PCB Basics

Bare copper circuitry exposed on a PCB after the soldermask was removed, the starting point of controlled layer-by-layer analysis

PCB Reverse Engineering for Legacy Boards: Process and Limits

Gold-finished PCB rings and contact pads showing the uniform, mirror-bright deposit typical of an ENEPIG surface finish

ENEPIG Surface Finish: Pros, Cons and When to Specify It

Four cross-section photos of blind vias with copper filling voids of different shapes

Plating Voids in Microvias: Root Causes and How Factories Fix Them

Cross section of a conventional 4-layer PCB stackup: signal layers on the outers, ground and power planes inside, symmetric prepreg-core-prepreg press with a plated through via

4-Layer PCB Cost: What Drives the Price and How to Quote It Right

Eight-layer 3-stage HDI cross-section with stacked laser blind microvias drilled from both outer surfaces, a buried via through the core and a plated through hole

Blind and Buried Via HDI: Cross Via Structures for High-Density PCBs

Cross-section showing a silicon die, flip-chip bumps, the package substrate and BGA balls connecting to a motherboard PCB

Semiconductor Package Substrate Explained: Functions, Materials and Types

Exploded view of an IC package showing the die, ABF substrate and host PCB stack

ABF Substrate Explained: Build-Up Film, Fine Lines and FC-BGA

BT substrate memory package panels with gold-plated bonding pads in panel format

BT Substrate Explained: Properties, Applications and Selection

Cross section diagram of any-layer HDI with funnel-shaped laser blind vias stacked on landing pads, entries opening upward from the top surface and downward from the bottom surface, next to a mechanical through-hole

Why Advanced HDI PCB Manufacturing Is Hard: Microvias, Yield and Cost

Cross section of a 6-layer hybrid PCB stackup with the RF signal and ground pair on a low-loss laminate above FR-4 cores carrying the digital and power layers

Hybrid PCB Stackup Guide: Mixed Dielectric Materials, Cost and Uses

Transparent glass substrate panels with patterned gold interconnect traces, an example of glass-based circuit fabrication

Glass Substrate PCB Explained: Properties, TGV and Where It Fits

Comparison diagram of IPC-A-600 Class 1, Class 2 and Class 3 acceptance levels: typical products, defect tolerance, inspection depth and process discipline

IPC-A-600 Class 3 Explained: Requirements, Inspection and Cost Impact

Seven step outer layer PCB fabrication flow from copper prep and dry film imaging to pattern plating, etching and AOI inspection

Outer Layer PCB Fabrication: Pattern Plating to Final Etch

Four step diagram of PCB photoresist imaging: laminate dry film, expose through artwork, develop and etch to finished traces

PCB Photoresist Explained: How Circuit Imaging Actually Works

Six checkpoints from Gerber and stackup review to electrical test and AOI for an HDI panel, each producing a document a buyer can request

HDI PCB Manufacturer: How to Read a Factory’s Real Capability

Table relating IEC 60112 CTI voltage bands to UL performance level categories and IEC material groups, with the 600 V high CTI threshold marked

High CTI PCB Explained: Ratings, Creepage Rules and Material Choice

Layered PCB laminate construction showing copper foil, prepreg and core materials

PCB Laminate Selection Guide: From Standard FR4 to Low-Loss Materials

Multilayer PCB placed beside a calculator and a steel ruler, illustrating how per-area board pricing is measured

PCB Cost per Square Meter: How Quotes Are Built and Compared

Cross-section diagrams comparing 1-stage, 2-stage and 3-stage HDI stackups, with a legend for cores, prepreg, stacked laser microvias, buried vias and plated through holes

HDI Stages Explained: 1-Stage, 2-Stage and 3-Stage PCB Stackups

Components of PCB prices shown with a multilayer circuit board, quote documents and a calculator

Components of PCB Prices: A Practical Cost Guide for Engineers and Buyers