Littelfuse D-Shaped Cylindrical Reed Sensor Delivers Compact, Design Flexibility Solution for IoT Proximity Sensing Applications


Littelfuse, Inc. (NASDAQ: LFUS), an industrial technology manufacturing company empowering a sustainable, connected, and safer world, announced the release of its latest innovative product, the 59001 Reed Sensor. This miniature D-shaped cylindrical reed sensor offers a combination of compact size, high performance, and customization options, making it an ideal choice for various industrial, appliances, and IoT proximity sensing applications.

The key differentiator of the 59001 Reed Sensor lies in its compact size, measuring just 13.5 mm x 5.0 mm x 4.6 mm (0.591″ x 0.197″ x 0.181″). Its small form factor allows for significant space savings, making it ideal for applications where size constraints are a concern. Additionally, its D-shape provides a “poka-yoke” mechanism that simplifies installation, ensuring proper orientation of the sensor in the assembly.

The 59001 Reed Sensor is the ideal choice for a diverse range of markets, including:

  • Small and large appliances,
  • Security and access control,
  • Factory automation,
  • Process equipment, and
  • Proximity and limit sensing applications.

Its non-contact switching solution makes it particularly suitable for wet and harsh environments, ensuring reliable performance even in challenging conditions.

“We are excited to introduce the 59001 Reed Sensor to our customers,” said Julius Venckus, Global Product Manager at Littelfuse. “By understanding the design challenges and constraints of various size-limited applications, we have developed a shape-oriented and smaller-size reed sensor that addresses these specific requirements. This new addition to our reed sensors further enables us to provide the most comprehensive portfolio of magnetic sensing solutions to meet our customers’ needs.”

Features & Benefits:  

  • Compact Size: Measuring just 13.5 mm x 5.0 mm x 4.6 mm, this design offers space-saving benefits, ensuring easy installation and correct sensor orientation during assembly.
  • High Performance: Despite its size, it can switch up to 120 Vac / 170 Vdc at 10 W, showcasing its potent switching capability.
  • Versatility: Available with multiple sensitivity and cable length options, catering to various application needs.
  • Durability: Engineered for higher operating temperatures, vibration, and shock resistance, it surpasses similar market solutions in terms of robustness.
  • Environmental Compatibility: Being a non-contact switching solution, it is aptly suited for wet and harsh environments.
  • Customizable: Flexibility remains at the forefront with customization options available to users.


The 59001 Reed Sensors are available in several sensitivity and cable length configurations. Place sample requests through authorized Littelfuse distributors worldwide. For a listing of Littelfuse distributors, please visit

For More Information
Additional information on the latest series release is available on the 59001 Reed Sensors product page. For technical questions, please contact Julius Venckus, Global Product Manager, EBU at


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