NP-155FR Dk and Df
Nan Ya NP-155FR: Dk 4.2–4.4 and Df 0.014–0.016 at 1 GHz (Middle of the datasheet ranges (Dk 4.2–4.4, Df 0.014–0.016), 0.062" laminate). In the pcbplanner material library it is listed under standard fr-4 materials, with a glass transition temperature of 155 °C.
Datasheet values
| Entry | Dk | Df | at | Tg | Construction and test method |
|---|---|---|---|---|---|
| NP-155FR | 4.3 | 0.015 | 1 GHz | 155 °C | Middle of the datasheet ranges (Dk 4.2–4.4, Df 0.014–0.016), 0.062" laminate. |
Dk and Df depend on the glass style, the resin content and the test method, so the same product has different values in different constructions. Compare materials at the same frequency and, where possible, with the same method; for a construction not listed here, use the manufacturer’s construction table.
Dk and Df from 1 to 20 GHz
The datasheet gives one frequency. The table extends that point with the Djordjevic–Sarkar wideband Debye model, the same model the impedance and trace-loss calculators use: it keeps Df nearly flat and lets Dk fall slowly with frequency. These are model values, not measurements.
| Entry | 1 GHz | 2 GHz | 5 GHz | 10 GHz | 20 GHz |
|---|---|---|---|---|---|
| NP-155FR | 4.30 / 0.015 | 4.27 / 0.015 | 4.23 / 0.015 | 4.21 / 0.015 | 4.18 / 0.014 |
Each cell is Dk / Df.
Use it in a calculation
Similar materials
- Isola 370HR – Dk 4.04 and Df 0.021 at 2 GHz
- Shengyi S1141 – Dk 4.4 and Df 0.013 at 1 GHz
- Shengyi S1000-2M – Dk 4.6 and Df 0.018 at 1 GHz
Other datasheet pages: Panasonic MEGTRON 6 · Panasonic MEGTRON 4 · Panasonic MEGTRON 7 · Rogers RO4350B · Rogers RO4003C · Rogers RO3003 · Rogers RT/duroid 5880 · Isola FR408HR · Isola I-Speed · Isola Tachyon 100G · TUC TU-872 SLK · DuPont Pyralux AP · DuPont Pyralux HP · Taiyo PSR-4000 solder mask
Sources
- Nan Ya NP-155F data sheet (rev. 2025-10-27). NP-155FR: Dk 4.2–4.4, Df 0.014–0.016 at 1 GHz (2.5.5.9, 0.062" laminate); Tg 155 °C. The library uses the middle of each range.