ED Domes and EDM Domes
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
Function
Contact arrangement
Distance between button
Terminals
Electrical data
Switching power max. AC/DC
Switching voltage max. AC/DC
Switching current max. AC/DC
Carrying current max. AC/DC
Dielectric strength (50 Hz/1 Min.)
Operating life with max. switching
power
Contact resistance
Insulation resistance (100 V)
Contact bounce
Mechanical data
Switching travel
Operating force
ED
Momentary
1 make contact = SPST
12.7 (0.500 )
PC pins or tabs
Silver
6W
100 V
100 mA
250 mA
300 V
10
6
operations
10 mΩ
10
11
Ω
100 µs
EDM
Momentary
1 make contact=SPST,NO
12.7 (0.500 ) centers, min.
PC pins or tabs
Gold
3W
3W
100 V
100 V DC
50 mA
50 mA
250 mA
300 V
300 V
6
5 10 operations
15 mΩ
10
11
Ω
100 µs
15 mΩ
10
11
Ω
1ms
EDM
0.4 (0.0157 )
Max. admissible 0.5
(0.0197)
4.5N (450 grams) ±25%
6.5N (650 grams) ±25%
ED
0.3 (0.012 )
Max. admissible 0.5
(0.02)
2.4N ± 25%
(240 grams ± 25%)
Further data
Contact material
Silver plated, Gold plated
Operating temperature
– 25°C to + 70°C
Storage temperature
– 40°C to + 85°C
Material
housing
contact base
plating of contact area
Climatic data
Climatic category (days)
Soldering by static bath
Ag (silver plated)
Au (gold plated)
-55°C to +85°C
-55°C to + 85°C
Thermoplastic
Phosphor bronze
1.5 microns gold (G)
10 for silver version
56 for gold version
255°C for 5 seconds
Ordering code: see next page.
Dimensions are shown in mm (inch)
Dimensions subject to change
www.ittcannon.com
A-36
ED Domes and EDM Domes
Dimensional Drawings
ED Domes
1.2
(0.0472)
12
(0.472)
12.7 10.35
(0.5) (0.407)
0.8
(0.0315)
11.36
(0.447)
11.3
(0.445)
5.7 (0.224)
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
Pressure
Lower diaphragm
SWITCH IN RESTING POSITION
Insulating
washer
Circular contact area
SWITCH IN ACTIVE POSITION
Ordering code
Example:
1
2
3
4
Designation:
ED / EDM450 / EDM650
Contact material:
S = silver,
G = gold
Contacts:
AC = with PC pins,
SC = with tabs
Sealing:
0 = flux sealed,
1 = totally sealed
1
ED
2
S
3
SC
4
0
Dimensions are shown in mm (inch)
Dimensions subject to change
www.ittcannon.com
A-37
京公网安备 11010802033920号
EEWORLD
