吃瓜tv

Understand the resin-coated copper section

RCC combines copper with a resin layer that becomes part of the dielectric construction. In a buildup process, the final relationship between copper, resin and the underlying pattern depends on the approved material and process. A nominal supplied thickness should not be confused with every local finished dielectric dimension.

The absence of woven-glass reinforcement changes the material-form question, but it does not eliminate registration, thickness control or adhesion requirements. Keep the exact supplied construction and copper treatment in the stackup. The SP175M prepreg guide addresses another bonding route and should not be treated as an equivalent product description.

Source-qualified material review

Read the electrical data without inventing an RF class

The cited S6015 data report typical Tg of 145掳C by DSC and Dk/Df of 3.4/0.018 at 1 GHz with the stated method and conditioning. These are source-qualified characterization values. A relatively low Dk does not automatically mean very low dielectric loss or suitability for a particular microwave circuit.

Use the electrical model appropriate to the finished structure and frequency. Copper treatment, conductor shape and adjacent layers affect impedance and loss. If a source value does not describe the actual construction, record the uncertainty before fixing trace geometry.

Dielectric opening aspect-ratio illustration

Optional cost comparison from your own allowances

Use a quotation or a clearly labeled internal assumption for each input. Keep the quantity, construction and inspection scope the same when comparing alternatives. This uncalibrated planning model adds entered values; it contains no current market rates and does not issue a 吃瓜tv quotation. You can contact the team without completing it.

Define the opening before calculating a ratio

The worksheet divides dielectric opening depth by the entered diameter. A 60 碌m depth and 100 碌m declared diameter produce a ratio of 0.6. For a tapered opening, entrance diameter and minimum diameter are different conventions and produce different ratios.

State which dimension you are using. This tool does not select a laser process, an IPC limit or a plating capability. Target-pad capture, taper, residue removal, metallization and any filled or stacked arrangement require a manufacturing review of the full construction.

Keep buildup registration and target capture visible

Supply the layer sequence and identify the target pad for each opening. A well-defined individual hole does not resolve how registration accumulates across a sequential build. Copper distribution and local dielectric thickness can also affect the process window.

Discuss the critical locations with the fabricator and agree which evidence represents them. Do not generalize from a nominal aspect ratio to an unlimited layer count or repeated stacked-via reliability. The approved stackup and via drawing should remain synchronized after every design change.

Preserve storage and processing identity

Obtain the current product instructions for packaging, exposure and processing. A general claim of extended shelf life is not a date that can be assigned to every roll or sheet. Record the lot, supplier-defined starting point and the actual handling conditions.

Do not apply a cured-core bake procedure to an uncured bonding material without supplier direction. For a different bonding designation such as Synamic 6BF, first resolve the exact product and form. Similar-looking copper or resin surfaces cannot identify the chemistry or cure state.

Request a buildup review with the right files

Include the stackup, copper layers, opening map, target-pad geometry, dimensional requirements, quantity and assembly exposure. State whether S6015 is mandatory or whether another RCC route can be evaluated. Identify any electrical or reliability evidence required before release.

The cost worksheet uses only the allowances entered by the visitor. Sequential processing, verification and material utilization can change the real quote, so request pricing against a reviewed construction. The Shengyi material overview is the natural next step for broader alternatives, while this page retains the S6015-specific buildup task.

Review supplied form, local geometry and process together

A stackup is an agreement about physical construction, not just a vertical list of copper layers. Give each dielectric interval an identity and distinguish cured core thickness from the pressed thickness of bonding material. State whether copper is included in every quoted dimension.

Review the implications of a material change across impedance, lamination, drilling, registration and assembly exposure. A replacement with a similar headline Tg or Dk can still require a different geometry or process. Preserve the approved layer order, copper distribution assumptions and measurement basis with the manufacturing files.

Use the worksheet to organize a review, then obtain the fabricator's proposed construction and tolerances. Close differences before release. The final stackup, drawing and procurement material list should reference the same revision, especially when multiple suppliers or repeat orders are involved.

Bonding materials cannot be selected from a cured-laminate table alone. Establish whether the product is woven-glass prepreg, another reinforced bonding system or resin-coated copper. Each form has a different relationship between its supplied condition and the finished dielectric interval. Preserve the exact product and source revision in the proposed build.

Local copper distribution matters. Average coverage can conceal a large clearance region, a thick copper transition or a difficult target area. Supply the actual artwork and identify the locations that drive filling, registration or opening requirements. A single global thickness or aspect ratio does not characterize every local feature.

Process guidance should be applied by the responsible manufacturing team to the actual construction. A public document does not replace press-load qualification, handling controls or an approved drilling and metallization route. Do not use a generic bake or cure instruction for an unidentified bonding material.

Agree how the critical features will be verified. Representative cross-sections, dimensions and appropriate electrical or reliability evidence answer different questions. Keep the selected locations and acceptance requirements with the drawing so that a successful easy region is not mistaken for evidence about the most demanding feature.