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