Product Overview
The Allegro CT431 is a high-bandwidth, ultra-low noise integrated contact current sensor utilizing Allegro's XtremeSense TMR technology for high-accuracy current measurements. It offers nine selectable current ranges up to 65 A, a linear analog output voltage, and achieves a total output error of less than 1.0% full-scale over voltage and temperature. The device features a ~300 ns output response time, low current consumption (~6.0 mA), and immunity to common mode fields. An integrated overcurrent detection (OCD) circuit alerts the microcontroller via an active-low fault signal (FLT) pin. It is available in an industry-standard 16-lead SOIC wide package.
Product Attributes
- Brand: Allegro MicroSystems
- Technology: XtremeSense TMR
- Package Type: 16-lead SOICW
- Compliance: Green and RoHS compliant
- Certifications: UL/IEC 62368-1 and UL1577 certified
- AEC-Q100 Grade 1 Qualified
Technical Specifications
| Model | Current Range (IPMAX) | Sensitivity (mV/A) | Operating Temperature Range (C) | Package | Total Output Error (FS) | Bandwidth | Response Time | Supply Voltage |
|---|---|---|---|---|---|---|---|---|
| CT431-HSWF20MR / CT431-ASWF20MR | 20 A | 50 | 40 to 125 | 16-lead SOICW | 1.0% | 1 MHz | ~300 ns | 3.0 to 3.6 V |
| CT431-HSWF30MR / CT431-ASWF30MR | 30 A | 33.3 | 40 to 125 | 16-lead SOICW | 1.0% | 1 MHz | ~300 ns | 3.0 to 3.6 V |
| CT431-HSWF40MR | 40 A | 25 | 40 to 125 | 16-lead SOICW | 1.0% | 1 MHz | ~300 ns | 3.0 to 3.6 V |
| CT431-HSWF50MR / CT431-ASWF50MR | 50 A | 20 | 40 to 125 | 16-lead SOICW | 1.0% | 1 MHz | ~300 ns | 3.0 to 3.6 V |
| CT431-HSWF65MR / CT431-ASWF65MR | 65 A | 15.4 | 40 to 125 | 16-lead SOICW | 1.0% | 1 MHz | ~300 ns | 3.0 to 3.6 V |
| CT431-HSWF20DR / CT431-ASWF20DR | 0 to 20 A | 100 | 40 to 125 | 16-lead SOICW | 1.0% | 1 MHz | ~300 ns | 3.0 to 3.6 V |
| CT431-HSWF30DR / CT431-ASWF30DR | 0 to 30 A | 66.7 | 40 to 125 | 16-lead SOICW | 1.0% | 1 MHz | ~300 ns | 3.0 to 3.6 V |
| CT431-HSWF50DR / CT431-ASWF50DR | 0 to 50 A | 40 | 40 to 125 | 16-lead SOICW | 1.5% | 1 MHz | ~300 ns | 3.0 to 3.6 V |
| CT431-HSWF65DR / CT431-ASWF65DR | 0 to 65 A | 30.8 | 40 to 125 | 16-lead SOICW | 1.5% | 1 MHz | ~300 ns | 3.0 to 3.6 V |
| Key Features: Integrated current carrying conductor (CCC), Linear analog output voltage, Low noise (9.5 to 19.0 mARMS @ fBW = 100 kHz), Immunity to common mode fields (54 dB), Integrated overcurrent detection (OCD) circuitry, Fault# Interrupt (FLT) pin. | ||||||||
| Applications: Solar/power inverters, UPS, SMPS, and telecom power supplies, Battery management systems, Motor control, White goods, Power utility meter. | ||||||||
2504181640_ALLEGRO-CT431-HSWF20MR_C22442740.pdf
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