High 170/180 TG FR4 PCB With Double Sided Lead-free HASL

High 170/180 TG FR4 PCB With Double Sided Lead-free HASL

High Tg PCB General Info

Tg means Glass Transition Temperature. As flammability of board is V-0 (UL 94-V0), so if the temperature exceeds designated Tg value, the board will changed from glassy state to rubbery state and then the function of board will be affected.

Also there're a lot of different hi-tg material not listed here, different country, different company prefer using different material. Please view datasheet for each of them to choose most suitable material for you. If without special notice, normally we will use S1170 from SYL.

170Tg is also popular in LED industry, because heat dissipation of LED is higher than normal electronic components, and same structure of FR4 board is much cheaper than that of MCPCB. If working temperature is higher than 170/180C, such as 200C, 280C, or even higher, then you'd better use Ceramic boardwhich can go through -55~880C.

Please contact us for more information about Hi Tg circuit board.

High Tg materials have the following properties:

• High glass flow temperature value (Tg)

• High temperature durability

• Long delamination durability

• Low Z axis expansion (CTE)

What is high Tg PCB (printed circuit board)

   In recent years, there are more and more customers request to manufacture PCB with high Tg, in the following we would like to describe what is high Tg PCB.

TG means Glass Transition Temperature Temperatures that are associated with long term operations must be considered in the manufactured of printed circuit boards that will be exposed to high thermal loads.. The function of a circuit board will be affected if its temperature exceeds the designated Tg value. You can count on Super PCB for a high TG PCB that won’t fail you.

Normally high Tg refers to high heat resistance in PCB raw material, the standard Tg for copper clad laminate is between 130 – 140℃, High Tg is generally greater than 170℃, and middle Tg is generally greater than 150℃. Basically the printed circuit board with Tg≥170℃, we call high Tg PCB. As the rapid development of electric industry, especially for the computer as the representative of electronic products, developing toward the high performance, high multilayer requires PCB substrate material with higher heat resistance to ensure high reliability. On the other hand, as a result of development of SMT, CMT with high density pcb assembly technology, the PCB manufacturing with small hole size, fine lines and thin thickness are more and more inseparable from the support of high heat resistance.

If the Tg of PCB substrate is increased, the heat resistance, moisture resistance, chemical resistance and stability of printed circuit boards will be improved as well. The high Tg applicates more in the lead free pcb manufacturing process.

Therefore, the difference between general FR4 and high Tg FR4 is, in the hot state, especially in the heat absorption with moisture, the high Tg PCB substrate will perform better than general FR4 in the aspects of mechanical strength, dimensional stability, adhesiveness, water absorption and thermal decomposition.

High Tg refers to the high heat resistance.With the rapid development of electronic industry, especially the electronic products represented by computer, toward high function, high multiple stratification, need PCB substrate material of higher heat resistance is an important guarantee.Represented by SMT, CMT's emergence and development of high density installation technology, make the PCB in the small aperture, fine lines, thin, more and more inseparable from the support substrate, high heat resistance.

Commonly so FR - 4 and the difference between high Tg FR - 4: is under the hot, especially in the heat after moisture absorption, its material mechanical strength, dimensional stability, adhesion, water absorption, thermal decomposition, thermal expansion situations vary, such as high Tg products is significantly better than the ordinary PCB substrate materials.

Most printed circuit boards are manufactured using glass-reinforced epoxy laminate as the substrate. While there are a wide variety of laminates available on the market, FR-4 is both versatile and well-accepted as a standard material for PCB manufacture. FR-4 functions well as an electrical insulator, and has a good strength-to-weight ratio, and is flame resistant.

The standard FR-4 material that is used in our PCBExpress® Quickturn, ValueProto® and the default material for our PCBpro® Full Feature products is a high temperature, high Td, low CTE 150Tg material. 

  If a higher Tg material is required, we do stock a 170Tg version of our standard FR-4 material as well, that can be substituted in our PCBpro Full Feature and Custom Quote products (provide a readme file or a print note specifying the 170 Tg material). There may be a material lead time for some specific sizes or thickness, and may impact due date. 

  Note: The 170Tg FR-4 material has equivalency for electrical and mechanical properties with the popular Isola 370HR material, and functions very similarly. There is one documented physical difference, Isola's 370HR is listed as a 180Tg material.   

150 Tg FR-4 material is used on all standard PCB Express Quickturn, ValueProto and all PCBpro Full Feature orders unless another specific material or Tg is called out (PCBpro Full Feature or Custom Quote).

Typical physical and electrical properties of FR-4 are as follows. LW (length wise, warp yarn direction) and CW (cross wise, fill yarn direction) refer to the fiber orientations in the plane of the board (in-plane) that are perpendicular to one another. The through-plane direction is also referred to as the z-axis.