• Processes like FR-4 at lower fabrication cost
  • Excellent dimensional stability
  • Low Z-axis coefficient of thermal expansion
  • Competitively priced

What is the difference between Rogers RO4350B and RO4835?

Rogers high-frequency board RogersRO4350B hydrocarbon ceramics and RO4835 hydrocarbon ceramics belong to the Rogers high-frequency board RO4000 series of materials, belonging to the civilian series.

The biggest difference between the two is that Rogers high-frequency board RO4835 is added with antioxidants, which improves the oxidation resistance by 10 times compared with traditional thermosetting materials, and meets the requirements of IPC-4103 (standard for high-speed and high-frequency substrates), its oxidation resistance Stronger than Rogers high frequency board RO4350B.


Rogers RO4350B Material Quality Standard

Rogers RO4350B is a type of Rogers imported sheet from the United States, and the material we purchase strictly adheres to the following important quality and safety standards.

1. UL standard
2. ISO standards
3. CE standard
4. REACH the standard
5. The IPC standard

Summary of some key features of the RO4350B PCB

From our guide page it can be concluded that not only does the RO4350B PCB have good high frequency performance, low RF losses and excellent electrical characteristics.

But it is also low cost to produce and can be fabricated with RF4 multilayer mixing and other features.

It is a cost-effective PCB RF material.


Best RO4350B PCB in China


Venture RO4350B PCB is a hydrocarbon/ceramic laminates that provide tight control on dielectric constant (DK). Our RO4350B PCB maintains low loss while utilizing the same processing method as standard epoxy/glass.

The Venture RO4350B PCB materials are UL 94 V-0 rated for high power RF designs and active devices.


Your Leading RO4350B PCB Supplier in China

Venture Electronics manufactures RO4350B PCB available at a fraction of the cost of conventional microwave laminates. They do not require the handling procedures as PTFE based materials or special through-hole treatments

We manufacture Venture RO4350B PCB with some advantages:

  • Dk of 3.48 +/- 0.05
  • Dissipation factor of 0.0037 at 10 GHz
  • Low Z-axis coefficient of thermal expansion at 32 ppm/°C

We have 10 years RO4350B PCB manufacturing experiences in different kinds of applications such as:

  • backhaul radios
  • communications systems
  • computing
  • IP infrastructure
  • power amplifiers
  • small cells/DAS
  • test and measurements

If you need the highest quality RO4350B PCB, Venture is the best partner in China! We have been supplying Venture RO4350B PCB for more than 10 years.

Our company is ISO certified. We strive to give you the best quality RO4350B PCB products and services.

At Venture, we don’t have a minimum order for RO4350B PCB. Large or small order for RO4350B PCB is always welcome at Venture.

Send us your inquiry for the RO4350B PCB order now!

RO 4350B PCB: The Ultimate FAQ Guide


In this guide, you will find all information you’re looking for about RO 4350B PCB such as features, surface treatment, benefits, limitations and rating, just to mention a few.

So, if you want to be an expert in RO 4350B PCB, read this guide.

What is Rogers PCB?

Rodgers PCB is a high-frequency circuit board fabricated using PCB materials constructed by Roger cooperation.

The company specializes in manufacturing a diverse range of laminates used in manufacturing printed circuit boards (PCB).

Roger PCB has high performance, low electrical noise, low signal loss, high board temperatures, and is competitively priced.

How does Rogers PCB compare to other PCB Materials?

This is what you need to know when choosing these PCB materials:

· Isola PCB

Isola manufactures dielectric prepregs and copper-clad laminates, which best suited for the construction of multi-layered PCBs.

 Isola PCB

 Isola PCB

· Taconic PCB

Tonic PCBs are fabricated using silicone coated and PTFT materials while Roger PCB laminates comprise of hydrocarbon/ceramic laminate reinforced by woven glass.

Taconic PCB

Taconic PCB

·  Arlon PCB

Arlon PCB laminates are specially produced to manufacture PCBs specialized in thermal, electrical, and mechanical applications.

These PCBs also have a very high Transitional temperature of 250°C and a pyrolysis temperature of 380°C.

Arlon PCB

 Arlon PCB

· Nelco PCB

Nelco PCBs fabricate a high layer, digital PCBs with superior mechanical and thermal properties.

Their laminate materials have similar Dk values to Rogers PCB though Rogers PCB has higher transitional temperatures.

 Nelco PCB

 Nelco PCB

What are the Features of RO 4350B PCB?

An RO 4350B PCB is a high frequency and low-cost PCB constructed using RO 4350B materials.

It possesses the following key features:

  • Has very low dielectric tolerance and loss
  • The electrical properties vs. frequencies are very stable.
  • The thermal coefficient of the dielectric constant is very low.
  • You can have it in double or multiple layers.
  • The Z-Axis expansion is low.
  • The SMT process is resistant to rework and reflow soldering.
  • Great heat dissipation
  • Excellent resistance to oxidation
  • It can meet a wide range of PCB needs, from prototype development to mass production.
  • Available over a broad RO 4350 laminates
  • The base copper available in 0.5oZ and 1oZ

What are the Features of RO 4350B PCB Laminate?

RO 4350B is a proprietary hydrocarbon ceramic laminate reinforced by woven glass manufactured by Rogers PCB material for low-cost applications that require very high frequency.

The following features characterize the RO 4350B PCB laminate.

  • Easy to process through automatic handling
  • Easy to manufacture in large volumes
  • It has a low Z-axis expansion
  • Great dimensional stability
  • Most suited for high-frequency performance
  • Resistor film is thin
  • Resistant to CAF
  • Very low dielectric tolerance and loss
  • The thermal coefficient of the dielectric constant is very low
  • In-plane coefficient expansion is low
  • Electrical vs. frequency properties are very stable

What is Rogers 4350B Dielectric Constant?

The dielectric constant is the ratio of electric permeability of the material to that of the free space.

There are processes and design dielectric constant for RO 4350B.

You should consider using design dielectric constant in case of PCB fabrication.

The Dielectric constant process of RO 4350B is 3.48 ± 0.05, while the constant dielectric design is 3.66.

What is UL 94-VO Rating for RO 4350B PCB?

UL94 test is a flammability test used to determine plastics’ flammability properties.

It measures the ability of the material to extinguish flame once ignited.

It also measures the dripping behavior exhibited by the material upon subjection to an open flame or heat.

Accordingly, a material with V-0 rating class will extinguish the flame on a vertical plane after 10 seconds and allow dripping of non-inflamed particles.

What Types of Applications use RO 4350B PCB?

You can use RO 4350B laminate to construct high-performance PCBs used in a wide range of applications.

The low dielectric loss characteristic of the RO 4350B enables you to construct PCBs suitable for use in applications that can limit conventional laminates because of the higher operating frequencies.

Some of the typical applications which significantly benefits from PCBs constructed from RO 4350B include:

  • Global communication systems
  • Complex multi-layer and highly reliable circuits
  • Wireless communication equipment
  • Couplers
  • Microwave point to point connections
  • Automotive radar and sensors
  • LNB for live satellites
  • Power amplifiers
  • 3G and 4G antenna
  • Power amplifiers
  • Power dividers
  • Trunk amplifiers
  • RF transmitter
  • Multi-coupler antenna
  • RF identification
  • spread spectrum communication systems
  • A cellular Base station and microstrip antennas
  • LNB’s for Direct Broadcast Satellites
  • Relay stations
  • Variocoupler
  • RF switches etc.

How can you handle Wire Bonding for RO 4350B PCB?

Wire bonding helps you interconnect the integrated circuit (IC) or semiconductor equipment to the package when fabricating.

You can also use wire bonding to interconnect different PCBs.

You can use conventional wire bonding techniques used for epoxy glass grade parameters for RO 4350B laminate.

You can use the typical lead bonding methods.

There are methods are divided into two categories, including:

1. True Fusion Welding

The method involves melting lead metal and circuit pads together. They include:

  • Resistance welding
  • Parallel gap welding
  • Percussive Arc welding
  • Laser welding
  • Electron beam welding
  • Soldering

2. Diffusion Bonding

The method creates joints without welding. The standard diffusion bonding techniques include:

  • Thermosonic bonding
  • Thermal compression bonding
  • Ultrasonic welding

What are the PCB Fabrication Guidelines when Constructing RO 4350B PCB?

You can follow the tips below when constructing a RO 4350 PCB.

 RO 4350 PCB

 RO 4350 PCB

  • Inner Layer Preparation

Tooling: RO 4350B is compatible with a diverse range of pinned and pinless tooling systems.

Therefore, the choice will depend on the preference and capabilities of the circuit and requirements of final registration.

Use chemical processing for thinner cores and mechanical processing for thicker cores to prepare material surface copper etching and photoresist processing.

Consult the guidelines accompanying the chosen adhesive system or prepreg when selecting a copper oxide or alternative oxide treatment for the core.

Similarly, follow the adhesive system guidelines for multi-layer bonding since RO 4350B laminate is compatible with many thermoplastic and thermosetting adhesive system.

  • Drilling

You can use standard entry or exit materials to drill RO 4350B cores/ bonded assemblies.

You should use less than 500SFM drilling speed

  • Metal Deposition

You don’t have to undertake any special treatment before the metallization of RO 4350B.

You can also consider copper flash plates before imaging for boards having holes with a high aspect ratio.

  • Copper Plating and Outer Layer Processing

You can use standard electrolytic tin, tin/lead plating, acid copper, and panel and pattern processing.

Following plating, you can process the laminate through the standard SES method.

  • Storage

Store the laminates under standard room temperatures ranging from 10 to 30C and humidity.

Avoid exposing it to excess humidity, which will readily cause oxidation to the material.

What is the Temperature Rise Estimation for RO 4350B PCB?

You can determine the temperature rise estimate of RO 4350B laminate by conducting a series of calculations under the following assumptions:

  • The ground planes receive all the heat generated by RF power or current through Z-direction generation.
  • The complete loss of RF power insertion is regarded as conductor trace generated heat
  • It has reached a steady-state
  • The ground plan maintains a uniform temperature, and a consistent rise in conductor metal temperature is evident

When subjected to similar power levels and frequencies, FR-4 shows a high rise in temperature of about +84°C while RO 4350B only exhibits a +56°C rise above average room temperature.

What is PCB Impedance?

PCB impedance is the amount of opposition subjected to the electrical circuit of the PCB when you apply an alternating current through it.

You need to define the level of impedance control for your PCB to maintain a constant impedance on the entire electronic board.

It is critical in high-frequency applications where the need to maintain a clear signal and protect transferred data from damage is paramount.

What are the Standard Specifications for RO 4350B PCB Laminate?

The following list denotes the standard specifications of the RO 4350B PCB laminate.

  • The dielectric constant of 3.5 to 4
  • Dissipation factor 0.0031 to 0.0037 at 10 GHz, but you can use it for frequencies of up to 40 GHz.
  • The coefficient of thermal expansion at 32 ppm/°C
  • The decomposition temperature at 390°C
  • The glass transition temperature is higher than 280°C
  • Material thickness varies considerably. You can get RO 4350B, whose thickness range from 0.101 mm to 1.534 mm.
  • The electrical strength of 31.2 kV/mm and 78V/mm.
  • The material flammability rating is V-0.
  • The peel strength is 88 N/mm (5.0) pli
  • The thermal coefficient of 16 ppm/°C
  • Thermal conductivity of 71 W/m/K

Which Surface Treatment Methods can you Apply on RO 4350B PCB?

Surface treatment through finishing is coating applied between the bare board PCB and the components to protect exposed copper circuitry and enhance the solderability.

Below are some of the commonly used methods:

  • Hot Air Solder Levelling (HASL)

It is a widely used surface coating technique.

It involves immersing circuit boards in molten lead and tin alloys then getting rid of excess solder by blowing hot air across the board’s surfaces (Air Knives).

  •  Electroless Nickel Immersion Gold (ENIG)

It is a two-layered metallic coating.

Nickel provides the barrier copper and offers a surface for soldering the components.

The gold layer proves low contact resistance and protects Nickel in storage.

  • Electroless Nickel Electroless Palladium Immersion Gold (ENEPIG)

The coating constitutes three layers of metallic coating of Nickel, palladium, and gold.

Unlike the other coatings, ENEPIG is bondable.

It outperforms most of the coating types after assembly resistance to corrosion and is best suited for high-frequency applications that do not have sufficient spacing.

  •  Immersion Tin

This kind of finishing applies metallic finish over the underlying copper through a chemical displacement reaction.

It protects the copper throughout its service life.

  •  Organic Coating

It is a water-based finishing technique that uses organic compounds suitably used for copper pads.

It preferably binds to copper, forming an organometallic layer that protects it before soldering.

It preserves the underlying copper through the conveyorized process involving applying a thin material layer over the exposed copper surface.

  • Immersion Silver

The finishing constitutes sub-micron coating with almost pure silver through replacement reaction.

Sometimes it can contain organic matter that prevents corrosion, silver to silver migration, and tarnishing.

How do you Test the Quality and Performance of RO 4350B PCB?

You can conduct multiple tests used by Electronic Contract Manufactures (ECMs) to verify the quality and performance of RO 4350B PCB.

Some of the necessary tests include:

  • In-circuit Test (ICT)

It checks on the short and open circuits, operation of ICs, and the component values.

It measures the resistance by pressing small spring-loaded pogo pins into different test regions.

This test assesses the quality of solder connections on the board.

The board contains predesigned points of access, which enables the circuit to connect with in-circuit test probes.

  • Automated Optical Inspection (AOI) Test

This automatic test offers enhanced test speed and repeatability in comparison to other manual test techniques.

It takes picture snaps of the PCB using 2D or 3D cameras then compares them to the PCB’s detailed schematic.

You have to achieve a predetermined degree of resemblance for the test to pass.

You should always use the AOI test alongside other tests.

  •  Flying Probe Test

This non—powered test uses needles obtained from the probe of basic CAD and attached to the x-y grid.

Once the program matches your circuit board, it will check on defects on the following:

  • Shorts
  • Opens
  • Resistance
  • Capacitance
  • Diode issues
  • inductance

The significant difference between this test method and the ICT test is the cost of operation, which is higher for ICT.

Otherwise, ICT is faster, more accurate, and cheaper when handling large volumes of boards.

  • X-Ray Inspection (AXI)

This test is more of an inspection and uses the X-ray technology to check for defects that cannot be detected visually.

The test comes in 2Ds and 3Ds and will look at the barrels, solder connections, and internal traces.

The test is time consuming, costly, and requires the expertise of a trained operator.

  • Functional Test

Though time-consuming, this test if fundamental to ensure that the PCB powers up, consequently saving you money and time if other defected.

The test will engage the series of other external devices and fixtures and ensure the PCB meets all the necessary regional and industry standards.

  • Burn-in Test

The test is highly intensive and can potentially damage other parts of the PCB.

You will use a burn-in test to establish the load capacity of the PCB and detect potential early failure.

Accordingly, the burn-in test works by passing power through the circuit non-stop at the maximum specified capacity for between 85 and 168 hours.

This test can significantly lower your board’s service life, especially if you exceed your board’s stress ratings.

  • Other Tests

You can also conduct other types of functional tests to check how best it fits your environmental conditions.

They include:

  • Solderability test
  • Contamination test
  • Solder float test
  • Micro-section analysis test
  • Time-domain reflectometer
  • Peel test
  • Solder float test etc.

How does Double RO 4350B PCB compare to Multilayer RO 4350B PCB?

The following are some of the differences between the two types of PCB.

  • Stack Up

A double-layered PCB has 2 circuit layers. The top layer, commonly known as the signal layer.

A multi-layer PCB has several layers sandwiched on the stack up.

The layers constitute a top signal layer made of copper followed by a propreg and a plane.

Soldered interconnects are placed on the top and bottom layers.

  • Design

Multi-layered PCB provides more surface area for conductor patterns and housing compared to double-layered PCB.

Majority of the double-layered PCB range between 4 to 8 layers, but you can have multi-layered circuits extending beyond 12 layers.

Even-numbered multi-layered PCBs are less prone to complications compared to odd layered PCBs, thus highly preferred.

  • Functionality

Functionality dramatically depends on the design and other inclusions.

A 2 layered PCB with microstrip traces on a ground plane has fewer propagation delays and delivers excellent functionality.

On the other hand, a multi-layered PCB comprising VCC plane layer, ground, and signal layers gives a better result

  • Cost

Multi-layered PCB is more expensive than double layered PCB because it is too complex to fabricate and has a higher sensitivity.

Furthermore, it provides superior signal quality by reducing propagation and distortion levels.

What are the Benefits of RO 4350B PCB?

Using RO 4350B laminates to construct your PCBs will provide you with numerous advantages that you will not achieve with other laminate types.

Key among these benefits include:

  • Low dissipation factor (Df)
  • Low and stable dielectric constant (DK) over a wide range of frequency supports excellent and fast signal transmission.
  • It has a low dielectric loss, which also translates to lower signal strength loss and boosts the signal transmission of the whole device.
  • Has a lower thermal expansion coefficient along the Z-axis
  • The internal expansion coefficient is very low.
  • Has lower dielectric constant tolerance
  • The electrical properties are very stable at different frequencies.
  • Easy to mass-produce
  • Resistance to oxidation is heat dissipation is excellent.
  • You can easily construct a multi-layers and mix with FR4 simultaneously.
  • The product price is very competitive and user friendly.
  • It can operate over a wide range of temperatures with excellent resistance to low and high temperatures, from -192 ℃ to 260℃.

What are the Limitations of RO 4350B PCB?

The laminate may suffer the following problems under the specified condition:

  • Change in dielectric properties when exposed to an oxidative environment for too long. The changes are exuberated by increasing temperatures.
  • Similarly, storage of RO 4350B under high humidity will readily cause oxidation of metal claddings.
  • Long term storage for a period exceeding five years can also cause detectable oxidation levels on the panel edges.
  • RO 4350B is costlier compared to FR-4.

What are the Features of Rogers Substrate PCB?

A PCB substrate is a foundation on which you build on.

It hosts all the components and traces, giving the PCB its shape and structure.

Rodger PCB substrate has the following features:

 Rogers 4350 PCB

Rogers 4350 PCB

  • Lower loss of electric signal
  • Low dielectric constant loss
  • The dielectric constant is very wide, that is, 2.55 to 10.2
  • The cost of fabrication is low.
  • PCB sot fabrication is very effective
  • Increased thermal management
  • Low space application outgassing

How does RO4350B vs. FR4 PCB Material Compare?

There are a lot of differences, as well as some similarities between these two types of materials.

RO435B is a hydrocarbon/ceramic laminate reinforced by a woven glass.

FR-4 grade is a flame retardant material constructed using woven fiberglass cloth bound together by an epoxy resin binder.

The following are some differences between the two materials;

  • RO 4350B more expensive than FR-4
  • RO 4350B gives better performance in applications with a higher frequency.
  • PCB material constructed from FR-4 material will suffer more signal loss because FR-4 has a higher dissipation factor compared to RO 4350B.
  • RO 4350B has a wide range of Dk values than FR-4 material compared to impedance stability.
  • RO 4350B is better suited in managing temperatures because it has lower variations compared to FR-4.
  • RO 4350B has a transition temperature (Tg) of more than 280°C, while most FR-4 materials vary from 135°C to 180°C.

Is RO4350B PCB suitable for High-Frequency Applications?

Yes, RO 4350B laminate is most suitable for high-frequency applications because it has a very low dielectric tolerance and loss.

What are the Features of RO4000 Series Laminates?

RO4000 series laminates are a series of top-quality laminates.

Some of the features of the RO4000 series include:

  • Very low dielectric tolerance and loss

The quality allows you to design very reliable circuits suitable for broadband circuits requiring high-frequency circuits with excellent electrical performance.

  • Construction material comprises reinforced hydrocarbons/ceramics laminates.

The construction material design is excellent for the fabrication of circuits suitable for high volume and performance-sensitive applications.

  • Have a stable electrical property in comparison to frequencies

which enable you to construct a circuit with controlled impedance transmission lines and filters with repeatable designs

  • Low-in-plane expansion co-efficient

It allows the circuit to maintain its stability over a wide range of circuit processing temperatures.

  • Volume manufacturing process

High output manufacturing rate while maintaining competitive prices.

  • A lower thermal coefficient of the dielectric constant gives the circuit good dimensional stability.
  • Low expansion of the Z-axis enables the creation of reliable pleat-through holes.
  • Have good resistance to conductive anodic filament

What is the Coefficient of Thermal Expansion of RO4000 Series Laminates?

The coefficient of thermal expansion (CTE) of RO4000 series laminate indicates how much these materials will expand or contract to increase or decrease temperature.

The CTE slightly varies from one laminate to the other.

For example, the CTE of RO 4003C across X, Y, and Z-axis is 11, 14, and 46, while that of RO 4350B is 10, 12, and 32, respectively, through the temperature range from -55°C to 288°C.

Generally, the CTE of RO 4000 series laminate closely resembles that of copper (18 ppm/ ° C) and provides numerous advantages in designing a circuit.

The Z-axis of RO 4000 has a low CTE and reliably supports high-quality plating through holes even under application with severe thermal shock.

Venture Electronics we manufacture high-performance RO 4350B PCB.

For any questions or inquiries, contact Venture Electronics now.

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