How to choose material for PCB
In order to meet the different requirements of the PCB board, From material selection, board design, to anti-jamming performance requirements , all aspects should make a reasonable choice and design, most of the time, ordinary FR4 will be able to meet the design requirements, but Some special boards need special material , and many times customer have specified board material , but for some reason we can not buy these material directly . In fact, we have the same similar performance board material instead .
The choice of board material needs to consider the manufacturability of the factory , the availability of materials, the cost and the applicability of laws and regulations.
Key data of the board material performance
• Tg value (glass transition point temperature of the material)
• Td value or T260, T288 (thermal decomposition temperature of the material)
• Er value and Tanδ (Dk and Df) (dielectric loss and dielectric loss tangent),
• Halogen content (whether halogen-free material),
• Other considerations: CAF (anode conductive wire), IST, Q1000, UL grade, CTI (leakage tracking index), Water absorption ….
Recommended board material
Performance | Material | Description |
Tg | Fr4 laminate | |
KB KB6160 | Tg =130 Td =305℃ | |
Shengyi S1141 | Tg =140 Td =325℃ Z-CTE(50-260 ℃)=4.5% | |
Shengyi S1170 | Tg =170 Td =335℃ Z-CTE(50-260 ℃)=3.3% | |
KB KB6167 | Tg =170 Td =340℃ Z-CTE(50-260℃)=3.0% | |
Td | Shengyi S1170 | Tg =170 Td =335℃ Z-CTE(50-260℃)=3.3% |
Dk And Df | Non-PTFE thermoset resin systems with ceramic loading | |
Nelco N4000-13 | Dk=3.7, Df=0.009 Tg=210 ℃ | |
Rogers 4003C | Dk=3.38, Df=0.0027 UL94VO | |
Rogers 4350B | Dk=3.48, Df=0.0037 UL94VO | |
Rogers RO4450B (3.9mil) | Dk=3.54, Df=0.004 UL94VO | |
Arlon 25FR | Dk=3.58, Df=0.0035 UL94VO | |
Arlon 25FR 1080 (3.9mil) | Dk=3.58, Df=0.0035 UL94VO | |
PTFE laminate (Teflon) | ||
Arlon Diclad 880 | Dk=2.17, 2.20, Df=0.0009 | |
Taconic TLY-5 A, TLY-5 | Dk= 2.17, 2.20 , Df=0.0009 | |
Arlon Diclad 527 | Dk=2.40-2.60, Df=0.0022 | |
Taconic TLX-8 | Dk=2.51-2.59, Df=0.0019 | |
Taconic RF-30 | Dk=3.0, Df=0.0014 | |
Arlon AD300 | Dk=3.0, Df=0.003 | |
Taconic RF-35, RF-35P | Dk=3.50, Df=0.0018, 0.0025 | |
Arlon AD350, AD350A | Dk=3.50, Df=0.003 | |
Arlon AD1000 | Dk=10.20, Df=0.0023 | |
Taconic CER-10 | Dk=10.00, Df=0.0035 | |
Halogen Free | Shengyi S1155 | Tg= 135℃, Td =370℃ |
Shengyi S1165 | Tg= 170℃, Td =360℃, | |
KB HF-140 | Tg= 130℃, Td =340℃, | |
CTI | Shengyi S1601 | CTI 400-600V Tg= 135℃ Td =310℃ |
Shengyi S1600 | CTI ≥600V Tg= 135℃ Td =310℃ | |
KB KB6160C | CTI 300V/600V Tg =130 Td =305℃ |