Allegro MicroSystems CT431 XtremeSense® TMR Sensors

Allegro MicroSystems CT431 XtremeSense^® TMR Sensors are high bandwidth and ultra-low noise integrated contact current sensors. The CT431 utilizes the patented XtremeSense TMR technology to enable high-accuracy current measurements for many consumer, enterprise, and industrial applications.

The Allegro CT431 XtremeSense TMR Sensors support six current ranges, allowing the integrated current-carrying conductor (CCC) to handle up to 50A of current and generate a current measurement as a linear analog output voltage. The CT431 Sensors deliver a total output error of less than ±1.0% full-scale (FS) over-voltage and the full temperature range.

The devices provide less than 1.0µs output response time while the current consumption is about 6.0mA and is immune to common mode fields. The CT431 features an integrated over-current detection (OCD) circuitry to identify out-of-range currents (OCD) with the result outputted to the fault-bar (FLT) pin. The FLT is an open drain, an active LOW digital signal that the CT431 activates to alert the microcontroller that a fault condition has occurred.

The CT431 is available in an industry-standard 16-lead SOIC-wide “green” and RoHS-compliant package.

Features

Integrated Contact Current Sensing for Low to Medium Current Ranges:
- 0A to +20A
- -20A to +20A
- 0A to +30A
- -30A to +30A
- 0A to +50A
- -50A to +50A
Integrated Current-Carrying Conductor (CCC)
Linear analog output voltage
Total error output ≥ ±1.0% FS, -40°C to +125°C

1MHz bandwidth
Response time <1.0µs
Reference voltage output for AC/DC current measurements
VOUT – VREF < 1.0% (Typical)
Low noise performance
- <0.5mA/G Immunity to common-mode fields
- Over-Current Detection (OCD™)
Out of range currents
- 16-Lead SOIC-Wide package