Fine-Pitch BGA Escape
Use microvias and finer geometry when through-hole fan-out consumes routing channels or blocks power and ground access.
High-density interconnect manufacturing
HDI PCB Manufacturing for Dense Interconnects
EBest PCBA reviews laser microvias, blind and buried connections, fine-line routing and via-in-pad features for compact PCB builds. Send your stack-up, via specifications and board files to confirm the fabrication structure and quotation scope.
We aim to provide an initial engineering response within 24 hours. Construction, pricing, test requirements and production lead time are confirmed from the design files.
HDI BUILD-UP1+N+1 / 2+N+2 / 3+N+3Build-up and via structure reviewed for your design.
ADVANCED INTERCONNECTSAny-Layer HDIConstruction and availability confirmed by project review.
LASER MICROVIAS0.10 mmVia size and dielectric depth reviewed together.
VIA-IN-PADVia-in-Pad PlatedFill, planarization and cap plating by review
Start with the design constraint
When Should You Choose HDI for Your PCB?
HDI affects the stack-up, drilling sequence, registration, copper balance, and cost, so it should be considered before the layout is finalized.
Smaller Product Envelope
Reduce board area while balancing layer count, dielectric thickness, routing density, and reliability.
Blind or Buried Interconnect
Move selected connections between layers while controlling drill depth, target land, plating and sequential lamination requirements.
Via-in-Pad Requirements
Review fill, planarization, cap plating, pad size, and assembly requirements before approving the VIPPO structure for fabrication.
Construction selection
HDI Build-Up Options
Each additional build-up cycle adds process time and tighter registration requirements. EBest PCBA confirms the required structure from the layer connectivity, via map, and approved stack-up.
Build-Up Structure
Required layer transitions determine the number of laser-drilling and lamination cycles. Cost and lead time depend on the final build-up structure.
Standard structures and items requiring additional review are identified before quotation.1+N+1 HDI
One build-up layer on each side of the core structure, with the via map approved. N denotes the core-layer structure.
2+N+2 HDI
Two build-up layers on each side where additional transitions are required, subject to stack-up and process review.
Any-Layer HDI
Selected layer-to-layer structures subject to complete connectivity and process evaluation.
HDI Capability Review From Your Production Files
HDI PCB Manufacturing Capabilities
The stack-up, via map and copper define the approved HDI construction. The references below are evaluated as a complete build.
| Capability | Production Reference | Conditions / Special Review |
|---|---|---|
| Laser microvia | 0.10 mm reference | Hole-size definition, dielectric depth, aspect ratio, capture pad and plating or fill confirmed. |
| Finished mechanical hole | 0.20 mm minimum reference | 0.15 mm by review; board thickness, plating and tolerance confirmed. |
| Inner line width / spacing | 4 / 4 mil at 0.5–1 oz copper reference | 3 / 3 mil by review; base and finished copper, etching and layer-specific geometry confirmed. Outer layers assessed separately. |
| Through-hole aspect ratio | Up to 8:1 reference | Up to 10:1 by review; hole size, thickness and plating must form an approved combination. |
| HDI build-up | 1+N+1 after stack-up review | 2+N+2, stacked or staggered microvias and Any-Layer by project evaluation. |
| Total layer count | Defined by the approved HDI stack | Build-up layers, core structure, registration and lamination sequence determine the construction. |
| Via-in-pad / VIPPO | Selected filled, planarized and capped structures | Via type, copper or specified fill material, cap plating, pad flatness and assembly requirements confirmed. |
| Surface finish | Selected for the approved assembly interface | OSP, ENIG, silver or tin; HASL where pad flatness permits; ENEPIG or hard gold by review. |
| Controlled impedance | Target and tolerance agreed from the stack-up | Material data, dielectric thickness, finished copper, reference planes, coupons and testing confirmed. |
Line width and spacing are separate dimensions. A 0.10 mm microvia reference does not determine allowable depth or stacked-via qualification. The quotation confirms the complete construction and inspection or reliability scope. For conventional layer options, see FR4 and multilayer PCB capabilities.
Not sure whether your stack-up needs HDI?
Send Gerber or ODB++ files, the via map, and BGA pitch. EBest PCBA will confirm which features are within standard capability and which require additional review before quotation.
Check My HDI Stack-Up
HDI Manufacturing Process
HDI Manufacturing and Inspection
The exact process depends on the approved build-up, materials, and inspection plan. Each lamination and drilling cycle is checked against the approved stack-up and via structure.
Stack-Up and Via Map
Check layer connectivity, microvia depth, target lands, copper and impedance requirements.
Lamination and Laser Via
Control dielectric, laser depth, target lands and registration for each build-up cycle.
Metallization and Fill
Metallize and plate the approved interconnections. Apply specified microvia copper fill or selected mechanical-via resin fill according to via type, with planarization and cap plating where required.
Imaging and Etching
Protect fine geometry, copper balance and impedance-critical routing through production.
Surface and Assembly Interface
Confirm ENIG, OSP or project-specific finish against BGA, via-in-pad and soldering needs.
Inspection and Test
Complete electrical testing and agreed dimensional, microsection and final inspection. Qualification tests follow a separately agreed plan.
Engineering and inspection evidence
Microvia and Via-in-Pad Verification
Confirm target-land interfaces, specified copper fill, registration and cap-plated pad requirements. Mechanical-via resin fill and cap plating are defined separately from microvia copper fill.
DFM and Stack-Up Check
Review missing inputs, drill definitions, via-to-pad geometry, copper weight and the build sequence before quotation.
Registration Control
Confirm target-land access, annular relationships and layer alignment through the sequential build-up.
Microsection Evidence
Microsections assess specified plating, fill and interfaces. Reflow, thermal-stress and other reliability qualification require agreed coupons, methods and acceptance criteria.
Electrical and Impedance Test
Perform electrical testing and impedance verification against the approved data and coupon plan.
Supported HDI constructions
HDI Builds We Support
Match your BGA escape, signal-integrity and assembly requirements to the construction profiles below. Each build follows an approved stack-up and via map.
FINE-PITCH ROUTING
Fine-Pitch Processor Boards
Microvia fan-out assessed with BGA pitch, capture pads and routing channels.
Typical application: compact processing modules, embedded controllers and dense computing interfaces.
- Build-up
- 1+N+1 reference; final layer transitions follow the approved via map.
- Microvia
- 0.10 mm general reference; dielectric depth and capture-pad geometry remain file-specific.
- Key review
- BGA escape, stack-up, finished copper, impedance notes and assembly interface.
- Production basis
- Approved stack-up, drill data, review items, and inspection plan.
SIGNAL INTEGRITY
Controlled-Impedance Communication Boards
Reference planes, dielectric data and layer transitions aligned with the impedance plan.
Typical application: network processors, communication modules and high-speed control equipment.
- Build-up
- Compare 1+N+1 and 2+N+2 based on required layer transitions and routing density.
- Impedance
- Trace geometry, dielectric values, copper and reference planes reviewed together.
- Verification
- Coupon, electrical test and microsection evidence when required by the approved construction.
- Production basis
- Approved impedance table, stack-up, via structure, and production test plan.
COMPACT CONTROL
Compact Control Boards
Material, power routing and fine geometry selected for the assembly and service requirements.
Typical application: industrial controllers, compact instrumentation and high-temperature electronics.
- Material
- High-Tg FR-4 grade selected against assembly profile and operating conditions.
- Geometry
- Layer-specific copper and line/space limits checked before stack-up commitment.
- Evidence
- Registration, dimensional, and electrical records, plus any required inspection records.
- Production basis
- Approved fabrication data, material selection, and inspection plan.
Industry applications
Applications for Dense Interconnects
Telecommunications
Compact processors and communication interfaces with signal-integrity requirements.
Medical Electronics
Compact sensing or monitoring modules with defined documentation needs.
Automotive Electronics
Selected sensing and control boards with defined thermal and mechanical requirements.
Industrial Control
Dense embedded controllers and communication assemblies.
Prepare a quote-ready review
What to Send for an HDI PCB Quote
Send your available design data, stack-up and via map. We will identify missing information, review the required build structure and confirm the quotation scope.
Gerber or ODB++ dataNC drill and laser-via filesProposed stack-upImpedance requirementsVia type and fill notesFinished copper requirementsSurface finish and assembly notesQuantity and delivery target
Request Your HDI PCB Quote
Share the files you have. Our team will review the stack-up, microvias, copper and assembly requirements, then confirm the next steps for pricing and production.
FAQ
HDI PCB Manufacturing Questions
How do blind vias, buried vias and microvias differ?
Blind vias connect an outer layer to internal layers. Buried vias connect internal layers without reaching either surface. Microvias are small-depth interconnects commonly formed by laser. Geometry and layer transitions are defined in the approved stack-up.
How do I choose an HDI build-up?
The via map, BGA escape, layer transitions and reliability requirements determine the construction. Additional build-up layers affect processing, registration, cost and qualification needs.
Can you review via-in-pad and VIPPO?
Yes, subject to file review. Send the via type, pad size, hole definition, fill, cap plating, surface finish and assembly requirements. Via-in-pad placement alone does not mean the via is filled and plated over.
What line width and spacing can be reviewed?
For 0.5–1 oz inner copper, 4/4 mil is the reference and 3/3 mil requires review. Outer-layer and different-copper geometry must be confirmed separately.
What files are needed for an HDI quote?
Send circuit data, drill and laser-via definitions, stack-up, via map, copper, impedance, finish, dimensions, quantity and any assembly or inspection requirements. Partial information can start a review.
How are stacked and staggered microvias evaluated?
The review covers dielectric depth, target pads, copper fill, interfaces, registration and build sequence. Qualification requirements are agreed for the actual structure rather than assumed from a generic via dimension.
Can HDI fabrication be combined with turnkey PCBA?
Yes, subject to project scope. Send the BOM, placement data and test requirements so via-in-pad, finish, assembly and testing can be coordinated.