{"id":5148,"date":"2026-04-13T15:01:44","date_gmt":"2026-04-13T07:01:44","guid":{"rendered":"https:\/\/txjpcba.com\/?p=5148"},"modified":"2026-04-13T15:01:44","modified_gmt":"2026-04-13T07:01:44","slug":"what-areas-should-not-be-coated-on-pcb","status":"publish","type":"post","link":"https:\/\/txjpcba.com\/es\/what-areas-should-not-be-coated-on-pcb\/","title":{"rendered":"What areas should not be coated on PCB?"},"content":{"rendered":"

Coated on PCB<\/h3>\n

En Revestimiento conforme<\/strong> en Montaje de PCB<\/strong>, Montaje de prototipos de PCB<\/strong>, y Montaje SMT<\/strong>, it is essential to define keep-out areas<\/strong>\u2014regions that must remain free of coating to ensure proper electrical performance, connectivity, and serviceability. Coating the wrong areas can lead to poor contact, signal issues, or even complete product failure.<\/p>\n

\"What
What areas should not be coated on PCB<\/figcaption><\/figure>\n

Below are the key areas that should not<\/strong> be coated:<\/p>\n

Connectors and contact pins<\/strong>
All connectors, edge fingers, sockets, and contact pads must remain uncoated. Applying Revestimiento conforme<\/strong><\/a> on these surfaces can block electrical conductivity and prevent proper mating with cables or modules. This is one of the most critical masking requirements in Montaje de PCB<\/strong>.<\/p>\n

Test points and programming interfaces<\/strong>
Test pads, probe points, and programming headers should be kept free of coating to allow electrical testing, debugging, and firmware updates. In Montaje de prototipos de PCB<\/strong><\/a>, access to these points is especially important for validation and troubleshooting.<\/p>\n

Switches and mechanical components<\/strong>
Buttons, relays, jumpers, and other moving parts should not be coated. Coating can interfere with mechanical operation or cause components to stick, reducing functionality in Montaje SMT<\/strong> productos.<\/p>\n

Heat sinks and thermal interfaces<\/strong>
Areas designed for heat dissipation\u2014such as heat sinks, thermal pads, or power components\u2014should typically remain uncoated or use specialized thermal coatings. Standard coatings may act as thermal insulators, reducing heat transfer efficiency.<\/p>\n

High-voltage clearance gaps<\/strong>
Certain high-voltage areas may require controlled spacing for safety and performance. While coating can improve insulation, improper application may bridge gaps or trap contaminants, affecting reliability. Careful design consideration is needed during Montaje de PCB<\/strong><\/a>.<\/p>\n

Grounding points and shielding areas<\/strong>
Metal shielding zones or grounding contacts should remain exposed to ensure proper electromagnetic shielding and grounding performance.<\/p>\n

Connectors for high-frequency signals (RF areas)<\/strong>
In RF circuits, coating can alter impedance or signal characteristics. Sensitive areas such as antennas or RF connectors may need to remain uncoated or require specialized materials.<\/p>\n

Optical components (LEDs, sensors)<\/strong>
LED lenses, optical sensors, and display elements should not be coated, as the coating can block or distort light transmission. In Montaje SMT<\/strong><\/a>, masking these areas is crucial for maintaining optical performance.<\/p>\n

Why proper masking matters<\/strong>
Failing to protect these areas can lead to:<\/p>\n