25mil TF600-Based 2-Layer DK6.0 TF Series PCB with ENIG and Copper-filled Vias

25mil TF600-Based 2-Layer DK6.0 TF Series PCB with ENIG and Copper-filled Vias

This product description introduces a high-performance printed circuit board manufactured using TF600 thermosetting high-frequency laminate and finished with ENIG (Electroless Nickel Immersion Gold). Designed for demanding RF/microwave applications, this TF600 PCB combines exceptional electrical properties with mechanical stability and compatibility with standard PCB fabrication processes.

Below, the TF600 high frequency PCB construction details, stackup, and design statistics are presented in tabular form, followed by a comprehensive introduction to the TF600 copper-clad laminate (CCL) material.

1. Product Overview

The TF600 25mil ENIG PCB is a high-performance 2-layer rigid circuit board built on a specialized thermosetting high-frequency laminate composed of modified PTFE resin and micron-sized ceramic fillers, free of glass fiber cloth. It delivers exceptional microwave performance, temperature resistance, ultra-low dielectric loss, and stable dielectric constant consistency, while enabling standard drilling, plating, and lamination processes compatible with conventional FR-4 production flows. With a finished board thickness of 0.7mm and25mil (0.635mm) dielectric core, this PCB is optimized for compact, high-frequency designs where signal integrity, impedance control, and long-term reliability are critical. It adopts ENIG surface finishing, black top silkscreen, no solder mask on either side, andcopper-filled vias on designated IC pads to enhance thermal conduction, grounding performance, and assembly stability.

2. PCB Construction Details

This section summarizes the mechanical, electrical, and surface finishing specifications that define the board’s physical and processing characteristics.

3. PCB Stackup

The following table defines the layer structure and material thickness of this2-layer TF600 PCB, ensuring stable impedance and consistent high-frequency transmission.

4. PCB Statistics

This table summarizes the circuit layout scale, pad distribution, and interconnection structure for quick design and assembly evaluation.

5. Manufacturing & Quality Standards

• Artwork Format: Gerber RS-274-X
• Accepted Standard: IPC-Class-2
• Availability: Global supply
• Assembly Compatibility: Lead-free reflow compatible up to 260°C

TF600 Copper-Clad Laminate (CCL)–Detailed Material Knowledge Base

The following section provides a complete technical overview of TF600 CCL, the core material used in the 25mil TF600 PCB above. This thermosetting, ceramic-filled PTFE laminate is engineered for high-reliability RF and microwave applications. It balances excellent electrical performance with FR4-compatible processing (drilling, plating, lamination), enabling cost-effective manufacturing without compromising high-frequency behavior.

1.Material Introduction

TF600 is a high-performance thermosetting high-frequency laminate based on modified PTFE resin reinforced with micron-sized ceramic fillers, formulated without glass fiber cloth. It achieves an optimal balance among ultra-low insertion loss, stable dielectric constant, high thermal resistance, and standard PCB processability. By adjusting the ratio of ceramic to PTFE, dielectric constant can be precisely tuned for various RF/microwave designs. TF600 supports 260°C lead-free assembly and provides excellent thermal stability, low moisture absorption, and long-term durability, making it a leading choice for high-reliability RF, microwave, and millimeter-wave applications.

2.Naming conventions:

TF: Unclad dielectric substrate

TF-1: Single-sided copper clad

TF-2: Double-sided copper clad (used in this PCB)

The TF600 grade used in this PCB has a nominal DK of 6.0 at 10 GHz, making it suitable for RF impedance matching and controlled dielectric environments.

3.TF600 CCL Full Datasheet Table

Below is a comprehensive datasheet for TF600, combining data from the provided documents and industry-standard test methods (IPC-TM-650, GB/T 12636-1990).

4.Available Thicknesses and Copper Weights

TF600 DK6.0 laminate is available in a range of thicknesses, with either 0.018 mm or 0.035 mm ED copper foil. The table below shows standard total thicknesses (including copper) or dielectric thickness–customers must specify which is required.

Standard panel sizes: 150×150 mm or 250×250 mm. Custom sizes available on request.

5.Key Performance Benefits

1)Ultra-Low High-Frequency Loss

Df = 0.0025 @10GHz ensures minimal signal attenuation, supporting long-distance transmission and high-sensitivity receiver systems.

2)Stable Dielectric Constant

Dk = 6.0±0.15 enables precise impedance control, critical for filters, power dividers, phase shifters, and antenna arrays.

3)Superior Thermal Stability

Tg >280°C, outstanding T260/T288 performance, and low CTE ensure reliability under lead-free assembly and extreme thermal cycling.

4)Minimal Moisture Absorption

≤0.06% water uptake preserves electrical performance in high-humidity environments and prevents delamination or CAF failure.

5)Good Process Compatibility

Drillable, plateable, and laminatable similar to FR-4, reducing production cost and cycle time compared to conventional high-frequency materials.

6)High Mechanical & Chemical Reliability

UL94 V0, strong peel strength, corrosion resistance, and anti-CAF performance support long-life aerospace, automotive, and satellite applications.

6.Material Structure & Features

• Composite System: Modified PTFE + micron ceramic filler, no glass fiber cloth
• Isotropic Dielectric Behavior: Uniform electrical properties in X/Y/Z axes
• Stable over Frequency & Temperature: Minimal Dk/Df drift from baseband to millimeter waves
• High Thermal Conductivity: Efficient heat dissipation for high-power RF amplifiers
• Low Outgassing & Radiation Resistance: Suitable for space and vacuum environments

7. Typical Applications of TF600 CCL

• Microwave and RF communication boards
• 5G/6G active antenna systems (AAS)
• Automotive radar, aerospace radar
• Satellite payloads and transceivers
• High-power amplifiers and filter modules
• Precision test and measurement instrumentation

Conclusion

The TF600 PCB 25mil ENIG represents a state-of-the-art solution for engineers requiring stable dielectric properties, low insertion loss, and reliable thermal performance in a compact 2-layer format. Its combination of a ceramic-filled PTFE core and ENIG finish ensures excellent solderability, corrosion resistance, and high-frequency signal integrity. When paired with the detailed understanding of TF600 CCL provided above, designers can confidently deploy this board in mission-critical RF, microwave, and high-reliability systems—from 5G infrastructure to aerospace radar.

For design validation, always refer to the full datasheet and conduct application-specific testing, as material behavior may vary with design and environmental conditions.