
Features Description
• Small size
Easily surface mountable
• Hermetically sealed
• Easily formed leads
Clare’s Ultra-Mini DyadTM is well suited for small, signal 
switching applications. The small size lends itself to surface 
mountable applications; working well on higher density 
PC boards. The Ultra-Mini DyadTM has sputtered ruthenium 
contacts and an extraordinary seal strength achieved by 
a patented laser sealing of the leads. In low level or dry 
switching environments, switches typically exceed 1 billion 
operations.
Applications
• Proximity Sensors
• Relays
• Telecommunications
• Automation control
Ordering Information
A complete part number is represented by the digits to the right. For example, UM2S1030 is 
an ULTRA-MINI DYAD™ with a minimum operate value of 10, and a maximum of 30. Refer to 
the switch operating specification charts for available ranges. Special ranges are available 
upon request.
• Medical
Ultra-Mini Dyad
 UM2 S XX XX 
™
UM2
Standard Test Coil
UM2
Part # Coil-1
Coil Definition NARM1 CTC01
Coil Resistance 1200Ω
Number of Turns 5,000
Wire Size 0.0399mm (AWG 46)
Bobbin Diameter (inside cell) 3.96mm
Winding Length 10.4mm
Minimum Operate Value (NI)
Surface Mount Ultra-Mini Dyad 
Refer to operating characteristics table for complete part number.
Maximum Operate Value (NI)
Ultra-Mini DYAD™
Part # Operate Range (NI)
UM2S1015 10 to 15
UM2S1020 10 to 20
UM2S1030 10 to 30
UM2S1520 15 to 20
UM2S1525 15 to 25
UM2S2025 20 to 25
1
Ultra-Mini DYAD™ Surface Mount
Part # Operate Range (NI)
UM2319 10 to 15
UM2315 10 to 20
UM2376 10 to 30
UM2325 15 to 20
UM2341 15 to 25
UM2378 20 to 25
1
 Tolerance = ± 1.5NI
2
 Full Blade Sensitivity
3 
Surface Mount Switches are packaged 3,000 parts per reel
1,2,3
DS-UM2-R2
www.clare.com
1

Ultra-Mini Dyad
UM2
™
Ratings (@ 25˚ C)
Parameter Min Typ Max Units
Absolute Maximum Ratings are stress ratings. Stresses 
in excess of these ratings can cause permanent damage 
to the device. Functional operation of the device at these
Switching Voltage — — 175 Volts 
Switching Current — — 0.25 Amps 
Carry Current — — 0.50 Amps 
Switching Fequency — 500 — Hz 
Contact Resistance — — 300 mΩ
1
 Derate Linearly 1.33 mw / oC
2
 Derate Linearly 3.67 mw / oC
or any other conditions beyond those indicated in the 
operational sections of this data sheet is not implied. 
Exposure of the device to the absolute maximum ratings 
for extended period may degrade the device and effect 
its reliability.
Specifications
PARAMETER CONDITIONS SYMBOL MIN TYP MAX UNITS
Contact Ratings
Switching Voltage Max DC/Peak AC Resist VL - - 175 Volts 
Switching Current Max DC/Peak AC Resist IL - - 0.25 Amps 
Carry Current Max DC/Peak AC Resist IC - - 0.50 Amps 
Contact Rating Max DC/Peak AC Resist - - - 5 VAs 
Static Contact Resistance 100mV, 20mA CR - .120 0.30 Ω 
Contact Material - - Ru - -
Electrical Ratings
Operate Sensitivity Full Blade Tolerance = ±1.5 NI - 10 - 30 NI 
Release Sensitivity Full Blade Tolerance = ±1.5 NI - 5 - 30 NI 
Insulation Resistance Between all isolated pins at 100V, IR  10
25˚C, 40%RH 
Capacitance Across Open Contacts - - 0.3 - pF 
Dielectric Strength Between Contacts - 200 - - VDC/peak AC 
Operate Time, At Nominal coil voltage, TOP - 0.4 - msec.
including bounce 30 Hz Square Wave
Release Time Zener-Diode Suppression TREL - 0.1 - msec.
Environmental Ratings
Operating Temperature TO -40 - 125 ˚C 
Storage Temperature TA -40 - 125 ˚C 
Soldering Temperature - - - 260 ˚C 
Vibration Resistance 10Hz-1000Hz G - - 20 Gs
1
Shock Resistance 11±1ms, 
/2 Sine Wave S - - 30 Gs
9
10
11
-W
2
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Rev. 2

Worldwide Sales Offices
CLARE LOCATIONS
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Beverly, MA 01915 
Tel: 1-978-524-6700 
Fax: 1-978-524-4900 
Toll Free: 1-800-27-CLARE
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St. Louis, MO 63045 
Tel: 1-314-770-1832 
Fax: 1-314-770-1812
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AMERICAS
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Lead Rep 
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91160 Champlan 
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http://www.clare.com
Clare cannot assume responsibility for use of any circuitry other 
than circuitry entirely embodied in this Clare product. No circuit 
patent licenses nor indemnity are expressed or implied. Clare reserves the right to change the specification and circuitry, without 
notice at any time. The products described in this document are not 
intended for use in medical implantation or other direct life support 
applications where malfunction may result in direct physical harm, 
injury or death to a person.
Canada
Clare Canada Ltd. 
3425 Harvester Road, Suite 202 
Burlington, Ontario L7N 3N1 
Tel: 1-905-333-9066 
Fax: 1-905-333-1824
Specification: PB-UM2-R2 
©Copyright 2000, Clare, Inc. 
Ultra-Mini Dyad™, Mini Dyad™, and Dyad® are 
trademarks of Clare, Inc. 
All rights reserved. Printed in USA. 
3/7/01