Contact element for keypads

Selection of contact elements in the keypad.

Part of the Shin-Etsu range of keypads is the contact element at the bottom section of each key that makes the actual electrical contact on the PCB or FPC. A range of materials are offered to meet various specific requirements towards switching electronic equipment. In addition to passive contact elements, metals domes are available that include a specific metal click-response.
Attaching metal domes to the keypad has the advantage that the pressure point is always centralized on the dome guaranteeing best click feeling by eliminating certain assembly tolerances.

Keypad contact element types

Type

Conductive
material

Hardness

Tensile
strength
Elongation

Compression
set
Resistivity

Contact
resistance
Size ∅

T

UnitShore AN/mm2%%Ω.cmΩmmmm
DCPDirect Contact Print
carbon silicone ink layer
(50)(9)(350)(10)4.0< 200
20 typical
Various
shapes
2.5 ~ 6.0
> 0.03
C40PCarbon silicone rubber pill655200184.0< 200
20 typical
Round
2.5 ~ 5.0
0.55
Alpha97Carbon silicone rubber pill806.7160360.7< 20
5 typical
Round
3.0, 3.5, 4.0
0.55
GoldAu plated Ni/Cu
plate
(50)(9)(350)(10)1.0 . 10^-2< 2
0.5 typical
Round
3.0, 3.5, 4.0
0.5
H-flexAu plated Ni/Cu
plate
(50)(9)(350)(10)1.0 . 10^-2< 2
0.5 typical
Round
3.0
0.55
JIS K6301AJIS K6301JIS K6301JIS C2123
150 °C, 22hrs
Test based on Shin-Etsu standard test on Au plated PCB, 1.0 pitch, track width 0.5 mm.

Keypad metal domes contact element types

Type

Conductive
material

Size ∅

Contact
resistance
Peak
force
Stroke

Click
ratio
UnitmmΩNmm%
MDSUS< 500.8 ~ 80.8 ~ 1.50 ~ 70
IFSUS301CSP-H


4.0< 501.8 ± 0.40.14 ± 0.0545 ± 10
IFSUS301CSP-H5.0< 501.8 ± 0.40.18 ± 0.0545 ± 10
IFSUS301CSP-EH5.5< 503.8 ± 0.50.23 ± 0.0540 ± 10
IFSUS301CSP-EH
+ carbon coating
5.5< 1003.9 ± 0.50.24 ± 0.0540 +10/-15

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