LTCC GREEN SHEETP5 Glass-ceramic green sheets for LTCC substrates
LTCC stands for "Low Temperature Co-fired Ceramics," a ceramic that can be co-fired with conductors atlower temperatures than common alumina. In addition to green sheets, we also handle as-sinteredboards without wiring patterns and other materials. By carefully listening to customer needs andproposing optimal product types and sizes, we can respond to a wide variety of demands, including
product miniaturization, low profile, high frequency compatibility, and improved productivity.

LTCC Green Sheets
LTCC Green Sheets are made by mixing alumina powder andglass powder and forming them into sheets. Our green sheets
offer low shrinkage ratio deviation (<±0.3%) and highprintability (L/S: 50μm/50μm), enabling high-density, highprecision machining. In addition, various features can beprovided by changing the characteristics of each powder andthe balance of mixing, so we propose an optimal design to suit
your needs.

Green Sheets of Glass/Ceramics Powders
In addition to LTCC, we also support sheet processing ofceramic powder and glass powder. It is possible to form sheetsof various materials such as alumina, zirconia, cordierite, andglass, so please feel free to consult us.

Alumina Substrates(Al2O3 Substrates)
Our alumina substrates are products with excellent flatness andsurface smoothness (Ra=about 0.1). Due to durable against
repeated heating, it is used in a variety of applications. We offer
a wide range of substrates with thicknesses of about 80μm to1mm and a maximum size of about □270mm. It can also bemachined into a particular shape, such as a disc.

●Features
Custom designsupport

Our green sheets are customizable in size and thickness, shrinkage rate,
coloring, various physical properties, and product form (rolls or pieces). We
offer a wide range of solutions on request, including proposals for colors andoptimal metal paste.

Available forsmall lot orders

Both standard and custom products can be provided, from small quantities
such as tens sheets for prototypes to mass production.

EnvironmentallyFriendly

All of our green sheets are environmentally friendly products (for example,lead-free, and so on).

Contact Information
New Product Development Department
4207 Ikonobecho, Tsuzukiku, Yokohama, 224-0053 Japan
URL：https://www.yama-ph.co.jp/en/contact/ (Inquiry form)
This products information is subject to changed or updated without notice.

Oct. / 2021 Ver.1

LTCC GREEN SHEETP5 Glass-ceramic green sheets for LTCC substrates
Yamamura Photonics offers green sheets with various features as standard products. Refer to the tablebelow for the characteristics of each product. In addition, we also offer custom design support fromsmall lots. To respond to your request, we can change the size and thickness, control the shrinkage ratio,
design each property value, and introduce the optimal metal paste, so please feel free to inquire.

Normal Type / Low Dielectric Constant Type / Low Loss TypeProduct Name

Substrate

Green
sheet

単位

GCS50*

GCS60*

GCS71*

Type

Low-k

Low-lossStandard

Dielectric constant

5.0

6.0

7.1

Dielectric loss (tanδ) at 1MHz%

< 0.3

< 0.1

< 0.3

Sintered density

g/cm3

2.34

2.79

2.85

Flexural Strength

MPa120240250

Thermal Expansion
Coefficient

ppm/℃

3.9

4.8

5.3

Thermal conductivity

W/m･K

1.1

2.1

2.6Reflectanceat t0.4mm, λ=450nm%--85

Firing Shrinkage (X-Y)%

12.8±0.513.1±0.5

13.0±0.3

Firing Shrinkage (Z)%( 32 )( 30 )( 28 )

SizemmThicknessμm□100～500 □100～500 □100～500
30～20030～30030～300High Strength Type / High Reflectivity Type / Alumina Substrate

Product Name

Substrate

Green
sheet

単位

GCS74*

GCS79*ACS*

TypeHigh Strength

High-Ref.

Alumina

Dielectric constant

7.4

7.9-

Dielectric loss (tanδ) at 1MHz%

< 0.3

<0.3-

Sintered density

g/cm3

3.02

3.10> 3.80

Flexural Strength

MPa300210> 380

Thermal Expansion
Coefficientppm/℃

5.7

4.9

6.3

Thermal conductivity

W/m･K

3.3

1.7

36.4

Reflectanceat t0.4mm, λ=450nm

%

8792-

Firing Shrinkage (X-Y)%

13.3±0.3

12.8±0.3

13.0-14.0

Firing Shrinkage (Z)%( 29 )( 30 )

19-23

SizemmThicknessμm□100～500 □100～500 □100～500
30～20030～20050～200This products information is subject to changed or updated without notice.

Oct. / 2021 Ver.1