4-Layer Rogers RO3003+TG170 FR-4 Hybrid PCB Immersion Silver Green Solder Mask

4-Layer Rogers RO3003+TG170FR-4 Hybrid PCB Immersion Silver Green Solder Mask

Overview

This 4-layer hybrid printed circuit board (PCB) integrates Rogers RO3003 high-frequency ceramic-filled PTFE laminate and high-temperature TG170 FR-4 material, engineered to deliver superior radio frequency (RF) performance, mechanical stability, and cost-efficiency for commercial microwave, automotive radar, satellite communication, and wireless broadband applications.

With a precision-engineered layer stacking, this hybrid circuit board PCB resolves the core pain points of pure high-frequency material cost constraints and pure FR-4 insufficient RF performance in high-frequency signal transmission. It adopts immersion silver surface finishing, green solder mask on the top layer, and no solder mask on the bottom layer to balance signal integrity, heat dissipation, and assembly adaptability. All boards undergo 100% electrical testing before shipment to guarantee long-term reliability in extreme thermal and operational environments.

PCB Construction Details

This section summarizes the core structural parameters of the 4-layer hybrid PCB, covering base materials, dimensions, layer thickness, copper weight, surface treatment, and solder mask configuration, all strictly controlled to meet high-frequency application requirements.

PCB Stackup Design

The stackup adopts a symmetric-like hybrid structure, placing RO3003 high-frequency core in the signal-critical layer to ensure low loss and stable dielectric performance, withTG170 FR-4 as structural support layers to control cost and enhance mechanical strength.

Material Synergy & Performance Advantages

• The hybrid design of Rogers 3003 and TG170 FR-4 is the core competitive advantage of this PCB. Rogers RO3003 is a ceramic-filled PTFE composite laminate tailored for high-frequency applications, featuring an ultra-stable dielectric constant (Dk) of 3.00±0.04 at 10GHz, an extremely low dissipation factor (Df) of 0.0010, and stable electrical performance across -50℃to 150℃and up to 77GHz operating frequency. TG170 FR-4 is a high-temperature resistant epoxy glass laminate with a glass transition temperature (Tg) of 170℃, excellent mechanical strength, process compatibility, and cost advantages, suitable for structural support and low-frequency signal/power transmission layers.

• The X/Y-axis coefficient of thermal expansion (CTE) of RO3003 is 17ppm/℃, perfectly matched with copper foil, ensuring minimal dimensional shrinkage (less than 0.5 mils per inch after etching and baking) and avoiding warpage, deformation, or circuit offset caused by thermal cycling. The Z-axis CTE is 24ppm/℃, significantly improving the reliability of plated through-holes (PTH) in harsh thermal environments. TG170 FR-4 complements RO3003 with high rigidity and low water absorption, ensuring the overall board maintains flatness and structural integrity during SMT assembly and long-term operation.

• This hybrid scheme retains the ultra-low loss, high stability, and wide frequency bandwidth of high-frequency materials for critical RF circuits, while using cost-effective FR-4 for non-critical layers, reducing material costs by approximately 30%-40% compared with fullRO3003 PCBs, making it ideal for mass-produced commercial high-frequency products.

Structural & Process Features

• Precision Dimension Control

The hybrid board size is strictly controlled at 52mm×77mm with a tolerance of±0.15mm, adapting to miniaturized communication and radar modules. The finished thickness of 0.8mm meets the thin-board requirements of portable and vehicle-mounted devices, ensuring compatibility with standard assembly processes.

• Copper Weight Optimization

Outer layers use 1oz copper foil to enhance current carrying capacity and heat dissipation performance, while inner layers use 0.5oz copper foil to reduce signal loss and crosstalk, balancing power supply and high-frequency signal integrity.

• Surface Finish & Solder Mask Design

Immersion silver surface finishing provides flat, lead-free compatible pads, ensuring reliable soldering and long-term conductivity, suitable for high-frequency connector and chip assembly. The top layer uses green solder mask without text to protect circuits and prevent short circuits, while the bottom layer has no solder mask to maximize heat dissipation efficiency, critical for high-power RF amplifiers and radar modules.

Typical Applications

This 4-layer RO3003 + FR4 hybrid PCB is widely used in commercial high-frequency and RF fields:

• Automotive Radar: 77GHz vehicle radar sensors, adaptive cruise control (ACC) systems
• Satellite Communication: GPS antennas, direct broadcast satellite (DBS) receiving modules
• Wireless Communication: 5G microstrip patch antennas, RF power amplifiers, band-pass filters
• Broadband Data Links: Cable data transmission modules, remote meter reading terminals
• Industrial & Consumer Electronics: High-frequency backplanes, voltage-controlled oscillators (VCO)

Rogers RO3003 High-Frequency CCL Knowledge & Technical Data

Basic Introduction to RO3003 CCL

Rogers RO3003 is a high-performance ceramic-filled PTFE composite laminate from the RO3000 Series, designed for commercial microwave and RF applications. It offers exceptional electrical and mechanical stability at a competitive cost, with consistent mechanical properties across different dielectric constants in the RO3000 Series, making it ideal for hybrid multilayer designs with FR-4.

Core Advantages of RO3003 CCL

1)Ultra-Low Dielectric Loss

Dissipation factor as low as 0.0010 at 10GHz, supporting applications up to 77GHz, ensuring minimal signal attenuation in broadband and high-frequency systems.

2)Stable Dielectric Constant

Dk = 3.00±0.04 (process) / 3.00 (design), with a thermal coefficient of Dk of -3ppm/℃(-50℃to 150℃), eliminating the step change in Dk seen in standard PTFE glass materials.

3)Matched Thermal Expansion

X/Y-axis CTE = 17ppm/℃, perfectly matched to copper, ensuring excellent dimensional stability and reliable surface-mounted assemblies.

4)Excellent PTH Reliability

Z-axis CTE = 24ppm/℃, maintaining stable interlayer connections in extreme thermal environments.

5)Standard Process Compatibility

Fabricated with standard PTFE PCB processing techniques (minor modifications required), compatible with lead-free assembly processes.

6)High Safety & Stability

UL 94 V-0 flammability rating, decomposition temperature (Td) = 500℃, low moisture absorption (0.04%), ensuring stable performance in harsh environments.

Complete RO3003 CCL Technical Parameters (From Official Datasheet)

RO3003 CCL Standard Configurations

Standard Thicknesses

• 0.005”(0.13mm)±0.0005”
• 0.010”(0.25mm)±0.0007”
• 0.020”(0.51mm)±0.0010”
• 0.030”(0.76mm)±0.0015”
• 0.060”(1.52mm)±0.0030”

Standard Panel Sizes

• 12”×18”(305×457mm)
• 24”×18”(610×457mm)
• 24”×21”(610×533mm) (for thin gauges)

Standard Cladding

• Electrodeposited Copper Foil:½oz (18μm), 1oz (35μm)
• Rolled Copper Foil:½oz (18μm), 1oz (35μm)

RO3003 CCL Application Matching with Hybrid PCB

RO3003’s low loss, high stability, and wide frequency bandwidth make it the optimal choice for the core high-frequency layer of the 4-layer hybrid PCB. When combined with TG170 FR-4, it achieves a balance between RF performance, mechanical reliability, and cost, fully meeting the requirements of commercial high-volume high-frequency products. The CTE matching with copper ensures the hybrid PCB avoids warpage during thermal cycling, while the low moisture absorption and high thermal stability guarantee long-term operational reliability in automotive, communication, and satellite environments.