Reed Relays and
Electronics India Limited
Manufacturer of Reed Switches, Reed Sensors and Reed-based products
Reed Relays and Electronics India Limited Incorporated in 1971

UM-0018-M Ultra Miniature Reed Switch

This highly sensitive, Form A type, UM-0018-M Ultra Miniature Reed Switches are designed for switching high speed signal loads with an Operate Time of less than 0.3 milliseconds. It can reliably switch loads of up to 5W at 100V. The Leads are flattened and are useful for orienting all reed switches in a batch, in one way if required, for maximum in-group sensitivity. Available with cropped leads for use in smaller plastic housings and can be soldered to cables or used on SMT PCB’s with slots. The SMD version is suitable for reflow soldering on SMT PCBs, and the vertical and horizontal mount versions are suitable for use on through hole PCBs.

  • Drawing of UM-0018-M Ultra Miniature Reed Switch with Full Length Leads
  • Drawing of UM-0018-M Reed Switch with cropped leads
  • Drawing of UM-0018-M with SMD Formed Leads
  • Drawing of UM-0018-M with Formed Leads for Horizontal Mounting
  • Drawing of UM-0018-M with Formed Leads for Vertical Mounting


5.0 mm Glass length. Ruthenium contact. Normally Open. Inert gas filled. 4 types of Lead Formations.



Omni-polar. Does not require power for operation. Sputtered Contact. RoHS Compliant. Not ESD Sensitive.

Cylindrical and Rectangular Magnets

Standard magnets-RRE We offer a range of magnets in different sizes and shapes, specially selected to...Continue reading ->

Actuation Distances for UM-0018-M Reed Switches

UM-0018-M reed switch actuation distance On/Off distances for the 5.0 mm UM-0018-M reed switch having cropped, SMD, Horizontal Mount...Continue reading ->


Contact FormA
Contact Rating (max)W/VA5.0
Switching Current (max)A0.35
Carry Current (max)A0.5
DC Switching Voltage (max)VDC100
Breakdown Voltage (min)VDC150
Contact Resistance (max)200
Insulation Resistance (min)Ω109
Capacitance (typ)pF0.2


Operate Time (max)ms0.35
Bounce Time (max)ms0.3
Release Time (max)ms0.1
Resonance Frequency (typ)Hz>2000
Operating Frequency (max)Hz500
Operating Temperature°C-40 to +120
Shock Resistance (½Sin wave for 11ms)G30
Vibration Resistance (10-2000Hz)G20
Test Coil Number717 102 003

Ordering Code

UM-0018-M-(Operate Band)-(Formation Code)

Operate BandAT7-20
Corresponding Release BandAT3-18
Formation CodeLead Type
Full Length Leads
HHorizontal Mount
VVertical Mount

Examples: UM-0018-M-7-12 denotes 7-12 Operate Band (AT) with Full Length leads. UM-0018-M-15-18-S denotes 15-18 Operate Band (AT) with SMD formed leads.

Other Special Configurations: Lower Static Contact Resistance, Dynamic Contact Resistance Limit, Higher Insulation Resistance, Special Release Limits, Gold plated leads.

Usage Notes

Here are some of the recommended usage notes to ensure maximum durability of this reed swtch. The complete usage notes are available here.

Ampere Turn Selection

Reed Sensor Manufacturer Cross Reference For any application, it is important to select the correct Ampere Turn (AT) or...Continue reading ->

Product Handling

Dropping Reed switch Reed Switches, Reed Sensor and Magnet Sensors are sensitive devices that easily develop micro...Continue reading ->

Manual Soldering

Soldered Reed switch Manual Soldering of reed switch leads may be required when using custom plastic housing...Continue reading ->

Ferro-magnetic parts

Ferromagnetic parts Using Ferro-magnetic mounting parts or screws within a 100 mm vicinity of a reed switch will...Continue reading ->

Potting and Encapsulation

Dispensing unit As some potting compounds cure over 24 hours, the glass seals should be protected....Continue reading ->

Reed Contact Protection Circuits

Inductive Load Protection Circuit When a reed switch is to be connected to an inductive load or a...Continue reading ->


Although we can never restrict the use of a reed switch to a particular field, the following is a list of some of the applications that the UM-0018-M Ultra Miniature Reed Switch is known to perform well.

Reed Switches and Reed Sensors in Capsule Endoscopy

capsule endoscopy Capsule Endoscopy is a new process to circumvent problems of regular endoscopy. It consists...Continue reading ->

Reed switches and Reed Sensors in Portable Defibrillators

Defibrillator Defibrillator and impantable Cardioverter-defibrillators use reed sensors to alter the mode of operation using...Continue reading ->

Reed sensors for detecting Ignition Key

key ignition As long as the ignition key detecting reed sensor is not actuated means that...Continue reading ->

Reed Sensors in Pediatric Feeding tubes

Pediatric feeding tube To know the location of the end of a feeding tube, tiny reed switches...Continue reading ->

Reed Sensors in Electric Car Chargers

E-car charger Electrical cars are designed to have a range of 250-300 kilometers on a full...Continue reading ->

Reed switches in Lightsabers

Reed Switches are used in Lightsabers to for power up only when the owner...Continue reading ->

Reed Switches and Reed sensors in Canal Hearing Aids

Reed sensors in canal hearing aids A tiny reed sensor inside hearing aids help the user adjust volume levels and...Continue reading ->

Magnet sensors in Musical Greeting Cards

Reed switches in musical greeting card Ultra miniature reed switches can be used in electronic greeting cards with magnets to...Continue reading ->

Reed sensors in Notebook computers and PC desktops

Notebook computer In notebook computers the screen is closed to put the system into sleep mode....Continue reading ->

Reed switches and Reed sensors in Spirometers

Spirometer Reed Switches help measure the volume of air intake and the time in a...Continue reading ->

Reed switches in Vagus Nerve Stimulators

Vagus Nerve stimulator Vagus Nerve stimulators are implantable devices which control the stimulation of impulses to control...Continue reading ->

Reed switches and Reed sensors in Pacemakers

pacemaker Mode changing in a pacemaker requires an external wand with an embedded magnet, with...Continue reading ->
UM-0018-M 5W Ultra Miniature Reed Switches
5.0 mm x ø1.80 mm, Flattened leads, complete data sheet and technical specifications. Customers can safely use UM-1018-M in place of RI-80, RD-75AA or HSR-0035R
Brand: RRE
Manufacturer: Reed Relays and Electronics
Model: UM-0018-M
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