JLCPCB Blog

Basics & Tips

The Complete Guide to Transformer Symbol: Meaning, Types, Diagram, and PCB Applications

Transformers are fundamental components in power electronics, used for voltage conversion, electrical isolation, impedance matching, and signal coupling. Because of this, the transformer symbol is widely used in circuit schematics for power adapters, SMPS circuits, audio systems, communication interfaces, and industrial electronics. If you've ever confused it with an inductor symbol or ignored those mysterious dots, this is the transformer symbol explained for you. In this guide, you will learn: Trans......

May 13, 2026

Assembly Techniques

Chip Scale Package (CSP) Explained: Types, Benefits & More

Open any flagship smartphone motherboard and the ICs look almost like bare silicon - no chunky leads, no oversized housings. That is chip scale packaging in action. By definition, a chip scale package (CSP) is an IC package where the total body area is ≤1.2× the die size, adhering to rigorous JEDEC and IPC standards. This design philosophy translates directly into smaller boards, shorter signal paths, and superior electrical performance, which is why CSPs now ship in everything from wireless earbuds t......

May 13, 2026

PCB Materials Science

How Laser Drilling Delivers Precision and Density in Advanced PCB Manufacturing

Key Takeaways Laser Drilling has become the cornerstone technology for precision and high-density PCB manufacturing, enabling microvias as small as 25-75μm — far beyond the 150μm limit of mechanical drilling. By delivering superior accuracy, contactless processing, excellent signal integrity, and reliable blind/stacked vias, it empowers advanced HDI board designs essential for modern electronics. From optimal stackup selection to professional plating and DFM practices, mastering laser drilling is key ......

May 13, 2026

Design for Manufacturing

Implications of border lines and 3D footprint lines on Mechanical Layer 1

Key Takeaways Mastering Mechanical Layer 1 is essential for accurate PCB manufacturing. Always place the complete board outline, mounting holes, and irregular slots on Mechanical Layer 1 (GM1), as JLCPCB prioritizes the lowest-numbered Mechanical Layer while ignoring KEEP-OUT and higher Mechanical Layers. 3D footprint lines serve only as design references and will not be fabricated. Following these layer priority rules and best practices ensures correct board dimensions, proper slot formation, and avo......

Sep 20, 2023

Basics & Tips

PCB vs PCBA: What Are the Differences and How to Choose the Right Service for Your Project

In the electronics industry, PCBs and PCBAs are frequently confused with one another, but the two represent distinct stages in the hardware production sequence. Engineers and product designers need to maintain a clear distinction between the meaning of a bare Printed Circuit Board (PCB) and a fully assembled Printed Circuit Board Assembly (PCBA). So here’s the deal: A PCB is a blank board—etched copper, no components. A PCBA is a fully assembled board—ready to test, ready to ship. The distinction is i......

Sep 29, 2025

Components & Sourcing

What Is System in Package? Architecture, Benefits, and Applications in Modern Electronics

System in Package (SiP) is a semiconductor packaging approach that combines multiple ICs, passive components, and interconnects inside a single package, delivering a complete functional subsystem in the footprint of one component. SiP has become a foundational technology in smartphones, wireless modules, wearables, and IoT devices. It lets engineers integrate a processor, memory, RF circuitry, and power management into one compact, pre-tested unit, reducing board complexity and shortening time to mark......

May 12, 2026