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Sensors Products Catalog

Sensors Products Catalog

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About This Guide
This guide provides an introduction to magnetic sensing and customization options for reed switches, reed sensors, and Hall effect sensors. It includes practical advice for selecting these components for various applications.

Introduction to Magnetic Sensing
Magnetic sensing utilizes reed switches and Hall effect sensors. Reed switches are non-contact elements with zero power consumption, while Hall effect sensors offer high-frequency operation and digital switching capabilities.

Value-Added Customization
Littelfuse offers custom sensor designs, vertically integrated manufacturing, and quick prototype turnaround. They provide magnetic simulation support and a comprehensive range of sensor options to meet specific customer needs.

Reed Switches
Reed switches consist of ferromagnetic blades in a sealed glass envelope, activated by a magnetic field. They are sensitive to magnetic fields, measured in ampere-turns (AT), and are used in various applications due to their reliability and efficiency.

Reed Sensors
Reed sensors are reed switches in protective housings, offering resistance to environmental influences and mechanical stress. They are suitable for applications like door security sensors.

Reed Relays
Reed relays combine a reed switch with a copper coil, providing galvanic isolation and requiring lower power to drive the coil. They are used in automotive, medical, and process control equipment.

Hall Effect Sensors
Hall effect sensors are semiconductor-based devices that respond to magnetic fields, providing digital or analog outputs for proximity and positioning applications. They contain active circuitry and are available in programmable versions.

Magnetic Actuators
Littelfuse offers a range of magnetic actuators and bare magnets in various materials, suitable for different applications.

Comparing Reed vs. Hall Effect
Both technologies offer advantages for different applications. Reed switches are non-contact and consume no power, while Hall effect sensors provide high-frequency operation and digital switching.

Customization and Engineering Services
Littelfuse offers modifications to standard products and fully custom sensor designs. They provide 3D CAD design, electronic circuitry design, magnetic simulation, and rapid prototyping services.

Applications
Littelfuse sensors are used in proximity, level, speed, and flow applications. Customizations, including connectors and wire lengths, are available for all standard products.

Product Specifications and Descriptions
Reed Relays: Available in Dual-In-Line (DIL) and Single-In-Line (SIL) packages for mounting on printed circuit boards, used for high voltage applications with specific dimensions, coil voltages, and contact ratings.
Magnetic Actuators: Include rectangular and cylindrical magnets made from materials like AlNiCo and Neodymium, suitable for high-temperature applications and various mounting configurations.

Applications and Use Cases
Proximity Sensing: Reed sensors are used in appliances like refrigerators to detect door positions, offering benefits like no physical contact, zero power requirement, and protection against environmental factors.
Speed Sensing: Reed and Hall effect sensors are used in treadmills and washing machines to measure speed and direction, providing reliable and accurate sensing.
Security and Alarm Systems: Reed switches are used in door and window alarms, offering features like no physical contact, zero power requirement, and environmental protection.

Key Features and Benefits
Reed sensors and Hall effect sensors provide non-contact operation, reliability, and are cost-effective alternatives to mechanical switches. They are suitable for a wide range of temperatures and environments, offering long lifetimes and reliable operation.

Suggested Products
Various models of reed switches and Hall effect sensors are recommended for specific applications, such as the FLEX-14, MDCG-4, and 59025 for proximity sensing, and the 55140 and 55310 for speed sensing.

Overview
The document provides detailed information on various types of mechanical switches, particularly reed switches, and their applications in different industries. It highlights the features, benefits, and suggested products for specific applications such as level sensing and flow switching.

Mechanical Switches
The document lists several types of reed switches including MDSM-10, 59020, 59040, 59140, 59170, and HE3621A0510. These switches are used in applications like burglar systems, smoke alarms, and gas detection systems.

Level Sensing Applications
Reed switches are used in resistive reed ladder networks to measure liquid levels in tanks, providing continuous output signals. These sensors are used in automotive, marine, and industrial markets. Key features include hermetically sealed capsules, protection against mechanical stresses, and reliable switching operations.

Dishwasher Water Level Sensing
Reed sensors are used in dishwashers to detect water levels. The float sensor consists of a reed switch and a magnet within a float housing. This setup provides a low-cost solution for detecting liquid levels in appliances.

Flow Switch Applications
Reed switches detect the motion of valves or pistons in flow sensors, commonly used in tankless water heaters. These sensors require no physical contact or power for actuation and are protected against environmental factors.

Circuit Protection Solutions
Littelfuse offers a broad portfolio of circuit protection solutions including fuses, TVS diodes, and varistors. These products enhance safety and reliability in load-switching applications. Recommendations for inductive and capacitive load switching are provided.

Global Presence
Littelfuse emphasizes its global footprint and expertise in developing innovative circuit protection, power control, and sensing solutions. The company aims to meet customer needs through its extensive product portfolio and global manufacturing and R&D teams.

Catalog excerpts

PRODUCT CATALOG & DESIGN GUIDE Proximity | Level | Speed | Flow

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Expertise Applied | Answers Delivered About This Guide This guide provides an introduction to magnetic sensing and options for value-added custom design packages. It also offers practical suggestions for selecting reed switches, reed sensors and Hall effect sensors for a variety of applications. © 2017 Littelfuse, Inc. • Specifications are subject to change without notice

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WHY CHOOSE LITTELFUSE Founded in 1927, Littelfuse has become the world’s most respected circuit protection brand with well-established and growing platforms in power control and sensing technologies. Today, we are a global company, offering the industry’s most diverse and extensive product portfolio—fuses, semiconductors, polymers, ceramics, relays, sensors and more—serving the electronics, automotive and industrial markets. Each is manufactured to exacting quality standards and backed by an unwavering commitment to technical support and customer service. 59135 (High-Temperature Flange Mount...

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M Littelfuse' Expertise Applied | Answers Delivered INTRODUCTION TO MAGNETIC SENSING REED SWITCHES A reed switch has two ferromagnetic blades (reeds) contained within a tubular glass envelope that is hermetically sealed at each end. The contacts on each reed blade have a thin layer of precious metal material deposited on them. There is usually nitrogen gas on the inside of the glass envelope to eliminate the preslncelof oxygen and ensmre tsat the contacts will not oxidize. Reed switches are activated by a permanent magnet or an electromagnet. The reed switch and magnetic field combination is...

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CUSTOMIZABLE OPTIONS TYPES OF CUSTOMIZATION Modifications are available to existing standard product packages, such as adding connectors or changing wire size or length, as well as offering special reed switch sensitivities, custom lead forming and bending or modifications to bare reed switches. Fully new custom sensor package designs and/or circuitry Magnetic circuit (actuator magnet and sensor) design for a variety of applications See our full range of sensor manufacturing process capabilities ENGINEERING SERVICES OFFERED: 3D CAD mechanical design services Electronic circuitry design Magnetic...

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Expertise Applied | Answers Delivered MDSM-10 Body Length Lead-Lead Length Power Size Terminals Switch Type Package Product Series (mm)/[Inch] (mm)/[Inch] Notes: For details on electrical specifications, visit littelfuse.com A:SPST-NO - Single Pole Single Throw - Normally Open C:SPDT-CO - Single Pole Double Throw - Change Over All reed switches are RoHS compliant Certification: Contact Littelfuse for certified ratings **Breakdown Voltage - per MIL-STD-202, Method 301 f20 W for 100-265 VAC loads, 10 W for all other loads © 2017 Littelfuse, Inc. • Specifications are subject to change without notice...

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REED SWITCHES Littelfuse* Expertise Applied | Answers Delivered ation* Switching Power (W) Lead Modifications Littelfuse can cut and/or form the reed switch leads to meet your dimensional requirements. Most lead modifications can be done by Littelfuse without any additional tooling costs. Applications Assistance and Custom Switch Modification Littelfuse offers complete application engineering assistance in selecting the correct switch, sensitivity, and configuration. Switch life is affected by electrical load and other operating conditions. Littelfuse offers load/life information per customer...

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Expertise Applied | Answers Delivered Sensors, Reed Relays and Magnetic Actuators Our sensor technologies are ideally suited for various sensing applications, including proximity, level, speed and flow, as shown in the table. Customizations, including various connectors and wire lengths, are available for all our standard products. For more detailed product specifications and all available options, refer to the individual product datasheets. Littelfuse.com 7 © 2017 Littelfuse, Inc. • Specifications are

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HALL EFFECT SENSORS Littelfuse* Expertise Applied | Answers Delivered FLAT PACK This sensor's rectangular package is ideally suited for mounting on a flat surface. It is designed for use in a wide range of environments. Product Series 55075 Stainless Steel M12 Geartooth Hall M12 x 1 Pitch x 46.00 (1.811) 4.75 to 25.2 N/A Digital Vdd - 2 0.6 V @ 20 mA -40 to +85 -65 to +85 © 2017 Littelfuse, Inc. • Specifications are subject to change without notice

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Expertise Applied | Answers Delivered This sensor offers a slim, cylindrical package that is suitable for mounting on a frame. Mating Actuator Contact Switching Breakdown Rating Voltage Voltage Product Series Overall Dimensions mm (inch) 0 x L Contact Resistance, Initial Ohms Max. © 2017 Littelfuse, Inc. • Specifications are subject to change without notice

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REED SENSORS Littelfuse* Expertise Applied | Answers Delivered THREADED BARREL Designed with a cylindrical package, this sensor is available with English and metric threads. It may easily be mounted and adjusted using the supplied retaining nuts. © 2017 Littelfuse, Inc. • Specifications are subject to change without notice

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Expertise Applied | Answers Delivered DUAL-IN-LINE (DIL) Reed relay products are available in standard dual-in-line packages for mounting on a printed circuit board or socket. © 2017 Littelfuse, Inc. • Specifications are subject to change without notice

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MAGNETIC ACTUATORS Littelfuse* Expertise Applied | Answers Delivered RECTANGULAR These rectangular bare magnets and packaged actuators are ideally suited for mounting on a flat surface.They are suitable for use in a wide range of environments, including high-temperature applications. Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at www.littelfuse.com/disclaimer-electronics....

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Sensors Products Catalog

Sensors Products Catalog

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