From the above factors, it specifically involves the following parts:
Tg value (glass transition point temperature of the material); (Considering lead-free compatibility).
Td value or T260, T288 (thermal decomposition temperature of the material); (Considering lead-free compatibility).
Er value and Tan δ (Dk and Df) (dielectric loss and dielectric loss tangent);
Halogen content (is it a halogen-free material?)
Other factors to consider: CAF, IST, Q1000, CTI (Leak Trace Index), water absorption rate, etc.
Alternative materials for Isola PCB materials
Now let's talk about which materials can replace Isola materials in PCB production based on the specific factors mentioned above, to help you choose materials or provide assistance when encountering material shortages.
1. Common substitutes for materials with a focus on TG values
Isola PCL-370HR and FR-406 have similar TG values to the following materials:
S1141： Gradually phased out.
S1170： At present, the mainstream is to use TG 170-180 material.
S1000-2： High Td TG 170-180 material, further upgrade of S1170.
IT180： The performance is close to S1000-2.
N4000-6: NELCO product, with performance close to S1141 170.
The TG of the above materials are all TG170 to TG180, so S1170 can be used instead.
2. Common material substitution with TD value as the focus
PCL-370HR material can be replaced by S1170 material, with a focus on TD value. The comparison between the two materials is as follows:
Both materials are suitable for lead-free soldering processes, with a TG difference of 5 ℃ and a thermal decomposition temperature that meets the requirements of IPC lead-free soldering process materials. The Z-axis expansion coefficient is also close, and DK and DF are also close, so the overall performance is similar and can be replaced with each other without any negative effects.
But the procurement cycle of PCL-370HR is about two weeks, and the material cost is almost twice that of S1170.
3. Common substitutes for materials with a focus on Dk and Df values
Isola FR408, Isola Getek, and Isola IS620 are high-performance materials with similar Dk and Df values to the following materials:
Isola FR408: Dk=3.7Df=0.010Tg=180 ℃
Isolag Tech: Dk=3.9 Df=0.010 Tg=180 ℃
Nelco N4000-13: Dk=3.7 Df=0.009 Tg=210℃
Nelco N4000-13SI: Dk=3.4 Df=0.008 Tg=210℃
Isola IS620: Dk=3.4 Df=0.008 Tg=210℃
The Dk and Df values of all the above materials are similar, so they can be replaced with the substitute Nelco N4000-13.
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