High Tg PCB

  • A High Tg PCB is a PCB assembling with a glass transition temperature higher than 170℃. 
  • The standard Tg values for regular PCBs are between 120℃ and 170℃.
  • High Tg PCBs do better at higher temperatures with more stability.

What Is a High
Tg PCB?

Tg is the glass transition temperature of a high PCB. A PCB base material temperature changes from an inelastic condition to a more elastic and soft state. Hence, a High Tg PCB is a PCB assembling with a glass transition temperature higher than 170℃. The standard Tg values for regular PCBs are between 120℃ and 170℃.

High Tg PCBs do better at higher temperatures with more stability. And its substrate provides better mechanical & chemical stability and stronger heat resistance to its board.

The regular PCB materials for high temperature are Shengyi S1000-2, ISOLA 370HR, ITEQ-IT-180A, etc.

What Are the Features of
High TG PCB?

Nowadays, most electronics manufacturers use high Tg PCBs for computers, precise apparatuses, communication devices, etc. And it’s because of the unique features of high Tg materials, which are as follows:

Excellent PTH dependability

Great mechanical properties

Impervious to High Temperature

High-value resistance for thermal stress

It has durability for long delamination

It has a low thermal expansion

When Do You Require A High-Temperature
Circuit Board?

You may need a high-temperature circuit board for your devices if your PCB experiences a thermal load lower than 25oC below the Tg.

If your product operates in the range of 130 degrees Celsius or even higher, you may need to use a high Tg PCB to be on the safer side.

Majorly, most people use high-temperature circuit boards because of the transfer to RoHS PCBs. And this causes most PCB producers to settle for high TG materials because of the higher temperatures required for lead-free solder to move.

What Are the Necessary Materials for
High TG PCB?

Here’s a table showing the essential materials used in producing High Tg PCBs:
MaterialCTE-z (ppm/℃)Td (Wt, ℃)Tg (DSC, ℃)Td288 (min)Td260 (min)
IT180453451802060
S1141 (FR4)55300175/8
Rogers 4350B50390280//
S1000-2M (FR4)453451802060

What Are Ways to Employ Heat Dissipation
in High Tg PCBs?

If you’re looking to guard your PCBs against the high temperatures of your appliances’ process, then high Tg PCBs are necessary.
Hence, there are three important ways to dissipate heat produced by electronics with High Tg PCBs.

They are as follows:

Conduction

  • The heat produced by conduction cools down. And it does this by placing the heat sink directly with its heat source. That way, it enables heat to flow out from the source—similar to how electrical current flows in a system.

Radiation

  • Radiation heat dissipates by creating a direct path for the electromagnetic waves to leave the source.

Convection

  • Convection Heat dissipates by moving heat to water or air. Consequently, it enables the water or air to flow out from a particular area. A great example is a process of using a pump or fan to push air over the surface—and at the same time drawing heat away with the device.

The Advantages of Using High TG PCB

It allows for thin substrates, small apertures, and fine traces.

It has improved dimensional stability, mechanical strength, and a solid layer to layer adhesion for various temperature changes.

Resistance to high temperatures and preserves superb performance.

Increased stability, humidity, enhanced thermal, and chemical resistance

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High-Temperature PCB Applications

Here are a few examples of high-temperature PCB application:

WiFi Booster
Inverter
RFID
Gateway
Antenna
Embedded Systems Development
Ac Power Supplies
Embedded Computer Systems
Contract Manufacturing Services
Low-Cost Plc

What Are the Capabilities of
High-Temperature PCBs?

  • High Tg Features
    Capabilities
  • Build Time:
    2 days - 5 weeks
  • Number of Layers:
    2 – 40 layers
  • Order Quantity:
    1pc - 10000+pcs
  • Quality Grade:
    Standard IPC 2
  • Copper Weight (Finished):
    0.5oz - 2.0oz
  • Board Size:
    Min 6mm x 6mm | Max 500mm x 900mm
  • Material:
    S1141 (FR4), S1000-2M (FR4), IT180, Rogers 4350B
  • Board Thickness:
    0.4mm - 6.5mm
  • Solder Mask Sides:
    As per the file
  • Min Tracing/Spacing:
    3mil/3mil
  • Solder Mask Color:
    Green, White, Blue, Black, Red, Yellow
  • Silkscreen Color:
    White, Black, Yellow
  • Other Techniques:
    Gold fingers Countersink Holes Blind/Buried Vias
  • Min Drilling Hole Diameter:
    6mil
  • Min Annular Ring:
    4mil
  • Surface Finish:
    Lead-Free HASL – RoHS
    Immersion Silver - RoHS
    HASL - Hot Air Solder Leveling Immersion Tin - RoHS
    OSP - Organic Solderability Preservatives - RoHS
    ENIG - Electroless Nickel/Immersion Gold – RoHS

High TG PCB Technical Options

Based on normal circumstances, the listed high Tg materials can get replaced by technically similar devices. However, if you have specific requirements, you can communicate with a technical team.

CTE-z

  • This technical option shows a base material’s thermal expansion level. Hence, it represents the z-axis. And a low CTE-z value works better with higher Tg values—which signifies absolute expansion.

T260 - T288 value, Td

  • The T260 and T288 values represent the period of delamination of a tested material at 260oC and 280oC, respectively.

Why Choose High-Tg PCBs from WELLPCB?

If it’s difficult for you to determine your needs regarding the high Tg PCB, we can help you—at WellPCB. And if you’ll be needing high Tg PCBs, we would help you to choose the particular high Tg PCBs necessary for your firm.

Also, if you’re moving to RoHS or need to get more information on HighTg laminates, we’d be happy to help you.
Feel free to get in touch with us today and get a free online quote.

Our Certifications

Here are the certificates we have:
IATF 16949:2016 ISO 9001:2015 ISO14001:2015 ISO13485:2016 UL Also, all our products follow the IPC & ROHS Standards. More importantly, we always strive to manufacture high-end PCB products.

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