55200-00-00-A
Ratiometric linear Hall effect sensor with analog output. 5V operation, ±10mT range, ideal for current sensing and position measurement.
Product Overview
Description
The Littelfuse 55200-00-00-A is a precision ratiometric linear Hall effect sensor providing analog voltage output proportional to magnetic field strength. With a ±10mT sensing range and high sensitivity, this sensor is ideal for current sensing, position measurement, and proximity applications.
The ratiometric output (0.5V to 4.5V centered at 2.5V) provides excellent noise immunity and is compatible with standard ADC inputs. The device features low noise, high linearity, and temperature compensation for accurate measurements across the operating range.
Operating from a 5V supply and available in a compact SOT-23 package, the 55200-00-00-A is suitable for space-constrained industrial and consumer electronics applications.
Product Series
55200 Series
Primary Application
Current sensing
Key Features
- Ratiometric analog output
- ±10mT linear sensing range
- High 200mV/mT sensitivity
- Low noise and high linearity
- Temperature compensated
- Fast < 5µs response time
- 5V operation
- Compact SOT-23 package
Specifications
| operatingVoltage | 5V ± 10% |
|---|---|
| outputType | Analog (Ratiometric) |
| sensingRange | ±10mT |
| sensitivity | 200mV/mT |
| outputVoltage | 0.5V - 4.5V (±10mT) |
| quiescentOutput | 2.5V (0mT) |
| responseTime | < 5µs |
| operatingTemperature | -40°C to +125°C |
| package | SOT-23 |
Applications
Current sensing
Electronic system design
Position measurement
Data acquisition and conversion
Proximity detection
Electronic system design
Vibration sensing
Electronic system design
Angle sensing
Electronic system design
Force measurement
Data acquisition and conversion
FAE Expert Insights
"The 55200-00-00-A is an excellent analog Hall sensor for applications requiring proportional magnetic field measurement. The ratiometric output is a key advantage - since both the sensor output and your ADC reference come from the same 5V supply, any supply variations cancel out, giving you accurate measurements. I've used this sensor in current sensing applications with excellent results. The ±10mT range is well-suited for measuring currents up to about 50A with appropriate magnetic concentration. The 200mV/mT sensitivity gives good resolution - with a 12-bit ADC, you can resolve about 0.1mT, which translates to about 0.5A current resolution. For thermal performance, the sensor maintains good accuracy across the -40°C to +125°C range thanks to internal compensation. One design tip: keep the sensor away from high-current traces to avoid stray magnetic fields affecting measurements. Use shielding if necessary in noisy environments."
Precision analog Hall sensor with ratiometric output for accurate measurements
— David Wang, BeiLuo
Frequently Asked Questions
How do I use the 55200 for current sensing?
Using the 55200 analog Hall sensor for current sensing: (1) Magnetic Concentrator - Place a ferrite core or magnetic concentrator around the current-carrying conductor to concentrate the magnetic field at the sensor. This increases sensitivity and provides isolation; (2) Air Core - For non-contact sensing, place the sensor near the conductor. Sensitivity depends on distance and current magnitude; (3) Calibration - Measure output at zero current (should be ~2.5V) and at known currents to establish calibration; (4) Calculation - Current = (V_out - 2.5V) / (Sensitivity × Field_per_Amp). For example, with 200mV/mT sensitivity and 0.5mT/A field concentration: Current = (V_out - 2.5V) / 0.1 V/A. Key advantages of Hall effect current sensing: galvanic isolation, no insertion loss, DC and AC measurement capability. For best accuracy, use a magnetic concentrator and keep the sensor temperature stable. The ratiometric output helps compensate for supply variations.
Use magnetic concentrator for best sensitivity and isolation. Calibrate at known currents for accuracy. Contact our FAE team for current sensing design assistance.