MDSM-4B-12-18 - MDSM-4 Series

Series: MDSM-4
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Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

A sub-miniature, surface mount, normally open switch with a 15.24mm long x 2.28mm diameter (0.600" x 0.090") glass envelope. Capable of switching 200Vdc at 10W. Available sensitivity range of 12-38 AT. High insulation resistance of 1010 ohms minimum and contact resistance of less than 100 milliohms. Available in axial-leaded version (MDCG-4). Ideally suited for reed relays, security, metering, limit sensing, telecom and office equipment applications. Available in bulk packaging or tape and reel.

Features:

  • Surface mount, normally open switch capable of switching 200Vdc or 0.5A at up to 10 Watts
  • Available sensitivity range of 12-38 AT

Benefits:

  • Hermetically sealed switch contacts are not affected by and have no effect on their external environment
  • Zero operating power required for contact closure
  • Excellent for switching micro-controller logic level loads

Applications:

  • Position sensing
  • Level sensing
  • Security
  • Industrial controls
  • Telecom
  • Office equipment
  • Home appliances
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Application Spotlight


Property (Mouseover for details) Value
Switching Power (W) 10
Switching Voltage (V DC) 200
Switching Current (A DC) 0.5
Breakdown Voltage (V DC) 250
Max Contact Resistance (Ω) 0.1
Magnetic Sensitivity (AT) 12 to 18
Body Length (mm) 15.24
Overall Length (mm) 19.3
Switch Type A:SPST-NO
Switching Voltage (V AC) 140
Switching Current (A AC) 0.35
Max Operate Time (ms) 0.6
Max Release Time (ms) 0.2
Resonant Frequency (kHz) 3.9
Partner ECAD Models MDSM-4B-12-18
Operating Temperature -40° to 125°C

URicon UR_NWFW2_E471070

CRUicon CUR_NQMJ8_E471070

pdficon Reed Switch Selection Guide

A quick reference guide to selecting reed switches for electronic applications
pdficon Littelfuse Reed Switches MDSM-4 datasheet

pdficon Soldering Temperatures Application Note

This application note applies to all of Littelfuse?s products that are normally soldered to printed circuit boards (PCBs) including all reed switches.
pdficon Extreme Temperature Reed Switch Operation Application Note

Littelfuse reed switches are normally specified to operate in a temperature range of -40 ?C to +125 ?C. T
pdficon Catalog Glossary Reed Switch Terms Application Note

Reed Switch Terms Glossary
pdficon Ampere turn versus mT and Gauss Application Note

What is the relationship between AT (Ampere*turn) and Tesla or Gauss? What magnet strength will activate a 15 AT reed switch at 5 mm?
pdficon Storage of Littelfuse Sensor Parts Application Note

The data sheets for Littelfuse parts show temperature ranges for storage. However long term exposure to extreme temperatures in the specified storage temperature range may degrade solderability of terminals.
pdficon Handling of Reed Sensors Relays And Switches Application Note

When used within their capabilities Littelfuse reed sensors reed relays and reed switches provide many years of robust performance
pdficon Measuring Reed Switch Sensitivity and Contact Resistance Application Note

The purpose of this application note is to document the preferred method of reading the sensitivity and contact resistance of Littelfuse reed switches.
pdficon Modifying Reed Switches Application Note

When cutting and forming reed switch leads it is important to use the correct support and cutting tools to avoid causing damage to the glass-to-metal hermetic seals.
cURicon cUR_NRNT8_E47258_100213433

URicon UR_NRNT2_E47258_100213433

pdficon Position and Level Sensing in Washing Machines

A most integral appliance in any home is a washing machine. Washing machines have helped made the chore of cleaning clothes quite effortless.
pdficon Reed Switch and Reed Sensor Activation Application Note

Although a reed switch can be activated by placing it inside an electrical coil many reed switches and reed sensors are used for proximity sensing and are activated by a magnet.
pdficon Inductive Load Arc Suppression Application Note

When a reed switch or reed sensor is used to control an inductive device (relay coil solenoid transformer small motor etc.)
pdficon Vibration Testing and Precautions Application Note

Littelfuse tests sinusoidal vibration according to Mil. Std. 202G Method 204D Test Condition G (10 ? 2000 Hz frequency sweep at 30 G or 0.06 inch double amplitude whichever is less).
pdficon Capacitive Loads Application Note

When there is significant capacitance in a reed sensor reed relay or reed switch circuit the peak current and energy switched by the reed contacts should be considered.
pdficon Reed Switch Extended Shock Capabilities Application Note

The maximum shock specifications in the Littelfuse catalog are very conservative for most switches smaller than the DRxxxx type. T
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pdficon Flow Sensing in Tankless Water Heaters Application Note

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Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s) IPC-Material Declaration
MDSM-4B-12-18 MDSM-4B 5276 12-18 RoHS No 12/15/2017 PbFree No 12/15/2017 CoC_RoHS10_MDSM-4B-12-18 REACH209_Declaration_MDSM-4B-12-18 Yes
12/15/2017		 Does not Contain IPC_MDSM-4
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