Printed Polymer Design Guide

Application HAL HAL lead-free ENIG Immersion Tin Keypad – Switches – Resistor on outer ayer – Resistor on inner layer Potentiometer – – – Heating resi...

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DESIGN GUIDE Version 1.0

Printed Polymer Design Guide

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Keypads

Switches

P-Cu

Cu

P-P P-P

P-LSL

P-LSL

P-P P-P

P-Cu

P-Cu

D

P-P

P-LSL

P-LSL

P-D

Copper width Overlap polymer to copper Distance to other electrical potential Solder mask clearance

P-Cu

Cu

≥ 0.20 mm

Overlap polymer to copper

P-Cu

≥ 0.15 mm

P-Cu

≥ 0.15 mm

Distance to other electrical potential

P-P

≥ 0.5 mm

P-LSL

≥ 0.25 mm

P-D

≥ 0.15 mm

D

≥ 0.3 mm

P-P

≥ 0.50 mm

Solder mask clearance

P-LSL

≥ 0.25 mm

Distance between carbon and dielectric

Copper thickness (total)

≤ 50 µm

Dielectric width

Contact resistance

≤ 20 Ω

Copper thickness (total)

≤ 50 µm

Contact resistance

≤ 20 Ω

Basics „„The print is used as a passivation of the copper to prevent from oxidization and to achieve a constant contact resistance during the lifetime. „„The contact resistance is influenced by the contact material and the contact pressure and is normally < 20 Ω.

„„Two areas with a different electrical potential are shorted by

conductive rubber mats or metal contact springs.

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„„Switches are used with sliding contacts; two contact areas of different

electrical potentials are shorted by the slider.

Resistors Outer Layers

Resistors Inner Layers

Ag-Cu

P-Ag

P-LSL

Ü

blocked for vias

B

B

P-Cu

L

L

Resistor length

L

≥ 2 mm

Resistor width

B

≥ 1.5 mm

Ag-Cu

≥ 0.25 mm

Overlap resistor to silver

P-Ag

≥ 0.15 mm

Solder mask clearance

P-LSL

≥ 0.25 mm

Overlap polymer to copper

Ü

0.20 mm

Overlap polymer to copper

P-Cu

≥ 0.15 mm

Overlap silver to copper

Copper thickness (total)

≤ 50 µm

Distance to other electrical potential

≥ 0.5 mm

Resistor values Resistor tolerance Dissipation at environmental temperature: ≤ 40°C

100 Ω – 750 kΩ +/- 30 %* ≤ 50 mW/mm2

* +/-5 % with laser trimming

Basics „„Printed resistors are built by printing a polymer ink with a specific conductivity between to copper pads. „„The thickness of the resistors is 20 µm in standard. „„With an adjustment of the resistors by laser trimming a lower tolerance can be reached.

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Special Applications

Potentiometer

Heating Resistor

Surface Finishing HAL

HAL lead-free

ENIG

Immersion Tin

Keypad

„

„

„



Switches

„

„

„



Resistor on outer ayer

„

„

„



Resistor on inner layer

„

„

„

„

Potentiometer





„



Application

Heating resistor on outer layer





„



Heating resistor on inner layer

„

„

„

„

Contact plug

„

„

„



Shielding print





„



Non-standard layout configuration can be checked for feasibility by our product management. Feasibility is possible in many cases.

Würth Elektronik Schopfheim GmbH & Co. KG Circuit Board Technology An der Wiese 1 79650 Schopfheim · Germany Tel. +49 7622 397-0 Fax +49 7622 397-122 [email protected] www.we-online.com

DIENECK ARPRINZEN 1014.FLY

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