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

UM-0018-M Ultra Miniature Reed Switch Drawing
UM-0018-M Cropped reed switch UM-0018-M SMD reed switch UM-0018-M Vertical Mount reed switch UM-0018-M horizontal mount formed reed switch

Click thumbnails to view actuating distances.


Glass length configurable 5.0 mm  Glass sealed on round portion of wire for high seal strength  Flattened leads oriented to contact Sputtered Ruthenium contact  RoHS Compliant and Lead-free  Not Sensitive to ESD  7-20 Operate AT band


These highly sensitive, Form A type, Ultra miniature reed switches are designed for low power, high speed switching applications. The 5 mm glass version is built for use in very compact applications. The flattened leads are useful for orienting all reed switches in a batch, in one way, while soldering, welding etc., for maximum in-group sensitivity. The 5.0mm glass version can be molded with a 0.25 mm wall around the glass capsule for use in hazardous industrial environments to withstand higher shock and vibration. This reed switch is completely Lead-free and conforms to the RoHS directive.


This reed switch is suitable for use in the following applications and in many others: dentists drills, reed relays, pacemakers and defibrillators, nerve stimulators, spirometers, lightsaberspower showers, automobile crash sensors, vane sensors, LEGO sensors, musical greeting cards, key in ignition detection, feeding tubes


Operate Range AT 7-20
Release Range AT 3-18
Contact Rating (max) W/VA 5.0
Switching Current (max) A 0.35
Carry Current (max) A 0.5
DC Switching Voltage (max) VDC 100
AC Switching Voltage (max) VAC 70
Breakdown Voltage (min) VDC 150
Contact Resistance (max) 200
Insulation Resistance (min) Ω 109
Capacitance (min) pF 0.2


Operate Time (max) ms 0.35
Bounce Time (max) ms 0.3
Release Time (max) ms 0.1
Resonance Frequency Hz >2000
Operating Frequency Hz 500
Operating Temperature °C -40 to +120
Shock Resistance (½Sin wave for 11ms) G 30
Vibration Resistance (10-2000Hz) G 20
Test Coil Code 717 102 003

Ordering Code

UM-0018-M-(Start Operate AT)-(Finish Operate AT)-(Lead Formation code)

Cropped SMD Vertical Mount Horizontal Mount

The cropped version is suitable for 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 mounting on through hole PCBs. Information on tolerances for these lead formations can be found here.
UM-0018-M-7-12 denotes 7-12 Operate AT with unmodified leads
UM-0018-M-15-18-S denotes 15-18 Operate AT band with SMD formed leads

Other Special Configurations Available

Lower Static Contact Resistance
Dynamic Contact Resistance Limit
Higher Insulation Resistance
Special Release Limits
Gold plated leads

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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