IoT proximity sensing with Littelfuse's compact D-shaped reed sensor

24th October 2023
Paige West

Littelfuse, Inc. has unveiled its latest innovation – the 59001 Reed Sensor. This miniature D-shaped cylindrical reed sensor offers compact dimensions, high performance, and customisation possibilities, rendering it a compelling choice for a wide array of industrial, appliance, and IoT proximity sensing applications.

At the heart of the 59001 Reed Sensor's appeal lies its compact size, measuring a mere 13.5 x 5.0 x 4.6mm (0.591 x 0.197 x 0.181"). This diminutive form factor translates into significant space savings, positioning it as the ideal solution for applications where spatial constraints are a critical consideration. Furthermore, its D-shaped design introduces a ‘poka-yoke’ mechanism, simplifying installation and ensuring proper sensor orientation within the assembly.

The 59001 Reed Sensor is ideally suited for a diverse range of markets, including:

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

Its non-contact switching solution makes it especially well-suited for use in wet and challenging environments, guaranteeing consistent performance even under adverse conditions.

Julius Venckus, Global Product Manager at Littelfuse, expressed enthusiasm about the introduction of the 59001 Reed Sensor, stating: "We are delighted to introduce the 59001 Reed Sensor to our valued customers. By carefully addressing the design challenges and limitations inherent in size-restricted applications, we have developed a reed sensor with a shape-oriented and compact form factor tailored to these specific needs. This addition to our reed sensor lineup enhances our ability to offer a comprehensive range of magnetic sensing solutions to meet our customers' diverse requirements."

Key features and benefits:

  • Compact size: measuring only 13.5 x 5.0 x 4.6mm, this design delivers space-saving advantages, facilitating easy installation and correct sensor alignment during assembly
  • High performance: despite its modest size, it can handle switching up to 120 Vac/170 Vdc at 10 W, showcasing its switching capability
  • Versatility: Multiple sensitivity and cable length options are available, accommodating various application demands
  • Durability: engineered to withstand higher operating temperatures, vibrations, and shocks, it surpasses comparable solutions in terms of robustness
  • Environmental compatibility: well-suited for wet and challenging environments, it serves as an efficient non-contact switching solution
  • Customisability: users can benefit from customisation options, emphasizing flexibility


The 59001 Reed Sensors are accessible in various sensitivity and cable length configurations. Sample requests can be made through authorised Littelfuse distributors worldwide.

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