We are offering these breakout boards with support from Allegro Microsystems as an easy way to use or evaluate their CT220 tunneling magnetoresistance (TMR), contactless current sensors. The following list details some of the sensors’ key features:
- Contactless current sensing measures the magnetic field of current flowing through nearby conductor
- Based on Allegro’s patented XtremeSense™ TMR (tunneling magnetoresistance) technology
- Does not require breaking the circuit to insert the sensor in series with the current path
- Inherently high electrical isolation
- Analog output voltage proportional to magnetic field can be converted into an accurate current measurement (with calibration)
- High linearity and resolution
- Stable performance over temperature
- Bidirectional (works in AC or DC systems); multiple sensitivity ranges available
- FLAG output indicates when field is above 90% or below 10% of full range
- Typical 20 µs response time
- On-board RC filter for reduced noise with 30 kHz bandwidth
- Operating temperature range of −40 °C to 125 °C
- Compact 0.4″ × 0.62″ board with slots for attaching to current-carrying wire
- Connection options: JST SH-style 4-pin connector (works with our 4-pin JST SH-style cables) or 0.1″-pitch pins
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Products in category “CT220 Contactless Current Sensor Carriers”
This board is a simple carrier of Allegro’s CT220BMV-HS5 TMR-based, contactless current sensor, which measures the magnetic field of the current flowing through a nearby conductor without needing to be connected in series with the circuit. With calibration, its analog voltage output can be converted into an accurate current measurement.
| IC Part Number |
Range |
Supply Voltage |
Sensitivity @ 5V |
Zero Point @ 5V |
Size |
| CT220BMV-HS5 |
±1.5 mT (bidirectional) |
2.7 V to 5.5 V |
1500 mV/mT |
2.5 V |
0.4″×0.62″ |
This board is a simple carrier of Allegro’s CT220RMV-HS5 TMR-based, contactless current sensor, which measures the magnetic field of the current flowing through a nearby conductor without needing to be connected in series with the circuit. With calibration, its analog voltage output can be converted into an accurate current measurement.
| IC Part Number |
Range |
Supply Voltage |
Sensitivity @ 5V |
Zero Point @ 5V |
Size |
| CT220RMV-HS5 |
±15 mT (bidirectional) |
2.7 V to 5.5 V |
150 mV/mT |
2.5 V |
0.4″×0.62″ |
