ECRI Microelectronics

Thick Film

ECRIM Thick film product ( Thick film substrate/Thick film resistor) capability
1. Overview

Passive network is fabricated on the same substrate by thick film process such as screen printing and sintering. The circuit design has great flexibility and short development cycle. It is suitable for mass production and has an annual output value of more than 100 million. In terms of electrical performance, it can withstand higher voltages, greater power and larger currents.

2. Product Features
Front and back metallization, can punch metallization, can realize chip bonding, device bonding and welding functions.

3. Technical Index
Substrate materials: AlN, AI2O3, BEO,
Line width/line spacing: 75um
Metallized materials: Au, Pd/Ag, Ag, Cu

4. Typical Product
Thick film substrate for hybrid circuit, thick film substrate for power device, power resistor, attenuator

5. Application Domain
Aerospace, computer, automobile, communication, consumer and other electronic products.

Due to the positive properties of the ceramic base material, thick film circuits are used as a priority in areas which are characterised by harsh environmental conditions (high/low temperatures, temperature changes, moisture, vibrations, accelerations etc.). This technology meets the requirements of the highest integration, reliability, lifetime and environmental compatibility.
Areas of application include industrial electronics, medical electronics as well as automotive and aerospace industry.


Thick film hybrid technology is a widely-used technology for the manufacture of a ceramic or other type of circuit boards. Due to its high degree of integration, thick film substrates form the basis of High Density Packages (HDP).

In an initial manufacturing phase, the structures are applied by means of a silk-screen process onto the relevant substrate material such as aluminium oxide (Al203) or alumina (AIN). Conductors, resistors, insulations and overglazes can be manufactured. Gold, silver and platinum or palladium alloys are generally used as conductive materials. The standard thick film process are printing, drying and firing. The firing process at about 850 °C guarantees the final film properties such as electrical values and adhesive strength.

Thick film technology enables a very simple and flexible manufacture of multilayers with several conductive layers on the front and back side of the substrate.

Minimum structure resolutions of 80 - 100 µm can be achieved with this technology.

Printed resistors can be trimmed to a output signal of a hybrid circuit. In principle all electronic components can be assembled on a thick film substrate. Therefore solderable as well as bondable surfaces are available.

Benefits


The benefits compare to traditional printed circuit boards are in the thermal and electrical properties of the thick film substrate material. Ceramics are very heat-conductive and as one of the chip base materials, are therefore optimally matched to the TCE of silicon. The above mentioned structure resolutions and the integration of printed, passive components make a circuit miniaturisation possible.


ECRIM thick film product process line capability

screen printing

screen-printing

Sintering

sintering

Layer thickness testing

layer-thickness-testing

Laser trimming


laser-trimming

Assembly Center

assembly-center

Bonding

bonding

Line-width/Space               125 um /100um

Substrates                     Al2O3,  ALN

Conductors               Au,  Ag,  PtAg,  PaAg,  PtPaAu

Bonding                      Au, Si-Al

Hermetic sealed                Metal Package

Resistors’s tolerence             ≤±1%

Resistor TCR                   ±100ppm/℃

Resistor Tracking                ±25ppm/℃

Ω/Sq Resistor Range              1-10M

Number of multilayers            6 (up)

Size of substrates                120mmx120mm (up)

Inspection standard              MIL-PRF-38534  CLASS H

Annual Total output : 1,000,000 units