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.

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-H4.0< 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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