The CH441SR with SOT-23-3L HallSensor ROHS is an electronic part manufactured by Cosemitech. It is a three terminal Hall Sensor with an output voltage proportional to the applied magnetic field. This device was designed to detect and measure magnetic fields in automotive, consumer and industrial applications. The part is RoHS compliant, has a small footprint of 2.9 mm x 2.7 mm and has an operating temperature range between -40°C to 125°C. It is built using a Si-FeMOS process and requires low power to operate. According to Cosemitech, this part is ideal for application such as motor speed detection, current sensing, anti-theft alarms, proximity sensing and power supplies.