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. The device offers a total output error of less than 1.0% full-scale (FS), a 300 ns output response time, and immunity to common mode fields. An integrated overcurrent detection (OCD) circuitry alerts the microcontroller via an active-low fault (FLT) pin when currents are out of range. Designed for industrial, consumer, and automotive applications, it is available in an industry-standard 8-lead SOIC package.
Product Attributes
- Brand: Allegro MicroSystems
- Technology: XtremeSense TMR
- 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 Carrying Conductor (CCC) Max Current | Up to 65 A | |
| Total Output Error | < 1.0% FS | |
| Output Response Time | ~300 ns | |
| Bandwidth | 1 MHz | |
| Current Consumption | ~6.0 mA | |
| Common Mode Field Immunity | -54 dB | |
| Overcurrent Detection (OCD) | Integrated circuitry, output to FLT pin | |
| Fault Output (FLT) | Open drain, active low digital signal | |
| Supply Voltage | 3.0 to 3.6 V | |
| Noise (Typical at 100 kHz BW) | 9.5 to 19.0 mARMS | |
| Package | 8-lead SOIC | |
| Rated Isolation Voltage | 3.5 kVRMS | |
| Working Voltage (Basic Isolation) | 560 VRMS | |
| Working Voltage (Reinforced Isolation) | 280 VRMS | |
| Applications | Solar/power inverters, UPS, SMPS, telecom power supplies, motor control, power utility meter, overcurrent fault protection | |
| Model / Current Range | Sensitivity (Typ.) | Operating Temperature |
| CT427-HSN820MR / 20 A | 50 mV/A | 40 to 125 C |
| CT427-HSN830MR / 30 A | 33.3 mV/A | 40 to 125 C |
| CT427-HSN850MR / 50 A | 20 mV/A | 40 to 125 C |
| CT427-HSN865MR / 65 A | 15.4 mV/A | 40 to 125 C |
| CT427-HSN820DR / 0 to 20 A | 100 mV/A | 40 to 125 C |
| CT427-HSN830DR / 0 to 30 A | 66.7 mV/A | 40 to 125 C |
| CT427-HSN850DR / 0 to 50 A | 40 mV/A | 40 to 125 C |
| CT427-HSN865DR / 0 to 65 A | 30.8 mV/A | 40 to 125 C |
| CT427-ASN820MR / 20 A (AEC-Q100 Grade 1) | 50 mV/A | 40 to 125 C |
| CT427-ASN830MR / 30 A (AEC-Q100 Grade 1) | 33.3 mV/A | 40 to 125 C |
| CT427-ASN850MR / 50 A (AEC-Q100 Grade 1) | 20 mV/A | 40 to 125 C |
| CT427-ASN865MR / 65 A (AEC-Q100 Grade 1) | 15.4 mV/A | 40 to 125 C |
| CT427-ASN820DR / 0 to 20 A (AEC-Q100 Grade 1) | 100 mV/A | 40 to 125 C |
| CT427-ASN830DR / 0 to 30 A (AEC-Q100 Grade 1) | 66.7 mV/A | 40 to 125 C |
| CT427-ASN850DR / 0 to 50 A (AEC-Q100 Grade 1) | 40 mV/A | 40 to 125 C |
| CT427-ASN865DR / 0 to 65 A (AEC-Q100 Grade 1) | 30.8 mV/A | 40 to 125 C |
| Package Dimensions (SOIC-8) | 4.89 mm 6.00 mm 1.62 mm | |
| Power-On Time (tON) | 100 s (typical) | |
| Rise Time (tRISE) | 200 ns (typical) | |
| Propagation Delay (tDELAY) | 250 ns (typical) | |
| Undervoltage Lockout (UVLO) | Rising: 2.50 V, Falling: 2.45 V |
2504251618_ALLEGRO-CT427-HSN850DR_C29129396.pdf
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