Ultra-low transmission loss Circuit board materials for IC substrate/Module | R-G545L, R-G545E

Ultra-low transmission loss Circuit board materials for IC substrate/Module R-G545


  1. Excellent low-Dk/Df with low CTE property for the evolution of device.
  2. Stable signal values at high frequency and high temperature and humidity.

Circuit Board Materials

  • Part Number

Low Dk glass cloth

Laminate R-G545L
Prepreg R-G540L

Normal glass cloth

Laminate R-G545E
Prepreg R-G540E

  • Application
  • Detailed use
IC PKG for base station application, Module part, etc.

New branding announcement

  • Panasonic Electronic Materials Division launches LEXCM brand Semiconductor Device Materials.
    The LEXCM brand now comprises all of the Semiconductor Device Materials; IC packaging materials (which includes substrates, encapsulants and underfills) and electronic assembly materials.
    Additionally, the IC substrate materials' brand is transitioning from MEGTRON GX to LEXCM GX.


Dk 3.5 Df 0.003
CTE x,y-axis 10ppm/°C
CTE z-axis 22ppm/°C
Tg (DMA)

Df at Wide-frequency band

Df at Wide-frequency band

Frequency dependence by Transmission loss

Frequency dependence by Transmission loss





General properties

Item Test method Condition Unit LEXCM GX
Low Dk glass cloth
Normal glass cloth
Glass transition temp.(Tg) DMA* A °C 230 230
CTE x, y-axis α1 Internal method A ppm/°C 10 10
CTE z-axis IPC-TM-650 2.4.24 22 22
Dielectric constant(Dk) 12GHz Balanced type circular disk resonator A 3.5 4.0
Dissipation factor(Df) 0.003 0.004
Water absorption IPC-TM-650 D-24/23 % 0.06 0.06

The sample thickness is 0.1mm
* Measurement in tensile mode

Our Halogen-free materials are based on JPCA-ES-01-2003 standard and others.
Contain; Chlorine:≤0.09wt%(900ppm), Bromine:≤0.09wt%(900ppm),

The above data are typical values and not guaranteed values.

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