For an optimal design-to-fabrication workflow, incorporate IPC-4101 guidelines into your engineering pipeline:
) halogen-free epoxy material, highly utilized for environmentally conscious consumer electronics. High-performance, high- Tgcap T sub g
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| Slash Sheet | Material Type | Typical Applications | | :--- | :--- | :--- | | | Standard FR-4, minimum Tg of 110°C (Glass Transition Temperature) | Consumer electronics, low-cost commercial products, and low-stress general-purpose boards. | | /24 | High Tg FR-4 (≥170°C), enhanced thermal and chemical resistance | Automotive electronics, industrial controls, and networking equipment that must survive lead-free assembly temperatures. | | /26 | FR-4 with enhanced flammability and moisture resistance | High-reliability applications requiring superior performance in humid environments. | | /126 | Very high Tg FR-4 (≥170°C) with excellent thermal reliability | Servers, telecommunications infrastructure, and any application subject to repeated thermal cycling. |
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Base materials act as the structural and electrical foundation of a PCB. They consist of:
Halogenated (brominated) vs. halogen-free systems. Thermal Properties: Glass transition temperature ( Tgcap T sub g ), decomposition temperature ( Tdcap T sub d ), and time to delamination ( Key Slash Sheets in Modern PCB Design IPC-4101/21: The classic standard- Tgcap T sub g | Slash Sheet | Material Type | Typical
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Modern specifications differentiate traditional brominated flame retardants from eco-friendly, halogen-free alternatives to meet global environmental mandates like RoHS. Evolution of the Standard: From FR-4 to Lead-Free
In simple terms, a printed circuit board is a sandwich of materials. The core "bread" is known as (often referred to as CCL, or copper-clad laminate), and the "glue" used to bond multiple layers together is called prepreg (a thin layer of reinforcing fabric pre-impregnated with a resin system). While these terms are commonly used, there is often significant variation in their properties between manufacturers.
Are there specific or impedance requirements ?