# **What is PCB?** # [PCB](jlcpcb.com/m) also is known as the Printed Circuit Board, is an important electronic component, the supporting body of electronic components, and the carrier of electrical connection of electronic components. Because it is made by electronic printing, it is called a "printed" circuit board. [JLCPCB](jlcpcb.com/m) is the first and the largest professional PCB prototype company in China, with $2 for 2L PCBs & $5 for 4L PCBs. There are kinds of PCB on market, according to their material, there are FR-4、CEM-1/3、FR-1、MBCCL, flexible board, etc, those boards are common in the market, but today I would like to introduce a kind of PCB infrequently used in normal electronic products. That called ceramics PCB.  # **1 What is Ceramics PCB?** # Ceramics PCB refers to a special process board in which copper foil is directly bonded to alumina (Al2O3) or aluminum nitride (AlN) ceramic substrate surface (single-sided or double-sided) at high temperature. According to process technology, it can be divided into LTCC, HTCC, DPC, DBC, or LAM, etc. # **2 What is the difference between Ceramics PCB and FR4 PCB?** # Different from traditional FR-4 (glass fiber), ceramic materials have good high-frequency performance and electrical properties and have high thermal conductivity, chemical stability, and thermal stability. Ideal packaging materials for generating large-scale integrated circuits and power electronic modules. # **3 Advantages of Ceramics PCB** # 3-1. Higher resonance rate 3-2. More matching thermal expansion coefficient 3-3. A kind of hard and resistive metal film alumina ceramic circuit board 3-4. The solderability of the base material is good, and the use temperature is high. 3-5. Good insulation 3-6. Low-frequency loss 3-7. Assemble with high density 3-8. No organic ingredients, resistance to cosmic rays, high reliability in aerospace, long continuous 3-9. The copper layer does not contain an oxide layer and can be used for a long time in a reducing atmosphere. # **4 The applications of Ceramics PCB** # ◆ High-power power semiconductor modules; semiconductor refrigerators, electronic heaters; power control circuits, power mixing circuits. ◆ Intelligent power components; high-frequency switching power supplies, solid-state relays. ◆ Automotive electronics, aerospace, and military electronic components. ◆ Solar panel components; telecommunications dedicated switches, receiving systems; industrial electronics such as lasers. Ceramics PCB actually has been in the market for many years, but not that popular as FR4, the most important reason is that the cost for ceramics PCB is much higher than FR4 and the manufacturing process is much difficult than FR4 boards.