TU-768: Everything You Need To Know in 2022

Introduction

In general knowledge, PCB Laminates are one of the vital aspects in producing a quality board; hence, it is crucial that one must carefully consider the laminate for their devices.

TU-768 falls under a PCB Laminate produced explicitly by the Taiwan Union Technology Corporation (TUC); however, others can incorporate it.

If the application requires High TG and exceptional thermal reliability, then the TU-768 is the appropriate choice. In order to fully understand the capabilities of this laminate, we will be discussing its definition, features, industry approvals, advantages, applications, standard properties (mechanical, thermal, and electrical), importance, and common failure reasons.

Therefore, we suggest finishing the article by the end to have a guideline on whether the TU-768 is suitable for the desired application.

Introduction to TU-768

What is a TU-768?

As we all know by now, TU-768 is a laminate that is recognized to have its components halogen-free, composed of an epoxy resin and an alkali-free glass fabric.

Due to the epoxy resin system, the laminate has excellent protection against UV light that is highly compatible with Automated Optical Inspection (AOI) inspection procedure. In terms of applications, they can be beneficial if they involve excessive thermal cycles that undergo heavy operations because of the properties that make them up.

Furthermore, they are known to have exceptional Coefficient Thermal Expansion (CTE) value, excellent stability against thermal conditions, outstanding resistance to chemicals, and it has a characteristic that can resist the occurrences of CAF. As for its availability, it comes with different thicknesses, copper foil cladding, prepregs, and glass styles.

Since this laminate is free from halogen and other substances that are harmful to the environment, they are renowned for being RoHS compliant and lead-free process compatible. Hence, if that’s one of the capabilities one is looking for, then TU-768 is the right choice.

What is a TU-768?

Features and Industry Approvals of TU-768

In order to fully grasp the capabilities of the TU-768 laminates and to assess whether they are the suitable selection for one’s application, we’ll be digging deeper into the features it can offer to one’s operation and the certifications that it holds. In that way, one can easily distinguish if this laminate can be beneficial to the device or if it can potentially damage the overall performance of the device.

Features

• It is suitable for a lead-free process.
• It offers exceptional value for its Coefficient of Thermal Expansion (CTE).
• It has a property that provides anti-CAF.
• It is resistant to both thermal and chemical.
• Due to its fluorescence, it can be deployed into an Automated Optical Inspection (AOI).
• It is resistant to the presence of moisture.

Industry Approvals

• The variant Identification for IPC-4101E: /98, /99, /101, /126.
• Its evaluation solutions for IPC-4101E/126 with QPL Accreditation.
• Its FR-4.0 is the ANSI Standard with the UL Identifier.
• In terms of UL data reference, it is known to be E189572.
• It holds 94V-0 as its flammability classification.
• It only caters to 130°C as the maximum allowable heat capacity.

Advantages and Applications of TU-768

Before we proceed into the different applications of TU-768, we will focus first on its advantages to see if they align with one’s desired specifications and operation.

Advantages

One of the significant pros of using this laminate is that it is halogen-free and environmentally friendly. Apart from that, it possesses exceptional electrical properties and, in its z-axis, it has excellent thermal expansion. Additionally, it is compatible with lead-free and FR-4 processes. As for its dielectric and dissipation factors, it is regarded to be outstanding, with values of less than or equal to four (4) and less than or equal to 0.005, respectively. Ultimately, it has anti-CAF, excellent resistance to moisture, and reliable performance under frequency.

Application

• Back Panels
• Storage and Line Cards
• Base Stations, including Servers and Telecom
• Office Routers
• Consumer Electronics
• Automotive Industry

Typical Properties of TU-768

Besides the features and advantages of utilizing a TU-768 laminate, it is crucial to consider its electrical, mechanical, and thermal properties to assess if they are compatible with any applications one may have in their mind. Hence, we’ve gathered information from the Taiwan Union Corporation Technology to have definitive information about these properties.

Thermal Properties

Property	Typical Values	Test Condition	SPEC
TG (DMA)	190°C	E-2/105+des	N/A
TG (DSC)	180°C
TG (TMA)	170°C
TD (TGA)	350°C
CTE (x-axis)	11~15 ppm/°C	Ambient to TG	N/A
CTE (y-axis)	11~15 ppm/°C	Ambient to TG	N/A
CTE (z-axis)	2.7%	50°C to 260°C	< 3.0%
Thermal Stress, Solder Float, 288°C	> 60 sec	A	> 10 sec
T-260	> 60 min	E-2/105+des	> 30 min
T-288	> 15 min		> 15 min
Flammability	94V-0	E-24/125+des	94V-0

Electrical Properties

Property	Typical Values	Test Condition	SPEC
Permittivity (RC50%)		C-24/23/50	N/A
1 GHz (SPC Method/HP 4291B)	4.4/4.3
5 GHz (SPC Method)	4.3
10 GHz (SPC Method)	4.3
Loss Tangent (RC50%)		C-24/23/50	N/A
1 GHz (SPC Method/HP 4291B)	0.019/0.018
5 GHz (SPC Method)	0.021
10 GHz (SPC Method)	0.023
Volume Resistivity	> 1010 MΩ-cm	C-96/35/90	> 106 MΩ-cm
Surface Resistivity	> 108 MΩ	C-96/35/90	> 104 MΩ
Electric Strength	> 40 kV/mm	–	> 30 kV/mm
Dielectric Breakdown Voltage	> 50 kV	–	> 40 kV

Mechanical Properties

Property	Typical Values	Test Condition	SPEC
Young’s Modulus		A	N/A
Warp Direction	25 GPa
Fill Direction	22 GPa
Flexural Strength		A
Lengthwise	> 60,000 psi		> 60,000 psi
Crosswise	> 50,000 psi		> 50,000 psi
Peel Strength, 1.0 oz of Copper Foil	7~9 lb/in	A	> 4 lb/in
Water Absorption	0.18%	E-1/105+des+D-24/23	< 0.8%

Common Failure Causes of TU-768 Laminate

If planning to determine the issues of a TU-768, we suggest performing troubleshooting. In that way, one can detect the probable causes of TU-768 misbehavior. This section will discuss some of the common reasons it fails.

Firstly, it could be because of delamination, wherein is caused by excessive heat received by the interlaminar board that significantly affects the bond strength of the multilayered board since it can significantly increase the stress it possesses. However, this only occurs if the bond isn’t done flawlessly, which makes it resistant to heat. Thus, reaching out to a manufacturer with decades of experience is necessary to ensure that the laminate is done perfectly. Apart from that reason, there are countless causes of delamination because of mechanical and chemical factors, but the common one is the one mentioned above.

Some of the factors that affect the laminate mechanically are the class of prepreg and the stack-up. While chemical factors, it includes oxidation and degradation. Other than delamination, the other probable cause of TU-768 failure would be moisture retention which can result in wearing all the optimized processes conducted beforehand.

Nevertheless, failures can be avoided with the right producer with extensive industry knowledge, such as PCBTok; we always guarantee the quality of our products to our clients.

Some Common Failures of Circuit Boards

Importance of TU-768 Laminate in PCB

We have the following reasons as to why one should consider incorporating a TU-678 laminate and prepreg into their circuit boards.

• First off, they adhere to IPC-4101 specifications.
• Each laminate should withstand rigorous quality assurance and hold the required approvals.
• All TU-678 Laminates are highly eco-friendly since the creator ensures that it is FR-4 compliant, halogen-free, red-phosphorous-free, and antimony-free.
• It offers mass-lamination services, is long-lasting, and is widely utilized in countless OEM applications; this demonstrates the exceptional quality and performance of a TU-678.
• It offers substantial price savings, and manufacturing versatility is guaranteed; hence, it is ideal for almost every PCB Fabrication procedure.

Why Use a TU-768 Laminate?

Conclusion

To wrap everything up, TU-768 laminates and prepregs are recognized to be highly appropriate for high TG applications and operations requiring reliability under heat. Also, this laminate was first introduced by the Taiwan Union Technology Corporation (TUC).

If you’re still unsure where to acquire your TU-678, then look no further, as PCBTok has the adequate knowledge, experience, staff, and sophisticated technologies to produce an enhanced quality performing laminated board. We are accessible 24/7!

Kindly message us for any inquiries you may have; we’ll provide everything you need at one stop without any hassle! If you’re going to contact us today, we guarantee remarkable offers for your needs!