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Flexible PCB supplier china:Types of PCB Substrates

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Popularity:151Dated :06-24-2022 02:55【big well Small

Flexible PCB supplier china tells you types of PCB Substrates:


  FR-4 printed circuit boards make up the vast majority of printed circuit boards available on the market. This is by design: made out of a woven glass reinforced by epoxy resin, FR-4 boards are low cost, perform well, are lightweight, and have good moisture resistance.

  To clarify: FR-4 is not a material, but a classification that indicates its flame resistance

  While FR-4 is great for consumer electronics, it has a high dielectric loss, making it unsuitable for high-speed or high-frequency applications. When price is the most important factors, printed circuit board designers turn to FR-4 to deliver great results at minimal cost.

Flex PCB Substrates

  Wearable technology is one of the biggest developments in consumer electronics. Combining the functionality and utility of smart devices with the convenience of fitting around a wrist, it shows just how we have come over a decade, and how far we have yet to go. These devices would be impossible without flexible printed circuit boards.

  Flexible printed circuit boards have a variety of applications that go beyond what we wear. Thanks to the fact that these printed circuit boards can bend, flex PCBs can fit a ton of surface area into limited or unusually shaped spaces. This makes them used from everything from calculators and video game systems to medical devices and satellites. They can even function in areas with environmental hazards.

  The biggest feature of flex PCB substrates is their ability to bend. Thus, their material composition is soft, and are formed with an epoxy that is generally shaped around a glass weave. Some common substrates include:

  Polytetrafluoroethylene – Commonly known by its brand name, Teflon, PTFE is the go-to option for flex PCB materials. With good temperature stability and low dissipation, they are found in cruise control, power amplifiers, antennas, and aerospace telemetry.

  Polyimide – Polyimide has a good temperature range, high chemical resistance, and solid conductive properties. This material makes a good option for small consumer goods like gaming devices, cameras, and calculators.

  Polyether Ether Ketone – For the most extreme conditions, PEEK can’t be beat. It can handle high amounts of radiation, great chemical resistance, and a high melting point. The properties of this printed circuit board substate make it used in medical technology like X-rays and gamma ray machines, as well as on aircraft.

Rigid PCB Substrates

  Unlike flexible printed circuit boards, rigid circuit boards are immobile. This makes them less shockproof, waterproof, and resistant to corrosion. Yet despite these setbacks, rigid PCBS are durable, cost-effective, and powerful.

Rigid printed circuit boards are generally ceramic-based substrates. These boards have high thermal conductivity and high operating temperature. They are compact, meaning that they can take up less space than some of their counterparts, and are the easiest types of boards to repair.

  Three of the most popular ceramic-based printed circuit board materials are:

  Aluminum – With strong thermal dielectric and low expansion, aluminum is the most popular type of ceramic printed circuit board. Able to operate up to 350˚C before reaching its melting point, it boasts excellent high-frequency performance in even the harshest high-temperature applications. However, the thermal conductivity of these printed circuit boards does not meet the demands of high-power devices like integrated circuits. It is generally used in cooling and heating, LEDs, medical circuits, and sensors.

  Aluminum Nitride – High-power devices like LEDS, integrated circuits, and sensors rely of aluminum nitride substrates in their printed circuit boards. Aluminum nitride substrates have thermal conductivity that is nearly ten times higher than aluminum printed circuit boards.

  Beryllium Oxide – This substrate material boasts an even higher thermal conductivity than aluminum nitride, making its potential applications even more advanced. One problem, however, is that it is extremely toxic during the machining process. It is used in industrial microwave ovens and high voltage integrated circuits.

  Additional materials, such as silicon carbide, are also available for the most advanced applications such as laser fields, with strength at up to 1400°C. Yet with a material composition identical to diamond, it remains well out of the price range of most consumers.

Flex-Rigid PCB Substrates

  Why not have the best of both worlds? Flex-rigid printed circuit boards combine both types of materials and are generally used in aerospace, medical, and military applications.

  They rely primarily on polytetrafluoroethylene components such as RO3000 and RO4000 thanks to both being simple to create and having low dielectric loss at microwave frequencies.

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