Why the Manufacturing Package Matters
A PCB manufacturer can only build what is communicated. The release package must transfer design intent without relying on assumptions.
- Design Intent — Complete and verified design data
- Controlled Release — One controlled package with defined revision
- CAM & DFM Review — Manufacturing analysis and feedback
- Fabrication — Build to intent with controlled processes
- Inspection & Test — Verification and evidence of quality
Core Principle: Manufacturing data, fabrication drawing, stack-up, notes and purchase-order requirements must tell the same story.
What a Good Package Achieves
- Controls part number and revision
- Defines image, drill, mechanical and fabrication data
- States materials, thickness, copper and surface finish
- Identifies impedance structures and test requirements
- Defines all special processes
- States acceptance evidence and documentation
- Enables engineering queries before production
| Minimum | Production-Ready | High-Reliability |
|---|---|---|
| Gerber/ODB++ • Drill data • Outline • Basic notes | Data • Drawings • Stack-up • Impedance • Netlist • Clear notes | Production-ready package plus standards • Coupons • Reports • Traceability • Change control |
| Simple prototypes and low-risk boards | Repeat production and industrial designs | Defence, aerospace and mission-critical products |
One controlled zip archive • One part number • One revision • No piecemeal releases
Release Contents • Data Formats • Layer Set
Agree one primary manufacturing-data format with the fabricator and identify it as the manufacturing master.
| Item | Detail |
|---|---|
| 01 | 01_FAB_DATA |
| 02 | 02_DRILL_ROUTE |
| 03 | 03_DRAWINGS |
| 04 | 04_STACKUP |
| 05 | 05_IMPEDANCE |
| 06 | 06_NETLIST |
| 07 | 07_SPECIFICATIONS |
| 08 | 08_README |
Format Selection
- Gerber — Modern attributed image data
- Odb++design — Intelligent structured manufacturing data
- IPC-2581 — Intelligent neutral exchange when supported
Do Not Create Multiple Masters: If several formats are supplied, explicitly identify the controlling data set.
Recommended Layer Set
- Copper — Top, all internal layers, bottom
- Solder mask — Top and bottom
- Legend — Top and bottom as required
- Profile — One authoritative finished outline
- Drill — PTH, NPTH and special structures
- Job / attributes — Include when generated
Paste data is normally assembly data—do not confuse it with solder mask.
Fabrication Drawing • Stack-up • Impedance
The fabrication drawing is the human-readable contract for the bare board; the stack-up is both a mechanical and electrical definition.
Fabrication Drawing — Define
- Part number, PCB name and revision
- Finished dimensions, datum and tolerances
- Finished thickness and layer count
- Material and copper requirements
- Surface finish, solder mask and legend
- PTH, NPTH, slots and special holes
- Impedance table and controlled layers
- Backdrill, via fill, edge plating and press-fit
- Standard, class, electrical test and coupons
- Marking, serialisation and traceability
Stack-up — For Each Layer
- Layer number and functional name
- Signal, plane or mixed-layer function
- Starting / finished copper
- Core, prepreg and dielectric thickness
- Laminate family and electrical properties
- Copper foil type where performance-critical
- Associated impedance structures
- Sequential lamination or HDI cycles
| Net / Class | Pcie_tx • 1000BASE-T • Lvds_clk • RF_50R |
|---|---|
| Target | 50 Ω single-ended • 90 Ω or 100 Ω differential |
| Tolerance | Define project requirement |
| Layer | Identify signal and reference planes |
| Geometry | Trace width and differential spacing |
| Coupon / report | State coupon and TDR requirements |
High-Speed Caution: Verify dielectric thickness, copper thickness, roughness assumptions, solder-mask influence and the manufacturer’s Dk model—not trace width alone.
Any manufacturer-proposed stack-up must preserve electrical, mechanical, material and reliability constraints and receive formal approval.
Drills • Mechanical • Materials • Electrical Test
01 Drill
- Separate PTH and NPTH data
- State finished-hole size and tolerance
- Separate blind, buried, laser and controlled-depth drills
- Identify via-in-pad, filled, capped, plugged or tented vias
- Define backdrill start, stop, target stub and tolerance
- Define press-fit finished-hole requirements
- Identify plated and non-plated slots
- Do not pre-compensate drills for plating unless agreed
Tented • Plugged • Filled • Resin-filled • Capped • Plated-over are not interchangeable
02 Mechanical & Profile
- One authoritative board outline
- Units and coordinate origin
- Slots, cut-outs, radii and edge tolerances
- V-score, tab-route and breakaways when controlled
- Bevels, gold fingers and connectors
- Edge plating and castellations
- Critical connector-to-edge and mounting tolerances
03 Material & Surface Finish
- Define FR-4, high-Tg, low-loss, RF or polyimide requirements
- Control Tg, Td, Dk/Df, CAF, moisture and compliance where relevant
- Specify ENIG, ENEPIG, immersion silver/tin, OSP, HASL or hard gold
- Define selective finish and thickness where critical
04 Netlist & Electrical Test
- 100% electrical test requirement
- Independent IPC-D-356 netlist where practical
- Continuity and isolation criteria
- Flying-probe, fixture or agreed method
- Required report or certificate
A test against CAM data regenerated from the same incorrect interpretation may confirm consistency—not design intent.
Quality Evidence • Revision Control • Release Verification
Quality Evidence — Define Before Quotation
| Item | Evidence |
|---|---|
| Certificate of Conformity | Part • Revision • Lot • Applicable specification |
| Electrical test | Pass confirmation or agreed report |
| Controlled impedance | TDR / coupon report |
| Microsection | Cross-section images and measurements |
| Material traceability | Laminate / prepreg certificate or lot |
| Dimensional inspection | FAI or critical-dimension report |
| Surface finish | Thickness report when required |
| Solderability / cleanliness | Process or laboratory report |
| Lot traceability | Date code, lot, traveler or production record |
Readme & Revision Control
- Customer / project
- PCB part number and revision
- Release date and purpose
- Primary manufacturing-data format
- Included files and folders
- Drawing and stack-up revision
- Special processes and critical requirements
- Reports, certificates and approved deviations
- Engineering contact
Example Package Name: Np-12345_REV-c_pcb-FAB_2026-08-12.zip
Never overwrite an old release using the same filename.
Independent Pre-Release Verification
- View final exported data independently
- Review drill sizes and via treatments
- Verify layer count, order, polarity and alignment
- Check legend and solder-mask openings
- Overlay copper, mask and drills
- Compare drawing, stack-up and impedance data
- Check outline, slots and cut-outs
- Confirm netlist and final ZIP contents
- Confirm PTH / NPTH separation
Two-Source Verification: Compare critical information using independent sources wherever practical.
Common Mistakes • DFM Control • Final Checklist
| Mistake | Better Practice |
|---|---|
| Conflicting outlines | Provide one authoritative profile |
| Generic layer names | Use attributes and a clear stack-up |
| Missing NPTH distinction | Separate plated and non-plated data |
| Impedance note without structure | Provide targets, layers, geometry and tolerance |
| No press-fit hole tolerance | Define finished hole and tolerance |
| Material stated only as FR-4 | Define performance or approved material |
| Contradictory revisions | Use one controlled release archive |
| Special process only in email | Place it in controlled data and drawings |
| No independent output review | Review final manufacturing outputs |
| Unclear acceptance documents | Define evidence at RFQ / PO stage |
- Part number and revision agree everywhere
- Primary manufacturing format identified
- Copper, mask, legend, profile and drill data complete
- Fabrication drawing and stack-up current
- Materials, thickness and finish defined
- Impedance targets and coupons defined
- Special processes fully specified
- Standards, class and electrical test defined
- Reports, certificates and traceability defined
- Exported data independently checked
- Final ZIP opened and verified
- Manufacturer instructed to raise queries before changes
- Manufacturer raises a numbered item
- Technical impact is assessed
- Proposed change is checked against requirements
- Customer approval is obtained where required
- Response is recorded against the job revision
- Production starts only after critical items close
No silent changes to stack-up, trace geometry, finished holes, material, surface finish or other controlled features.
Remove uncertainty • Control the data • Qualify the fabrication route • Preserve objective evidence