | V |
| Power-On Time (tON) | 100 - 200 | s |
| Rise Time (tRISE) | 200 | ns |
| Propagation Delay (tDELAY) | 250 | ns |
| FLT Response Time (tFLT#) | 250 | ns |
2504291722_ALLEGRO-CT427-HSN820MR_C22442737.pdf
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