PCB Board Classification
Posted:10:40 AM August 26, 2021
writer: louise
PCB Board performance introduction and selection
We can classify the PCB by resin type of sheet and TG of the sheet.
1. Classification of resin type of sheet
- 1. Phenolic resin (Phenolic), FR2, low-grade board, generally single-sided, used for ordinary consumer electronic products.
- 2. Epoxy, such as FR4 series S1141, IT180A, is used for general consumer electronics, products, and industrial control electronics
- 3. Polyimide resin (Polyimide, PI), such as 85N, is used in electronic products with better heat resistance.
- 4. Polytetrafluorethylene (Polytetrafluorethylene, referred to as PTFE or called
- TEFLON), such as RT5880.
- 5. Bismaleamide triazine resin (abbreviated as BT)
- Such as Mitsubishi CCL-HL832HS
- 6. Cyanide Ester (abbreviated as CE)
2. Classified according to the Tg of the sheet
- 1. Ordinary Tg sheet: 130 ~ 140℃
- 2. Medium Tg sheet: 150~160℃
- 3. High Tg sheet: ≥170℃
- 4. Ultra-high Tg sheet: 250-260℃
- a. Polyimide resin materials are mainly used in aerospace, oil drilling, military industry and other fields that require very high reliability;
- b. Arlon 85N 33N
- c. VT-901
- d. The price of Tenghui board is relatively cheaper than Arlon.
3. Main considerations for material selection
- 1. The availability of materials in a timely manner; such as the procurement cycle and the time when the product is put into use.
- 2. PCB manufacturability; whether the required board is suitable for the existing craftsmanship.
- 3. Reliability of resistance to lead-free soldering;
- 4. Cost factors; customer R&D expenditure and cost control.
- 5. Applicability of laws and regulations, etc.; whether it conforms to RoHS, UL, etc. Considering the above factors specifically involves the following aspects:
- a. Heat resistance of Tg, Td, and small pitch;
- b. Dk and Df (dielectric constant and dielectric loss)
- c. Halogen content (whether it is a halogen-free material)
- d. Other considerations: CAF resistance, CTI value, CTE, water absorption, etc.
4. The rules of conventional sheet selection
- 1. Td requirement≥340℃: IT180A, TU-768
- 2. Dk≤3.5, Df≤0.01: select high-performance FR-4, PTFE, non-PTFE, BT
- 3. Halogen-free materials: medium Tg S1150G, IT-158; high Tg: S1165, IT-170GRA
- 4. Plates with CTI requirements
- 5. High-speed material classification
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