Technical Guides
At O-Leading, we believe informed engineers make better products. Our Technical Guides Library condenses years of hands-on PCB and PCBA manufacturing knowledge into practical, field-tested references — covering design rules, material selection, fabrication processes, and assembly quality. Whether you’re prototyping your first board or scaling a mission-critical design, these guides help you move forward with confidence.Technical Guides Built on Real Manufacturing Experience
New to O-Leading? Visit our homepage for our PCB/PCBA capabilities and solutions. ENIG for flatness and BGA assembly, ENEPIG for wire bonding, OSP for cost-sensitive boards, HASL for low-cost soldering — this guide breaks down finish chemistry, application fit, and shelf-life impact so you can choose with confidence. From allowable annular ring targets to solder joint criteria, learn the measurable differences between IPC Class 2 and Class 3 — and which applications (medical, aerospace, automotive safety) truly require the higher standard. Compare Any-Layer and 2+N+2 architectures, understand laser microvia aspect ratios and via-in-pad rules, and learn how to balance density, cost and yield — with real stack-up examples from production. A field-tested reference covering 4 to 44 layer stack-ups — plane allocation, controlled impedance planning, material selection (FR4, high-Tg, low-loss) and cost-efficient layer ordering for signal integrity. When to choose ENIG over ENEPIG and vice versa — covering wire bonding compatibility, connector wear resistance, black pad risk, and cost differences for high-reliability applications. Master 0.3mm pitch BGA assembly — from stencil design and reflow profiling to void control and X-Ray acceptance criteria — with practical inspection workflows for hidden solder joints. From vacuum resin plugging and staged cure to copper-cap plating and IPC-4761 Type VII inspection — the complete POFV workflow, DFM rules and failure prevention for HDI and BGA boards.Explore Our Capabilities
PCB Surface Finish Selection Guide
IPC Class 2 vs Class 3: How to Choose
HDI Design Handbook: Any-Layer vs 2+N+2
Multilayer Stack-up Design Reference
ENIG vs ENEPIG: Application Comparison
BGA Soldering & X-Ray Verification Guide
POFV Process Complete Guide: Plated Over Filled Via (VIPPO) Technology
