►Product name：Copper Etched FPC Circuit membrane switches
►Keyword:membrane switches,FPC membrane switches,circuit membrane switches,printed circuit membrane keypad,copper membrane switch,copper flex Membrane Switches,FPC membrane keypad.
►Specification
Outer dimension: 237*39.8mm
Graphic overlay: F200
Key type: Metal dome
Circuit: copper printed circuit FPC circuit
Back adhesive: 3M300 LSE
Led: bi-color yellow-green led 0603 *7pcs, red led 0603*1pcs
Connector: 0.5mm pitch with stiffener
The circuit of membrane switches can be flex and rigid. It depends on the customer end application and also related to the cost budget and other considerations. For example, life, resistance, connection type on main board etc.
For the flex circuit membrane switches, there are two types: Silver printed PET circuit and copper etched FPC circuit.
Their difference and advantages & disadvantages are listed bellow:
| Items |
Silver Printed Circuit |
Copper Etched FPC Circuit |
| Material |
PET (Polyester) |
Polyimide |
| Conductor |
Printed silver |
Copper |
| Contact Fingers |
Silver and Carbon |
Gold plated |
| Contact Buttons Pads |
Silver |
Gold plated |
| Life & Reliability |
normal |
good |
| Stability |
normal |
good |
| Resistance |
Normal |
Very low |
| Cost |
low |
high |
| Lead Time |
12-15 working days |
12-15 working days |
| Pitch |
1.0mm,1.27mm,2.54mm |
0.5mm, 1.0mm,1.27mm,2.54mm |
If you don’t know how to choose, please kindly contact FLEXKYS to give you best suitable solution.
►Structure presentation
►FPC membrane advantages compared with silver film switch
①Low resistance（10% of silver film switch）
②load large current（Normally 1Acurrent/0.5mm line）
③Components(LED and resistance)can be welded more firmly
④Good oxidation resistance, suitable for humid environment
⑤The connector at the end of cable can be made to smaller to save space.
►Normal material:
（1）Graphic overlay material：
| |
Finish |
Specification |
| PC(polycarbonate) |
Gloss |
0.175/.25/.35/.5 mm thickness |
| Matt |
0.175/.25/.35/.5 mm thickness |
| PET (polyester) |
Fine Texture |
0.15/.20 mm thickness (Autotex F150/F200, imported) |
| Velvet Texture |
0.15/.20 mm thickness (Autotex V150/V200, imported) |
| Gloss with Hard Coat |
0.18 mm thickness |
（2）FPC：
1. ounce copper,total thickness 0.135~0.15mm
2. back adhesive material:3M467, 3M468, 3M9080A or others alternative
3. connector alternative :female:2.54mm；ZIF 1.0mm，ZIF 0.5mm or others specified
►Working environment
Temperature：-20~80℃
Humidity：40℃，RH <95%
►Electrical performance
Circuit voltage：DC 50V MAX (others need meet components）
Circuit current：1A MAX
Closed circuit resistance：normally <10 ohm（details see products designing and circuit length）
Button working life：>0.5 million times
Response time:<10 mS
►Notice on mounting and operation
①Clean up the surface where the switch is bonded and make sure it is flat,without rust,oil and dust.
②Compare the size to membrane switch where need be stick ,check if position is correct.
③Tear off 10mm length of the bottom release paper from side.
④ Put the tail through the back board. Please do not pull the tail with force. The minimum bending radian of the lead wire is R=2mm. The hold edge must smooth in case of damaging the tail.
⑤Align the panel with the sticking place and press on the fixed part, then slowly remove the rest release paper and flat the panel.
⑥The stick process is finished in one time.Switch can not be repeated stick.
⑦Please make sure the bending angel of panel is lower than 15 degree when sticking.
⑧Please do not pull the connector so hard when in connection. For female connector, please hold the house when in connector.
⑨Do not pull the lead wire directly. For FPC( Flexible printed circuits) structure, please unlock the socket before plugging.
⑩Note:To assure the switch life,please put it on the table flatly when testing the hand feeling.Do not pinch the button when holding it on hand.
