High Performance Silver Connectors

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FUJIPOLY low resistance ZEBRA® elastomeric connectors are constructed of alternating parallel layers of electrically conductive and non-conductive silicone elastomer. The electrically conductive layer is filled with silver-metal particles. The composite alternating layers provide reliable electrical connection when placed between two aligned conducting surfaces.

The low resistance ZEBRA® provides a redundant connection with a minimum of two conductive layers recommended per PC contact pad. The connector is available with insulating barrier or silicone supports (See page 6). The connectors are used for connecting electroluminescent (EL) and plasma type displays to PC boards or for connecting hybrid circuits to PC boards, among other applications.

Low resistance ZEBRA® connectors are positioned between two aligned surfaces and are mechanically clamped together with a lid or another PC board. The connectors may be free standing or positioned in a retainer depending on packaging profiles and design.

Series Contact Spacing Center-to-Center Pitch:
Sum of the Thickness of an Adjacent Conductiveand Non-conductive Layer
Conductive Layers per inch Individual Conductive and Insulating Layer Thickness Available Lengths
Minimum Nominal Maximum Minimum Minimum Maximum
SZ100 0.38 mm 0.100 mm 0.152 mm 240 0.025 mm 0.075 mm 127 mm
TABLE A (For requirements over 4” consult factory)
Measurement Tolerance (mm)
Length=L 6.35 ± 0.12mm to 127.00 ± 0.64mm
Height=H 1.00 ± 0.08mm to 12.70 ± 0.18mm
Width=W 0.50 ± 0.08mm to 2.54 ± 0.13mm
TABLE B
EBRA® Connectors Temperature Range Current Carrying Capacity
0.040” x 0.040” pad
Resistance Between Layers
Minimum Maximum
Silver ZEBRA® -40°F 185°F 0.3 amps 1012 ohms
-40°C 85°C
TABLE C

Self-Support and Insulation Barrier

Details show silicone support (left) and insulation barrier (right). Each is available on one or both sides. Configurations may also include support on one side and insulation on the other.
Note: Recommended Height (H) should be twice Width (W) dimension for minimum force deflection. Maximum Skewness 2% of Height.

Design Recomendations

Recommended deflection range is 5-25% of free height. Minimum deflection will vary with packaging applications and should consider overall height, PC board warpage, finish, etc.(Contact FUJIPOLY Product Application Engineering for assistance.) Design recommendations for solid ZEBRA® over 0.400” deflect 0.050” maximum. Silicone supported over 0.400” deflect 0.060” typical.

Test Conditions

The use of an insulating barrier or silicone self-support material on one or both sides of the connector is recommended. The silicone support is utilized to reduce clamp force and provide an element of environmental protection for a cost-effective connection.

Item Standard Test Method
High Temperature MIL-202D-108A 85° C 1500 hr
Low Temperature -40° C 500 hr
Moisture MIL-202D-103B 40° C 95% RH x
500 hr (250mA/pad)
Thermal cycle MIL-202E-107G 65°C/25°C/150°C/
25°C, 5 cycles

Nominal Resistance Calculation

For the purpose of calculating the resistance of silver ZEBRA® connectors and testing them for compliance please use the following formula:

Where:
R = Resistance in Ohms
W1- = Width of ZEBRA® portion (mm)
Ew = Electrode pad width (mm)
H = ZEBRA® height (mm)
Metric (mm)
R = H x 0.01 + 0.10
EwxW1

Example: if ZEBRA® is 2.54 mm H and 0.762mm W, then the maximum resistance on a 1.27 mm wide pad will be:

Metric:
R = 2.54 x 0.01 + 0.10 = 0.127 ohms
0.762 x 1.27

Nominal Force Deflection Plain ZEBRA® or Insulation Barrier Type

ZEBRA® connectors should be deflected 5% to 25% of H. To calculate F-Force for deflection, use the following formula:

Where:
F = Force (N)
D = H – H1 x 100 (%)
H
H = Height of connector (mm)
H1 = Deflected height of connector (mm)
W = Width of connector (mm)
W1 = Width of ZEBRA portion (mm)
L = Length of connector (mm)
Metric:
F(N) = 9 x D x W x L x 9.8 x 10-3

Nominal Force Deflection – Silicone Support Type

Metric:
F(N) = [(9 x D x W1 xL) + {2.2 x D x (W-W1) x L}] x 9.8 x 10-3