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MK31 Series Reed Sensor


Ultraminiature surface mount (SMD) MK31 Series Reed Sensor used in On/Off control switch, proximity, motion, position detection. Supplied in tape and reel according to IEC 286/part 3. J-lead design. UL Approval


Contact Form1A (SPST) Normally Open (N.O.)
Operating Range5-30 AT
Rated Power Max.3W/30VDC/0.3A


Portable medical device, security, telecommunications, white goods

Series Data Sheet (PDF)

Stock Check

Item No.DatasheetDistributorRegionQuantityCartRFQInventory Date
MK31-B-3 Electro Sonic GroupAmericas2,000 BUY RFQ2024-07-19
MK31-B-3 Heilind ElectronicsAmericas0 RFQ2024-07-19
MK31-B-3 Digi-Key ElectronicsAmericas0 RFQ2024-07-18
MK31-B-3 Digi-Key ElectronicsAmericas689 BUY RFQ2024-07-18
MK31-B-3 Digi-Key ElectronicsAmericas689 BUY RFQ2024-07-18
MK31-B-3 MASTER/ONLINEAmericas2,000 BUY RFQ2024-07-19
MK31Standex FactoryAmericas0 RFQ2024-07-19
MK31-B-3 Mouser ElectronicsAmericas3,113 BUY RFQ2024-07-19
MK31-B-2 Arrow ElectronicsAmericas0 RFQ2024-07-19
MK31-B-3 TTI Inc Global HeadquartersAmericas0 RFQ2024-07-19
MK31-B-2 TTI Inc Global HeadquartersAmericas0 RFQ2024-07-19

Parametric Search

Mounting StyleContact ConfigurationOperate RangeContact RatingSwitching VoltageSwitching CurrentLength OverallSize BodyTermination
Part NumberMounting StyleContact ConfigurationOperate RangeContact RatingSwitching VoltageSwitching CurrentLength OverallSize BodyTerminationPackaging
MK31-B-2SMD - Molded BodySPST-NO3 W30 V0.3 A0.337" (8.55mm)0.252" L x 0.087" W x 0.071" H (6.40mm x 2.20mm x 1.80mm)Gull Wing ShortTape & Reel
MK31-B-3SMD - Molded BodySPST-NO35 ~ 87 AT3 W30 V0.3 A0.272" (6.90mm)0.252" L x 0.087" W x 0.071" H (6.40mm x 2.20mm x 1.80mm)J BendTape & Reel

Associated Parts

Ultraminiature surface mount (SMD) MK24 series reed sensor used in On/Off control switch, proximity, motion, position detection with optional Form B (SPST-N.C.) contact form. Supplied in tape and reel according to IEC 286/part 3. Axial or gull-wing lead designs available. UL Approval

UL Certificate of Compliance

Ultraminiature surface mount (SMD) MK17 Series Reed Sensor used in On/Off control switch, proximity, motion, position detection. Supplied in tape and reel according to IEC 286/part 3. Axial, gull-wing or J-lead designs available. UL Approval

UL Certificate of Compliance (MKxxU *Series followed by U)

Miniature surface mount (SMD) MK22 Series Reed Sensor used in On/Off control switch, proximity, motion, position detection. Supplied in tape and reel according to IEC 286/part 3. Axial or gull-wing lead designs available. UL Approval

UL Certificate of Compliance

Miniature surface mount (SMD) MK16 Series Reed Sensor used in On/Off control switch, proximity, motion, position detection. Supplied in tape and reel according to IEC 286/part 3. Axial or gull-wing lead designs available. UL Approval

UL Certificate of Compliance (MKxxU *Series followed by U)

Technical Papers

Datasheet – MK33 Series Reed SwitchesDatasheet – MK21PR Series Reed SensorsDatasheet – MK04R Series Reed SensorsDatasheet – MK31 Series Reed SensorsDatasheet – MK10 Series Reed SensorsDatasheet – Magnet in Housing – M02, M03, M04, M05, M06, M11, M12, M13 and M21Datasheet – MK21 Series Reed SensorDatasheet – M21P Series Magnet in HousingDatasheet – M13 Series Magnet in HousingDatasheet – M11B Series Magnet in HousingDatasheet – M02 Series Magnet in HousingDatasheet – MK25 Series Reed SensorDatasheet – MK08 Series Reed SensorDatasheet – MK07 Series Reed SensorDatasheet – MK11 Brass Series Reed SensorDatasheet – MK11 Plastic Series Reed SensorDatasheet – MK11 Stainless Steel Series Reed SensorDatasheet – MK03 Series Reed SensorDatasheet – MK14 Series Reed SensorDatasheet – MK18 Series Reed SensorDatasheet – MK20/1 Series Reed SensorDatasheet – MK20/2 Series Reed SensorDatasheet – MK27 Series Reed SensorDatasheet – MK26 Series Reed SensorDatasheet – MK13 Series Reed SensorDatasheet – MK05 Series Reed SensorDatasheet – MK04 Series Reed SensorDatasheet – MK28 Series Reed SensorDatasheet – MK02 Series Reed SensorDatasheet – MK02/6 Series Reed SensorDatasheet – MK06 Series Reed SensorDatasheet – MK30 Series Reed SensorDatasheet – MK01 Series Reed SensorDatasheet – MK15 Series Reed SensorDatasheet – MK22 Series Reed SensorDatasheet – MK16 Series Reed SensorDatasheet – MK17 Series Reed SensorDatasheet – MK10 Series Reed SensorDatasheet – MK23 Series Reed SensorDatasheet – MK24 Series Reed Sensor



Standex Electronics Japan | Company Video

Standex Electronics Japan is a worldwide market leader in the design, development, and manufacturing of magnetic reed switches. Headquartered in Kofu City, Japan it was previously branded as the OKI Sensor Device Corporation prior to being acquired by Standex Electronics, Inc., a division of Standex International. The new name of OKI Reed Switches is KOFU, A Standex Electronics Brand.

Reed Switches for Smart Home Automation Systems

Reed Switches work well with smart home automation systems because they draw no power compared to other magnetic sensing elements. They can be married to a wireless or Bluetooth technology and placed in remote battery powered door sensors or window sensors, or anything where you’re looking for movement or proximity. They’re a very cost-effective and robust component suitable for the home environment, requiring fewer connections resulting in longer battery life.

In today’s homes and also commercial properties, there’s an increased necessity for control to improve efficiency and productivity. And with that control, you have different products that measure temperature, water levels, security, and locks, so within those products reed switches play a major role in making them “smart”.

Standex Electronics is a global leader in the design, development, and manufacturing of standard and custom Reed Switches.

Product Training Module – Magnet Technology & Their Uses

Welcome to Standex Electronics where we will be exploring what magnets are and how they are used in the electronic industry. We will define the key terms relating to magnets and we will explore what magnets are, what they do, and how they are used.

Product Training Module – Magnetic Mapping

Welcome to Standex Electronics' presentation on magnetic mapping and how it can help the reed sensor designer.

Product Training Module – Liquid Level Sensing Technology

Welcome to Standex Electronics' presentation on the Liquid level sensing technology. We will present and define the liquid level sensing technology. We will also present the key functions and define all critical terms. Along with this we will investigate the various package configurations and review the various expanding applications.

Product Training Module – Latching Form B Reed Relays & Sensors

Welcome to Standex Electronics' Latching and Form B Reed Relay and Sensor training module. This module will define key terms of Form B and Latching sensors and relays. The module will also describe the structure and function of latching and Form B reed relays and sensors.

Product Training Module – Reed Sensor vs. Hall & Mechanical

Welcome to Standex Electronics' How to Select the Correct Technology for a Given Sensor Requirement. We will focus on the following sensor technologies - Reed, Hall, and Electromechanical. These sensors all provide a switching function either directly or indirectly. We will introduce the key specifications, and how these parameters compare to each other for the different technologies.

Product Training Module – Automotive Liquid Level Sensing

Welcome to Standex Electronics Electronic's presentation on the exciting dramatic increase in automotive applications using hermetically sealed reed sensors. They are having a significant effect on automotive safety and adding to the overall vehicle intelligence. We will present the reed sensor's technology, how they 'tie into' the applications, and show how they solve the application's problem. We will also present many of the applications and go into detail on some of them.

How a Reed Switch Works

The Reed Switch is the core element in Reed Sensors, Level Sensors and Reed Relays. A magnetic contact switch consisting of two ferromagnetic blades are hermetically sealed inside a glass tube. The glass tube is filled with a high purity inert gas. Under non operating conditions the reed switch contacts do not touch. Standex Electronics is leading the way in reed switch manufacturing...

How Reed Switches are Manufactured

Ultra miniature and high precision Reed Switch manufacturing in the most modern factory of its kind. Standex Electronics micro technology enables the mass production of Reed Switches at the highest quality for competitive pricing. The complete process from the sputtering of the magnetic contacts through the hermetic sealing and final testing...

Reed Switch Technology

Standex Electronics expert discusses reed switch technology and why reed switches play such an important role in many applications.

3D Magnetic Mapping for Sensor Applications

Standex Electronics's technical expert describes their 3D Magnetic Mapping capabilities used in reed sensor applications

Reed Switch SMD Sensor & Magnet Actuation in 3-D

A Reed Switch Sensor on a surface mount PCB assembly shown in 3-D with actuating magnet. When viewed in three dimensions, the magnetic flux lines emanating from the magnet look like a beer barrel keg; and also in three dimensions, with the magnet parallel to the reed switch, the center magnetic lobe array looks like a donut and the two outside lobes look more like a boxer's punching bag -- the kind hung from the ceiling. Essentially the fields from the magnet and the fields for the lobes are symmetrical when viewed in three dimensions. As seen in two dimensions, when the magnet is brought into one of the lobes the reed switch contacts will close. Now, as seen in three dimensions the magnet can be brought into the lobes in any spherical direction for contact closure to occur. Here the magnet is moved into the sphere of influence of the lobes of the reed switch showing the closure and opening when the magnet enters the lobes and passes through them, The change in lighting signifies the closing and opening of the reed switch contacts.

Como se Fabrica un Ampolla Reed (ES)

Construir los interruptores de lengüeta no es ningún trabajo fácil. Ser la fábrica más moderna de su clase en Europa, nuestra producción en Turingia es un mundo de ellos mismos. El tamaño de estos componentes de alta precisión es extremadamente reducido, la capa ultrafina y el trabajo meticuloso se requieren en cada paso de la producción. Esta microtecnología permite la producción en masa de los productos de alta calidad a precios competitivos.

Standex Electronics at AHR Expo 2013

Alex Vinnage talks about what attendees can expect from Standex Electronics at the 2013 AHR Expo.

Linea de Productos Standex Electronics (ES)

Los Interruptores de Lengüeta, Relés de Lengüeta y Sensores de Lengüeta son nuestros productos más importantes. Estos tres grupos tienen una cosa en común: el Interruptor de Lengüeta es el elemento núcleo de todos ellos. Los Interruptores de Lengüeta so dispositivos operados magnéticamente, que han sido inventados por Laboratorios Bell a principios de los años 1940' en Estados Unidos. Funcionan con un principio simple:Dos hojas ferromagnéticas traslapadas de hierro se sellan en un tubo de cristal, separados por una distancia de solamente unos pocos micrones...

Comment fonctionnent les Ampoules Reed (FR)

Les ampoules Reed, les relais Reed et les capteurs Reed sont nos produits les plus importants. Ces trois groupes ont une chose en commun: l'ampoule Reed, « au cœur » de tous ces produits.. Les ampoules Reed sont des appareils activés magnétiquement, qui furent inventés par Bell Labs aux Etats-Unis dans les années 1940. Ils fonctionnent selon un principe simple: Deux lames ferromagnétiques qui se chevauchent , sont scellées dans un tube de verre, séparées par une distance de quelques microns seulement...

Comment sont fabriquées les Ampoules Reed (FR)

Fabriquer des ampoules Reed n'est pas un travail facile. Etant l'usine la plus moderne dans son genre en Europe, notre production de Thuringe est « dans un autre monde » . La taille de ces composants à haute précision est extrêmement petite, l'enduit ultra-mince, un travail méticuleux est exigé dans chaque étape de production. Cette micro technologie permet la production en série de produits de qualité aux prix concurrentiels...

Benvenuti in MEDER (IT)

Molto spesso sono le cose più piccole ad avere l'impatto maggiore nella nostra vita. A volte non le percepiamo neanche, anche se rendono la nostra vita più confortevole e sicura. Sono utilizzate in veicoli, ingegneria della sicurezza, elettrodomestici, dispositivi medici, telecomunicazione e sistemi industriali di ogni tipo. Precisi, affidabili e di lunga durata. Questi interruttori reed, sensori e relè miniaturizzati lavorano instancabilmente secondo la legge di Reed. Anche se a prima vista sembrano semplici, sono in realtà delle vere e proprie meraviglie dell'ingegneria che solo poche aziende al mondo sono in grado di produrre. E noi siamo una di esse: MEDER electronic. Prodotti innovativi per il futuro...

Gamma di prodotti Standex Electronics (IT)

Interruttori reed, relè reed e sensori reed sono i nostri prodotti più importanti. Queste tre categorie di prodotti hanno una cosa in comune: l'ampolla reed, che è il loro elemento centrale. Le Ampolle reed sono dispositivi azionati magneticamente, che furono inventati nei primi anni '40 negli Stati Uniti, nei laboratori Bell. Funzionano secondo un principio molto semplice: due lame di materiale ferromagnetico sono ermeticamente sigillate all'interno di un tubo di vetro...


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