What is Selective PCB Gold-Plating?

Selective gold plating of printed Circuit Boards (PCBs) is a specialized manufacturing process that deposits a thin layer of gold onto specific areas of the PCB. Unlike full-board gold plating which covers the entire surface of the PCB, selective gold plating precisely targets only the critical contact points, connectors, and other exposed metal surfaces that require enhanced protection and superior electrical conductivity.

Gold is an excellent choice for plating PCBs due to its outstanding properties:

Property	Benefit
High corrosion resistance	Protects exposed metal from oxidation and deterioration
Excellent electrical conductivity	Ensures reliable signal transmission and low contact resistance
Durability and wear resistance	Withstands repeated insertions and physical abrasion
Solderability	Allows easy soldering of components to gold-plated areas

Advantages of Selective Gold Plating

Compared to full-board gold plating, selective gold plating offers several key advantages:

1. Cost savings: By only plating the necessary areas, selective gold plating uses less gold, reducing overall material costs.
2. Design flexibility: Selective plating accommodates complex PCB Layouts and high-density designs without compromising on protection.
3. Compatibility: Gold-plated areas are compatible with a wide range of connectors and components.
4. Targeted performance: Critical areas receive enhanced protection and conductivity without affecting the rest of the PCB.

Gold Plating Methods

There are two primary methods for selectively gold plating PCBs:

Electroplating

Electroplating is the most common method for selective gold plating. It involves the following steps:

1. Cleaning: The PCB is thoroughly cleaned to remove any dirt, oils, or oxides from the surface.
2. Photoresist application: A photoresist layer is applied to the PCB and selectively exposed to UV light to create a plating pattern.
3. Developing: The unexposed photoresist is removed, leaving behind a plating mask that exposes only the areas to be gold plated.
4. Activation: The exposed areas are activated with a catalyst to promote adhesion of the gold layer.
5. Gold plating: The PCB is immersed in a gold plating solution, and an electric current is applied to deposit the gold ions onto the exposed areas.
6. Photoresist removal: The remaining photoresist is stripped away, leaving behind the selectively gold-plated PCB.

Immersion Gold Plating

Immersion gold plating, also known as electroless gold plating, is a simpler and more cost-effective method for selective gold plating. The process involves the following steps:

1. Cleaning: The PCB is cleaned to remove contaminants from the surface.
2. Activation: The areas to be plated are activated with a catalyst to promote gold deposition.
3. Gold plating: The PCB is immersed in an immersion gold plating solution, which deposits a thin layer of gold onto the activated areas through a chemical reaction.

Immersion gold plating is ideal for applications that require a thinner gold layer and have less stringent performance requirements compared to electroplated gold.

Designing for Selective Gold Plating

To ensure optimal results when selectively gold plating PCBs, consider the following design guidelines:

Pad and Trace Sizes

Proper pad and trace sizes are crucial for successful selective gold plating. Follow these recommendations:

Feature	Recommended Size
Minimum pad size	0.5 mm x 0.5 mm
Minimum trace width	0.15 mm
Minimum spacing between features	0.2 mm

Soldermask Clearance

Ensure adequate soldermask clearance around pads and other areas to be gold plated. A minimum clearance of 0.1 mm is recommended to prevent soldermask from encroaching onto the plating areas.

Plating Thickness

The thickness of the gold plating layer depends on the application and performance requirements. Common gold plating thicknesses range from 0.05 µm to 2.54 µm (2-100 µin). Thicker gold layers offer better wear resistance and durability but also increase costs.

Application	Recommended Gold Thickness
Connectors and contacts	0.76-1.27 µm (30-50 µin)
High-wear areas	1.27-2.54 µm (50-100 µin)
General protection	0.05-0.25 µm (2-10 µin)

Specifying Selective Gold Plating

When ordering selectively gold-plated PCBs, provide your manufacturer with clear instructions and specifications, including:

1. Plating areas: Clearly indicate which areas of the PCB require gold plating, using a separate plating layer in your design files.
2. Gold thickness: Specify the desired gold plating thickness based on your application requirements.
3. Plating method: Choose between electroplating and immersion gold plating, considering factors such as performance, cost, and lead time.
4. Surface finish: Specify the surface finish for the non-plated areas of the PCB, such as HASL, lead-free HASL, or OSP.

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Inspecting Selectively Gold-Plated PCBs

Upon receiving selectively gold-plated PCBs, perform a thorough inspection to ensure the quality of the plating:

1. Visual inspection: Check for any defects, such as uneven plating, voids, or contamination.
2. Thickness measurement: Use X-ray fluorescence (XRF) or cross-sectioning to verify that the gold plating thickness meets the specified requirements.
3. Adhesion testing: Perform a tape test or a scratch test to assess the adhesion of the gold layer to the PCB substrate.
4. Continuity testing: Use a multimeter or a Continuity Tester to ensure that the gold-plated areas maintain electrical continuity.

Frequently Asked Questions (FAQ)

1. What is the difference between selective gold plating and full-board gold plating?

Selective gold plating deposits gold only on specific areas of the PCB, such as connectors and contacts, while full-board gold plating covers the entire surface of the PCB. Selective plating offers cost savings and design flexibility compared to full-board plating.

2. Can selective gold plating be applied to both through-hole and surface-mount pads?

Yes, selective gold plating can be applied to both through-hole and surface-mount pads. The plating process can accommodate various pad sizes and shapes, ensuring proper coverage and protection.

3. How does selective gold plating affect the solderability of the PCB?

Gold is highly solderable, and selectively gold-plated areas on a PCB offer excellent solderability for component assembly. However, excessively thick gold layers (>1.27 µm or 50 µin) may lead to brittle solder joints due to the formation of gold-tin intermetallic compounds.

4. What is the typical turnaround time for selectively gold-plated PCBs?

The turnaround time for selectively gold-plated PCBs depends on factors such as the PCB complexity, plating specifications, and manufacturer’s production schedule. Typical turnaround times range from 1-3 weeks, but expedited services may be available for urgent projects.

5. How much does selective gold plating add to the cost of a PCB?

The cost of selective gold plating depends on the size of the PCB, the area to be plated, and the desired gold thickness. On average, selective gold plating can add 10-30% to the base cost of the PCB. However, the cost increase is significantly lower compared to full-board gold plating.

Conclusion

Selective gold plating is an essential process for enhancing the performance, reliability, and durability of critical areas on PCBs. By understanding the methods, design considerations, and specification requirements for selective gold plating, you can ensure that your PCBs meet the highest standards for your applications. Work closely with your PCB Manufacturer to determine the best selective gold plating options for your project, and always perform thorough inspections to verify the quality of the final product.