8-layer RO4003C PCB 5.05mm Green Solder-mask Immersion Gold

This PCB features an 8-layer copper configuration, which is specifically designed for high-frequency and high-reliability electronic applications. Its material composition primarily consists of RO4003C cores, RO4450F prepreg, and high-quality copper foil, where the RO4003C cores serve as the key dielectric layers to ensure excellent signal integrity, and the RO4450F prepreg acts as the bonding medium between layers, working in conjunction with the copper foil to form a stable and high-performance multilayer structure.

PCB Details

PCB Stack-up

RO4003C Multilayer Board Processing Guidelines

Storage

Fully clad RO4003C laminates should be kept at room temperature (ranging from 50-90°F/ 10-32°C). It is advisable to implement a first-in-first-out inventory management system and establish a method to track material lot numbers throughout the PWB manufacturing process and the delivery of finished circuits. This practice helps maintain the stability of RO4003C material performance and ensures the traceability of processing quality.

Inner Layer Preparation

Tooling

RO4003C laminates are compatible with a variety of pinned and pinless tooling systems. The choice between round or slotted pins, external or internal pinning, standard or multiline tooling, and pre-etch or post-etch punching depends on the capabilities and preferences of the circuit manufacturing facility, as well as the final alignment requirements. In most cases, slotted pins, a multiline tooling format, and post-etch punching are sufficient to meet requirements, effectively ensuring the alignment accuracy of the inner layers of RO4003C multilayer boards and minimizing processing errors.

Surface Preparation for Photoresist Processing and Copper Etching

The surface preparation of copper for photo imaging can be achieved through chemical or mechanical processes, depending on the thickness of the RO4003C core. Thinner RO4003C cores should be prepared using a chemical process that includes cleaning, micro-etching, water rinsing, and drying steps to prevent mechanical damage to the core material. Thicker RO4003C cores can be processed with mechanical scrub systems, which efficiently remove surface contaminants and enhance photoresist adhesion.

RO4003C materials are compatible with most liquid and dry film photoresists. Once patterned, they can be processed using develop, etch, and strip (DES) systems commonly used for FR-4 materials, reducing equipment modification costs and improving the processing efficiency of RO4003C multilayer boards.

Oxide Treatment

RO4003C cores can undergo any copper oxide or oxide alternative treatment process in preparation for multilayer bonding. The optimal treatment method is typically the one recommended in the guidelines provided with the selected prepreg or adhesive system. Proper oxide treatment enhances the interlayer bonding strength of RO4003C multilayer boards and ensures their reliability.

Multi-Layer Bonding

RO4003C laminates are compatible with numerous thermosetting and thermoplastic adhesive systems. It is recommended to refer to the adhesive system guidelines for bonding cycle parameters (such as temperature, pressure, and duration) to ensure that the bonding quality of RO4003C multilayer boards meets requirements and to avoid defects like delamination.

Drilling Considerations

Standard entry materials (aluminum or thin pressed phenolic) and exit materials (pressed phenolic or fiber board) can be used when drilling RO4003C cores or bonded RO4003C assemblies in single-layer or multi-layer stacks. The selection of appropriate entry and exit materials reduces drill bit wear, improves the hole wall quality of RO4003C boards, and prevents burrs and other defects at the hole entrances and exits.