Contacts

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.

Contact element examples
       
 Alpha97 pill  Combination of carbon pill and metal dome  Printed contact DCP  IF metal dome

 

Contact elements
 Type  Conductive material    Hardness  Tensile strength  Elongation  Compression set  Resistivity  Contact
 resistance
 size ∅  T
       JIS K6301 A  JIS K6301 
 N/mm2
 JIS K6301 
 %
 JIS C2123
 150º C, 22 hrs
 %
 Ω.cm  Ω  mm  mm
 DCP  Direct Contact Print 
 carbon silicone ink layer
   (50)  (9)  (350)  (10)  4.0  < 200
 50 typ.
 various shapes
 2.5 ~ 6.0
 > 0.03
 C40P  carbon silicone rubber pill    65   5  200  18  4.0  < 200
 20 typ. 
 round
 2.5 ~ 5.0 
 0.55
 Alpha97   carbon silicone rubber pill    80   6.7  160  36  0.7  < 20
 5 typ.
 round
 3.0
 3.5
 4.0 
 0.55
 Gold  Au plated Ni pill   (50)  (9)  (350)  (10)  1.0 • 10-2  < 2
 0.5 typ.
 round
 3.0
 3.5
 4.0
 0.5
 H-flex  Au plated Ni pill     (50)  (9)  (350)  (10)  1.0 • 10-2  < 2
 0.5 typ.
 round
 3.0
 0.55
 Test based on Shin-Etsu standard test on Au plated PCB, 1.0 pitch, track width 0.5 mm    

Tests based on Shin-Etsu standard tests on gold plated PCB, track pitch 1.0 mm, track width 0.5 mm.

IF metal dome contact properties
 Conductive material  Size ∅  Contact
 resistance
 Peak force  stroke

 click ratio

   mm  Ω  N  mm  %
 SUS301CSP-H  4.0  < 50  1.8 ± 0.4  0.14 ± 0.05  45 ± 10
 SUS301CSP-H  5.0  < 50  1.8 ± 0.4  0.18 ± 0.05  45 ± 10
 SUS301CSP-EH  5.5  < 50  3.8 ± 0.5  0.23 ± 0.05  40 ± 10
 SUS301CSP-EH Carbon coating  5.5  < 100  3.9 ± 0.5  0.24 ± 0.05  40 +10/-15

 

Note:
Every item or numerical value indicated herein is measured by Shin-Etsu and out of guarantee.
Characteristics and graphs are for reference only. Actual resistances and forces are up to the design of substrates and assembly constructions. 
More information can be found in the design guides.
The quality of the assembled products is out of guarantee.
Please make sure to review the purpose and conditions of use and practice you own tests.
Industrial ownership like patent doesn't guarantee the usage of products.