MD and MDP Key Switches
The disc contact type ED is a momentary
key switch with short travel and good
tactile feedback.
The ED is the main component of the
MD and MDP switches.
MDP-Disc push-button key switch
Small momentary key switch equipped
with button, can be mounted on printed
circuit board.
MD-Disc push-button key switch
Small momentary key switch including
a protective rubber actuator.
A wide range of keyboards can be built
by using the MD.
MD and MDP key pads are available in
two contact materials:
gold plated bronze
silver plated bronze
Construction
Function
Contact arrangement
Distance between button centers, min.
Terminals
Electrical data
Switching power max.
Switching voltage max.
Switching current max.
Dielectric strength (50 Hz/1 Min.)
Operating life with
MD
max. switching power
MDP
Contact resistance, initial
Insulation resistance
Contact bounce
Mechanical data
Switching travel
Operating force
Momentary
1 make contact = SPST
12.7 (0.500)
PC pins
Silver
6 W AC/DC
100 V AC/DC
100 mA AC/DC
300 V
10
6
2 10
5
10 mΩ
10
11
Ω
100 µs
MD
0.6 (0.0236)
2.6N ± 25%
(260 grams ± 25%)
Gold
3 W AC/DC
100 V AC/DC
50 mA AC/DC
300 V
5 10
6
2 10
5
15 mΩ
10
11
Ω
100 µs
MDP
0.3 (0.0118)
2.4N ± 25%
(240 grams ± 25%)
Further data
Contact material
Operating temperature
Storage temperature
Climatic category (days)
Soldering by static bath
Silver, Gold
– 25°C to + 70°C
1
)
– 40°C to + 85°C
10 for silver version
56 for gold version
255°C for 5 seconds
1
) Special design for ambient temperature – 40°C to + 85°C (Type MD40) available (not washable in solvents)
Note: MD40 disc keyswitch conforms to climatic category 40/85/56.
Dimensions are shown in mm (inch)
Dimensions subject to change
www.ittcannon.com
B-13
MD and MDP Key Switches
Dimensional Drawings
MD
(0.4)
(0.138)
(0.2)
(0.2)
(0.0315)
(0.2)
(0.1)
(0.5) (0.4)
(0.1)
(0.2)
Holes for additional fixing
(0.5)
(0.157) (0.197)
MDP
(0.315)
(0.0591)
(0.238)
(0.2)
(0.4)
(0.2)
(0.315)
(0.2)
(0.1)
(0.5)
(0.1)
(0.2)
Holes for additional fixing
(0.5)
(0.157) (0.138)
Button MDP
(0.472)
(0.0138)
(0.11)
(0.0748)
(0.394)
(0.0591)
(0.394)
(0.472)
(0.0984)
(0.0591)
(0.472)
Ordering code
Example:
1
2
3
Designation:
MD, MDP, MD40
Contact material:
AG = silver,
AU = gold
MDP button color:
01 = black,
02 = white,
03 = red,
04 = light grey,
05 = dark grey,
07 = blue
1
MD
2
AG
3
04
Dimensions are shown in mm (inch)
Dimensions subject to change
www.ittcannon.com
B-14
PCB设计
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