MATE-12B Series - Long life > High Reliability > 12.7mm Reed Switch

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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.


The MATE-12B Reed Switch is a sub-miniature, normally open switch with a 12.70 mm long x 1.80 mm diameter (0.500" x 0.071") glass envelope, capable of switching 200 Vdc at 10 W. It has high insulation resistance of 10¹² ohms minimum and low contact resistance of less than 100 milli-ohms.


  • Prolong operating life cycles
  • Hermitically sealed
  • Miniature normally open switch
  • cULus recognition
  • RoHS compliant


  • Extending end product operating life and reliability, ideal for Automatic Test Equipment (ATE)
  • Suitable for various operating environment/application
  • Saves PCB space and reduce overall weight for compact size and light weight end products
  • Facilitates end product meeting/passing cULus test/request
  • Environment friendly


  • Reed Relay particularly for ATE application that requires long life
  • Appliance applications that require long life and high reliability switch
  • Limit switching

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Access specifications, certifications, check availability and order parts below

Catalog #Switching Power (W)Switching Voltage (V DC)Switching Current (A DC)Breakdown Voltage (V DC)Max Contact Resistance (Ω)Magnetic Sensitivity (AT)Body Length (mm)Overall Length (mm)Switch TypeOperating TemperaturePartner ECAD ModelsStockSamplesCompare
MATE-12B-10-15102000.52500.110 to 1512.712.7A:SPST-NO-40° to 125°CMATE-12B-10-15CheckOrder
MATE-12B-12-18102000.52500.112 to 1812.712.7A:SPST-NO-40° to 125°CMATE-12B-12-18CheckOrder
MATE-12B-15-20102000.52500.115 to 2012.712.7A:SPST-NO-40° to 125°CMATE-12B-15-20CheckOrder
MATE-12B-17-23102000.52500.117 to 2312.712.7A:SPST-NO-40° to 125°CMATE-12B-17-23CheckOrder
MATE-12B-20-25102000.52500.120 to 2512.712.7A:SPST-NO-40° to 125°CMATE-12B-20-25CheckOrder
MATE-12B-8-13102000.52500.18 to 1312.712.7A:SPST-NO-40° to 125°CMATE-12B-8-13CheckOrder
To request product environmental information, please complete the Product Environmental Information Request Form.