ED Domes and EDM Domes
ED
Construction ED EDM
ED, the disc contact is a momentary
Function Momentary Momentary
tact switch with short travel and good
Contact arrangement 1 make contact = SPST 1 make contact=SPST,NO
tactile feedback. Direct mounting on a
Distance between button 12.7 (0.500 ) 12.7 (0.500 ) centers, min.
printed circuit board is possible.
Terminals PC pins or tabs PC pins or tabs
In that case, the dome must be
Electrical data Silver Gold
actuated by a soft actuator of 3.0 mm
(0.118) minimum diameter. The
Switching power max. AC/DC 6 W 3 W 3 W
ED dome is available in various types
Switching voltage max. AC/DC 100 V 100 V 100 V DC
of modules and is the main component
Switching current max. AC/DC 100 mA 50 mA 50 mA
of several switches presented in this Carrying current max. AC/DC 250 mA 250 mA
catalog. Dielectric strength (50 Hz/1 Min.) 300 V 300 V 300 V
6 6
Operating life with max. switching 10 operations 5 10 operations
Self-cleaning system:
power
The contact is made on at least 3 points
Contact resistance 10 m 15 m 15 m
of the lower diaphragm, these 3 points
11 11 11
Insulation resistance (100 V) 10 10 10
of contacts are always different at each
Contact bounce 100 s 100 s 1ms
new switch action. During the switching
movement, the upper disc slides on the
Mechanical data ED EDM
lower diaphragm, ensuring the contacts
Switching travel 0.3 (0.012 ) 0.4 (0.0157 )
self-cleaning.
Max. admissible 0.5 Max. admissible 0.5
(0.02) (0.0197)
EDM
Operating force 2.4N 25% 4.5N (450 grams) 25%
The EDM is available in 4 versions:
(240 grams 25%) 6.5N (650 grams) 25%
EDM 450 AU
EDM 650 AU
Further data
EDM 450 AG
Contact material Silver plated, Gold plated Ag (silver plated)
EDM 650 AG
Au (gold plated)
The EDM Multi Dome Series was
Operating temperature 25C to + 70C -55C to +85C
developed for low prole applications
Storage temperature 40C to + 85C -55C to + 85C
needing increased tactile response
Material housing Thermoplastic
and high performance specications.
contact base Phosphor bronze
plating of contact area 1.5 microns gold (G)
Applications range from aircraft instru-
ment panels to radio keypads. This high
Climatic data
performance dome switch combines our
reliable ED contact system with added Climatic category (days) 10 for silver version
56 for gold version
tactile domes for forces of 4.5N
Soldering by static bath 255C for 5 seconds
(450 grams) and 6.5N (650 grams).
Main features
Gold (Au) or silver (Ag) contacts
Two different operating forces
Low prole
Compact PWB spacing
Proven application in avionics
Ordering code: see next page.
Dimensions are shown in mm (inch)
Dimensions subject to change
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A-36ED Domes and EDM Domes
Dimensional Drawings
ED Domes
1.2
(0.0472)
12
(0.472)
11.36
12.7 10.35
(0.447)
(0.5) (0.407)
0.8
(0.0315)
5.7 (0.224)
11.3
(0.445)
Upper diaphragm
Switch action principal
The disc contact is essentially made
of two separate conductive domes
Pressure
diaphragms separated by an insulated
material.
The upper diaphragm is shaped so that
under pressure it collapses suddenly
Insulating
and establishes contact with the lower
washer
diaphragm. Lower diaphragm
Circular contact area
SWITCH IN RESTING POSITION
SWITCH IN ACTIVE POSITION
Ordering code 1234
Example: ED S SC 0
1 Designation: ED / EDM450 / EDM650
2 Contact material: S = silver,
G = gold
3 Contacts: AC = with PC pins,
SC = with tabs
4 Sealing: 0 = ux sealed,
1 = totally sealed
Dimensions are shown in mm (inch)
Dimensions subject to change
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A-37