Allegro CT431 HSWF65MR ultra low noise current sensor with fast response and common mode field immunity
Product Overview
The CT431 is a high-bandwidth, ultra-low noise integrated contact current sensor leveraging Allegro's XtremeSense TMR technology for high-accuracy measurements. It supports nine current ranges, with an integrated current-carrying conductor (CCC) capable of handling up to 65 A. The device provides a linear analog output voltage with a total output error of less than 1.0% full-scale (FS) across voltage and temperature. Key features include a ~300 ns output response time, low current consumption (~6.0 mA), immunity to common mode fields, and integrated overcurrent detection (OCD) with a fault output (FLT) pin. It is offered in an industry-standard, green, RoHS-compliant 16-lead SOIC wide package.
Product Attributes
- Brand: Allegro MicroSystems
- Technology: XtremeSense TMR
- Certifications: UL/IEC 62368-1, UL1577, AEC-Q100 Grade 1
- Package: 16-lead SOICW
- Compliance: Green, RoHS compliant
Technical Specifications
| Feature/Model | Description/Value |
|---|---|
| Product Name | CT431 |
| Bandwidth | 1 MHz |
| Total Output Error | < 1.0% FS (over voltage and temperature) |
| Output Response Time | ~300 ns |
| Current Consumption | ~6.0 mA |
| Common Mode Field Rejection Ratio (CMFRR) | -54 dB |
| Supply Voltage | 3.0 to 3.6 V |
| Overcurrent Detection (OCD) | Integrated circuitry, output to FLT pin |
| Fault Output (FLT) | Open drain, active low digital signal |
| Rated Isolation Voltage | 5 kVRMS |
| Working Voltage for Basic Isolation | 1100 VRMS |
| Working Voltage for Reinforced Isolation | 550 VRMS |
| Noise (100 kHz BW) | 9.5 to 19.0 mARMS |
| Integrated Current Carrying Conductor (CCC) Max Current | Up to 65 A |
| Current Ranges | 0 to 20 A, 20 A, 0 to 30 A, 30 A, 40 A, 0 to 50 A, 50 A, 0 to 65 A, 65 A |
| Package Dimensions (Typ.) | 10.21 mm 10.31 mm 2.54 mm |
| Operating Temperature Range | -40C to 125C |
| CT431-HSWF20MR | Current Range: 20 A, Sensitivity: 50 mV/A |
| CT431-HSWF30MR | Current Range: 30 A, Sensitivity: 33.3 mV/A |
| CT431-HSWF40MR | Current Range: 40 A, Sensitivity: 25 mV/A |
| CT431-HSWF50MR | Current Range: 50 A, Sensitivity: 20 mV/A |
| CT431-HSWF65MR | Current Range: 65 A, Sensitivity: 15.4 mV/A |
| CT431-HSWF20DR | Current Range: 0 to 20 A, Sensitivity: 100 mV/A |
| CT431-HSWF30DR | Current Range: 0 to 30 A, Sensitivity: 66.7 mV/A |
| CT431-HSWF50DR | Current Range: 0 to 50 A, Sensitivity: 40 mV/A |
| CT431-HSWF65DR | Current Range: 0 to 65 A, Sensitivity: 30.8 mV/A |
| CT431-ASWF20MR | AEC-Q100 Grade 1, Current Range: 20 A, Sensitivity: 50 mV/A |
| CT431-ASWF30MR | AEC-Q100 Grade 1, Current Range: 30 A, Sensitivity: 33.3 mV/A |
| CT431-ASWF50MR | AEC-Q100 Grade 1, Current Range: 50 A, Sensitivity: 20 mV/A |
| CT431-ASWF65MR | AEC-Q100 Grade 1, Current Range: 65 A, Sensitivity: 15.4 mV/A |
| CT431-ASWF20DR | AEC-Q100 Grade 1, Current Range: 0 to 20 A, Sensitivity: 100 mV/A |
| CT431-ASWF30DR | AEC-Q100 Grade 1, Current Range: 0 to 30 A, Sensitivity: 66.7 mV/A |
| CT431-ASWF50DR | AEC-Q100 Grade 1, Current Range: 0 to 50 A, Sensitivity: 40 mV/A |
| CT431-ASWF65DR | AEC-Q100 Grade 1, Current Range: 0 to 65 A, Sensitivity: 30.8 mV/A |
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