Biased Reed sensors are magnetic sensors commonly used in special  applications due to their Normally Closed and Bistable forms. Biased SMD reed sensors, in particular, are designed to provide enhanced functionality in various demanding environments where standard normally open forms don't function.

These sensors consist of a hermetically sealed glass reed switch, which is baisded with an inbuilt magnet. Unlike other types of reed sensors, biased SMD reed sensors are made using surface mount technology (SMT), allowing for easy integration into various electronic circuits and systems.

One notable feature of biased SMD reed sensors is that they provide a constant magnetic field that biases the reed switch in a specific state. This biasing effect ensures that the reed switch remains in a particular position even in the absence of an external magnetic field, making these sensors ideal for applications requiring a default state.

These sensors offer high sensitivity and fast response times, thanks to their low contact resistance and low hysteresis design. This makes them suitable for detecting and monitoring the presence or absence of opposing magnetic fields with high precision espcially in vane applications.

Biased SMD reed sensors are highly durable and reliable, with a long mechanical and electrical life. They can withstand a wide temperature range and are resistant to shock and vibration, making them suitable for use in harsh environments.

Applications of biased SMD reed sensors are widespread, including proximity-sensing systems, security systems, medical devices, automotive applications, and industrial automation. Their compact size and compatibility with SMT assembly processes make them versatile for use in various electronic devices and equipment.

The magnet strength and the Operate AT band are carefully selected and matched together and over molded. The final magnetic sensitivity of the Latching or Normally closed actuation is then calibrated with special equipment.

Biased sensors are polarity sensitive, capable of switching 10 W at 0.5 A, and can be actuated with a magnet having opposite polarity. Complete drawings, electrical and miscellaneous specifications, actuation distances, usage notes and Applications are listed.

In conclusion, biased SMD reed sensors are powerful magnetic sensors that provide reliable and sensitive detection in challenging environments. With their high sensitivity, fast response times, and durable construction, these sensors are a popular choice for a wide range of industries and applications.