吃瓜tv 路 ENGINEERING GUIDE
Nan Ya NP-175F PCB: Thermal Expansion and Stackup
Nan Ya NP-175F is a high-Tg material choice whose value should be assessed against the board's thermal and interconnect requirements. The plain F designation must remain separate from FBH, FM and other variants. A shared family number does not make their data interchangeable.
This page focuses on thickness expansion and the finished stackup. The Nan Ya material guide covers broader selection; the engineering tool below illustrates a limited thermal relationship using user-supplied inputs.
Start with exact-grade thermal evidence
The official product chart includes NP-175F, but a chart entry alone does not supply every coefficient and test condition needed for a reliability analysis. Obtain the controlled sheet for the proposed supply and preserve Tg method, directional CTE and temperature interval.
Do not transfer the NP-175FBH technical sheet to plain NP-175F. An integrated expansion percentage, a below-transition coefficient and a decomposition temperature are different quantities. They should remain separate rows in the material review.
Material facts and decision boundaries
| Item | Source or model context | What it does not establish |
|---|---|---|
| Material | Plain NP-175F | Distinct from FBH and FM. |
| Thermal data | Direction, interval and method | Do not merge CTE and integrated expansion. |
| Tool | Two-slope free thickness model | No copper constraint or fatigue. |
Identify the construction most affected by expansion
List total thickness, critical hole depth, copper-barrel requirements and assembly history. A long plated barrel, an HDI interconnect and a surface-mounted package have different mechanical boundaries. Material selection should follow the actual structure that must be verified.
The NP-155F guide offers a neighboring hole-geometry discussion. It does not establish equivalence between the two materials. When comparing them, use the same board architecture and acceptance requirements.
| Review item | What to establish |
|---|---|
| Source boundary | Plain NP-175F, not FBH or FM data. |
| Thermal definition | Direction, interval and method retained. |
| Critical feature | Thickness, holes and assembly history. |
| Model limit | Free expansion is not interconnect life. |
Use the piecewise worksheet to check assumptions
The model calculates free dielectric thickness change with two constant coefficients around an assumed transition. Its example is deliberately generic: 1.6 mm thickness, 25鈥�200掳C heating, a 150掳C transition and 50/250 ppm/掳C coefficients. The result is 30 碌m of unconstrained change.
Those values are not an NP-175F preset. Real polymers have gradual transitions and the finished board includes copper constraint and process history. The calculation cannot predict fatigue cycles, delamination or a permitted number of soldering operations.
Keep electrical and insulation requirements separate
Thermal expansion does not establish high-voltage performance or signal loss. For a specific -15 insulation-related request, the NP-175FBH-15 page owns the exact suffix and evidence question. Do not infer a working voltage from the base material number.
For a channel-driven comparison, use the NP-175FM electrical review. It distinguishes FM from FMR and keeps construction-specific loss data separate from a generic high-Tg label.
Record stackup and process changes for repeat orders
A proposal that keeps the overall thickness can still change cores, bonding intervals, copper or reinforcement. Review those changes against impedance, registration and critical hole requirements. Keep approved material and construction revisions together.
Ask which representative structures will be measured or tested and what the delivered evidence will contain. A raw-laminate certificate does not replace finished-board inspection, and a successful easy region may not represent the most demanding feature.
Piecewise free thickness expansion
Piecewise free thickness expansion
Use the current inputs and keep the assumptions
Start with the example only to inspect the units and the calculation boundary. Replace every assumption with a value tied to your own document or measurement. An empty numeric field is not zero. The review-reference field is a local label; avoid entering customer names, confidential part numbers or other private information into a public worksheet.
After calculating, read the notes alongside the numerical result. Changing any input invalidates the displayed result and disables its download until you calculate again. For a comparison, keep the units, geometry, material condition and measurement boundary consistent. A long decimal result does not imply equally precise input data. The downloadable record stays on your device and can be attached manually to an inquiry. It is not automatically transferred into the Contact form.
If an input is unknown, identify the person or document needed to resolve it. Do not fill a gap with a favorable generic value simply to obtain a result. You can request a material or fabrication review without using the tool. The arithmetic illustrates a relationship; it does not accept a construction, certify a material, establish current pricing or replace a supplier process specification.
| Input | What to establish before using it |
|---|---|
| Review reference | Nonconfidential revision label. |
| Initial dielectric thickness 路 mm | Unconstrained specimen approximation. |
| Start temperature 路 掳C | Must be less than final temperature. |
| End temperature 路 掳C | Heating illustration only; not an approved exposure. |
| Assumed transition temperature 路 掳C | Simplified sharp transition; use a defined measurement method. |
| CTE below transition 路 ppm/掳C | Direction-specific value over the relevant interval. |
| CTE above transition 路 ppm/掳C | Direction-specific value, not copied from in-plane CTE. |
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.
Optional project allowance comparison
Ask for a thermal-construction quotation
Send the NP-175F source revision, layer structure, copper, drill data, dimensions and quantity. Include assembly and repair expectations, fixed requirements and any permitted alternatives. Identify the evidence needed to support the material decision.
The optional allowance calculator uses entered values only. Compare the same construction, test scope and quantity; no current market price is embedded. A useful manufacturing reply states the proposed material and open exceptions before the board is released for production.
Close the material and construction decision together
The finished board combines a dielectric, copper patterns, holes, surface coatings and a manufacturing history. Its behavior cannot be inferred from a family name alone. State the supplied grade, reinforcement, thickness, copper and processing conditions that matter to the intended application.
Keep handling and assembly requirements with the fabrication drawing. A thin panel, punched outline or unusual support condition can change the production route even when the electrical circuit is simple. Ask the fabricator to review the actual features and panel format rather than assuming a dimensional example represents a production capability.
For cost comparison, hold the drawing, quantity, test scope and acceptance requirements constant. Record one-time tooling separately from recurring work, and distinguish raw material utilization from accepted-board yield. Any calculator on this page uses supplied assumptions; an actual quotation requires the files and an agreed scope.
A source-qualified table should be read alongside the exclusions and footnotes, not separated from them. If the supplier limits an application, identify whether that limitation affects the current design before requesting a price. A familiar family classification does not override an explicit restriction, and a positive calculator result cannot remove it.
For a repeat build, compare the newly proposed supply with the previously approved material record. Exact grade, manufacturing site where relevant, foil treatment, reinforcement and dimensional basis can matter. Define which changes require notification and which need technical approval. This avoids turning a purchasing substitution into an unnoticed design change.
Receiving records should support the agreed identity and traceability requirement. A certificate for a raw material, a finished-board inspection report and an assembly test result cover different boundaries. Request the records that actually answer the project questions rather than collecting unrelated certificates.
When a source contains conflicting values, keep the discrepancy visible until a controlled revision or written supplier response resolves it. Do not create a new table by combining the most favorable entries from several sources. The released drawing, material list and quotation should all describe the same accepted construction.
Standards, source context and limits
Use the edition, amendment and material-document revision named in the purchase agreement. A standards title, marketing label or supplier product family does not establish that a particular lot meets a requirement. Public summaries are useful for scope; the controlled specification and applicable test method govern acceptance.
The examples on this page are illustrative engineering scenarios. They are not 吃瓜tv production records or guaranteed material values. Source links identify the organizations responsible for the referenced information. Confirm applicability to the exact grade, construction and test condition before carrying a number into a drawing or qualification report. Sources were reviewed on 3 October 2026. A public catalog search is not proof that an unlisted product never existed. Where the exact designation or current technical sheet could not be verified, this page provides a clarification workflow rather than an invented material specification. Current supply, construction availability and qualification remain separate questions.
For fabrication scope and the agreed construction requirements, see PCB manufacturing.