Product Overview
The Allegro CT431 is a high-bandwidth, ultra-low noise integrated contact current sensor utilizing Allegro's patented XtremeSense TMR technology. It offers high accuracy current measurements with a total output error of less than 1.0% full-scale across voltage and temperature. The device supports nine current ranges up to 65 A, featuring an integrated current-carrying conductor (CCC) and a linear analog output voltage. It includes an integrated overcurrent detection (OCD) circuit with a fault output (FLT) pin. The CT431 is suitable for industrial, consumer, and automotive applications such as solar/power inverters, UPS, SMPS, telecom power supplies, battery management systems, motor control, white goods, and power utility meters.
Product Attributes
- Brand: Allegro MicroSystems
- Technology: XtremeSense TMR
- Package Type: 16-lead SOICW (Small Outline Integrated Circuit Wide)
- Compliance: Green and RoHS compliant
- Certifications: UL/IEC 62368-1 and UL1577 certified
- AEC-Q100 Grade 1 Qualified (for specific models)
Technical Specifications
| Model | Current Range (IPMAX) | Sensitivity (mV/A) | Bandwidth | Response Time | Total Output Error | Operating Temperature Range | Supply Voltage | Package Dimensions (mm) |
|---|---|---|---|---|---|---|---|---|
| CT431-HSWF20MR / CT431-ASWF20MR | 20 A | 50 | 1 MHz | ~300 ns | 1.0% FS | 40C to 125C | 3.0 to 3.6 V | 10.21 10.31 2.54 |
| CT431-HSWF30MR / CT431-ASWF30MR | 30 A | 33.3 | 1 MHz | ~300 ns | 1.0% FS | 40C to 125C | 3.0 to 3.6 V | 10.21 10.31 2.54 |
| CT431-HSWF40MR | 40 A | 25 | 1 MHz | ~300 ns | 1.0% FS | 40C to 125C | 3.0 to 3.6 V | 10.21 10.31 2.54 |
| CT431-HSWF50MR / CT431-ASWF50MR | 50 A | 20 | 1 MHz | ~300 ns | 1.0% FS | 40C to 125C | 3.0 to 3.6 V | 10.21 10.31 2.54 |
| CT431-HSWF65MR / CT431-ASWF65MR | 65 A | 15.4 | 1 MHz | ~300 ns | 1.0% FS | 40C to 125C | 3.0 to 3.6 V | 10.21 10.31 2.54 |
| CT431-HSWF20DR / CT431-ASWF20DR | 0 to 20 A | 100 | 1 MHz | ~300 ns | 1.0% FS | 40C to 125C | 3.0 to 3.6 V | 10.21 10.31 2.54 |
| CT431-HSWF30DR / CT431-ASWF30DR | 0 to 30 A | 66.7 | 1 MHz | ~300 ns | 1.0% FS | 40C to 125C | 3.0 to 3.6 V | 10.21 10.31 2.54 |
| CT431-HSWF50DR / CT431-ASWF50DR | 0 to 50 A | 40 | 1 MHz | ~300 ns | 1.5% FS | 40C to 125C | 3.0 to 3.6 V | 10.21 10.31 2.54 |
| CT431-HSWF65DR / CT431-ASWF65DR | 0 to 65 A | 30.8 | 1 MHz | ~300 ns | 1.5% FS | 40C to 125C | 3.0 to 3.6 V | 10.21 10.31 2.54 |
| Isolation Ratings: - Impulse Withstand Voltage (VIMPULSE): 8000 VPK - Dielectric Withstand Voltage (VISO): 5000 VRMS - Working Voltage for Basic Isolation (VWVBI): 1100 VRMS - Working Voltage for Reinforced Isolation (VWBRI): 550 VRMS - Creepage Distance (DCR): 7.8 mm - Clearance Distance (DCL): 7.8 mm - Distance Through Isolation (DTI): 110 m | ||||||||
| Overcurrent Detection (OCD): - Unipolar (DC): 1.1 IRANGE(MAX) rising, 0.9 IRANGE(MAX) falling - Bipolar (AC): > 110% of IRANGE(MAX) rising, < 90% of IRANGE(MAX) falling | ||||||||
| Undervoltage Lockout (UVLO): - Rising VDD: 2.50 V - Falling VDD: 2.45 V | ||||||||
| Other Specifications: - Supply Current (ICC): ~6.0 mA - Noise (eN): 9.5 to 19.0 mARMS @ fBW = 100 kHz - Immunity to Common Mode Fields (CMFRR): 54 dB | ||||||||
2508121523_ALLEGRO-CT431-HSWF20DR_C22463582.pdf
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