Is this 4-Layer ENIG PCB Cost Reference an official quote?

No. This page is a reference-only planning draft. Omini confirms real pricing only after reviewing the released manufacturing files, BOM, inspection scope, test requirements, quantity, lead time, packaging, and shipping assumptions.

Why is the cost range withheld?

The source record has not passed price source review or commercial review. Withholding the range prevents a draft page from becoming an unsupported price claim or purchase expectation.

When should I request a formal RFQ?

Request a formal RFQ when Gerber or ODB++, stackup, BOM, centroid, assembly drawing, quantity, target lead time, inspection scope, and test criteria are ready for engineering review.

4-Layer ENIG PCB Cost Reference

Direct Answer

4-Layer ENIG PCB Cost Reference is a reference-only draft. The cost and lead-time ranges are intentionally withheld until price source review and commercial review are complete.

Reference ranges are planning aids only. Omini confirms real PCB or PCBA pricing only after reviewing Gerber or ODB++, stackup, BOM, centroid, assembly drawings, inspection scope, test requirements, quantity, lead time, packaging, and shipping assumptions.

Reference Scope

4-layer FR4 or high-Tg FR4, ENIG, 50-120 x 50-120 mm, 10-100 units, bare_pcb, standard lead-time profile.

This page does not replace a formal RFQ and cannot be used as a purchase order price.

Reference Range Status

Typical cost range: withheld pending source review: Requires approved quote statistics or benchmark source before publication.
Lead-time range: withheld pending source review: Requires approved production lead-time source before publication.
Confidence: low (0.2). Numeric ranges are blocked until source review.
Last reviewed: 2026-08-03. Next review due: 2026-11-03.

Cost Drivers

Layer count: 4 layers changes lamination, drilling, test, and yield assumptions.
Material and finish: FR4 or high-Tg FR4 with ENIG changes laminate sourcing, solderability, surface flatness, and storage assumptions.
Board size and quantity: 50-120 x 50-120 mm at 10-100 units changes panel utilization, setup allocation, and handling cost.
Assembly scope: bare_pcb controls whether stencil, placement, inspection, BOM handling, programming, or functional test can affect the reference range.

Lead Time Drivers

Source review must separate normal fabrication or assembly time from material sourcing, component lead time, fixture readiness, inspection depth, documentation, packaging, and shipping.
The current lead-time profile is standard; expedited handling must stay outside this reference until a formal RFQ confirms capacity and material availability.
Blocked records keep lead-time ranges withheld so the draft cannot be mistaken for a delivery promise.

Manufacturing Notes

Four layers add lamination, registration, stackup review, and electrical-test complexity.
ENIG changes finish cost and solderability assumptions compared with HASL or OSP.

Tolerance Notes

Controlled impedance, fine trace/space, or tight drill tolerance must be priced separately.
Stackup thickness and dielectric assumptions must be reviewed before publication.

Assumptions

Bare PCB only; no component sourcing or assembly.
No blind vias, buried vias, via-in-pad, RF laminate, or special documentation package.
Numeric cost and lead-time ranges are withheld until source review.

When To Request Formal Quote

Request a formal RFQ when the released package is specific enough for manufacturing review: Gerber or ODB++, stackup, drill files, BOM, centroid, assembly drawing, quantity, lead time, inspection scope, test plan, packaging, and shipping assumptions. This page should help the buyer understand what changes the range, not replace the quote process.

Source Notes

Existing OminiPCB repository content (internal): May seed structure and internal links; engineering claims still need external verification when specifications are involved.
Public research required before generation (research_placeholder): Blocks publication until replaced by specific trusted sources.

Data provenance: pending_source_review; schema_seed_not_market_data. Customer data stored: false.

CTA

Request a PCB quote when the manufacturing files and quote assumptions are ready for engineering review.

Engineering Decision Guide

The correct surface finish is determined by the complete manufacturing flow, not by a single price comparison. Start with the pad geometry, component pitch, contact or soldering function, storage interval, number of thermal cycles, and the inspection method. A finish that looks attractive on a bare-board quotation can become the wrong choice when boards wait in a warehouse, pass through rework, or require a flat pad for a fine-pitch package.

For 4-Layer ENIG PCB Cost Reference, review these questions before releasing the fabrication drawing:

1. Will the surface be soldered, used as an electrical contact, or exposed to wire bonding? 2. How long can the bare board remain packaged before assembly begins? 3. Will the assembly process include double-sided reflow, selective soldering, or rework? 4. Does the design contain fine-pitch QFN, BGA, edge contacts, or exposed thermal pads? 5. What evidence will the supplier provide for finish thickness, solderability, cleanliness, and lot traceability?

Flatness and oxidation protection are different properties. A very flat finish can support stencil printing while offering less tolerance for poor storage or repeated heating. A thicker metallic finish can offer a larger handling window but may introduce pad-height variation, nickel-related considerations, or higher cost. Therefore, the drawing should name the required finish and the acceptance evidence instead of saying only “lead-free” or “RoHS.”

RFQ and Incoming-Inspection Checklist

State the finish name and any applicable IPC finish specification.
Identify critical pads, contact fingers, or wire-bond areas separately.
Define packaging, moisture protection, and maximum fabrication-to-assembly interval.
Ask for a process certificate or lot record when the application has reliability or traceability requirements.
Confirm whether the selected finish is compatible with the planned solder alloy, reflow profile, and rework sequence.
Inspect representative pads for discoloration, exposed copper, nodules, scratches, contamination, and solderability concerns.

Common Failure Modes

Most finish problems originate at the boundary between fabrication, logistics, and assembly. Fingerprints and humidity can damage a protective organic layer. Excessive thermal exposure can consume process margin. Poorly controlled deposition can create non-planarity or inconsistent solder wetting. The corrective action is rarely “change finish” alone: first separate handling, storage, process-profile, and board-design causes, then change only the variable that controls the failure.

For prototypes, record the chosen finish, date received, storage condition, first assembly date, number of reflow passes, and any rework. That small record makes the finish decision repeatable when the design moves to production.

FAQ

Which finish should be the default?

There is no universal default. Choose the least complex finish that satisfies pad geometry, storage, soldering, contact, reliability, and cost requirements.

What should be written in the RFQ?

Name the finish, critical pad areas, inspection evidence, packaging expectations, and allowed alternatives. Do not leave the decision to an unqualified material substitution.

How can a supplier comparison be made fair?

Compare the same copper thickness, board class, pad definition, finish requirement, packaging, test scope, and delivery assumptions. Otherwise the cheapest quote may simply omit a requirement.