150mil Rogers TMM13i 2-layer ENIG Bare Copper Custom PCB

150mil Rogers TMM13i 2-layer ENIG Bare Copper Custom PCB

Introduction

This is ahigh-performance 2-layer rigid PCB built on Rogers 150mil TMM13i high-frequency ceramic-thermoset composite substrate, finished with ENIG (Electroless Nickel Immersion Gold) surface treatment and qualified to IPC-Class-2 standards. This 150 mil Rogers board is engineered for mission-critical RF, microwave, satellite communication, radar, and high-precision test applications requiring stable dielectric performance, matched thermal expansion, robust mechanical integrity, and long-term reliability under extreme thermal and chemical environments. Unlike standard FR-4 or low-performance microwave laminates, thisTMM13i PCB combines the electrical advantages of ceramic substrates with the manufacturability of conventional thermoset PCBs, eliminating the need for specialized PTFE-style processing while delivering exceptional high-frequency behavior.

1. PCB Construction Overview

This section summarizes the complete mechanical, electrical, and surface-finish configuration of the finished PCB, defining all critical fabrication parameters for performance and assembly compatibility.

2. PCB Stack-Up Structure

The following table defines the symmetric layer structure that ensures consistent electrical performance, mechanical stability, and uniform thermal distribution across the board.

3. PCB Layout & Net Statistics

This table summarizes component, pad, via, and net density to support assembly planning, design verification, and manufacturing yield analysis.

4. PCB Key Performance Advantages

4.1 High-Frequency Electrical Stability

TMM13i provides a tightly controlled isotropic dielectric constant Dk = 12.85±0.35 and dissipation factor Df = 0.0019 at 10 GHz, enabling predictable impedance control, low signal distortion, and high efficiency in microstrip and stripline circuits. Its low thermal coefficient of dielectric constant (TCDk =–70 ppm/°K) preserves electrical performance across wide operating temperatures, critical for radar, satellite, and automotive applications.

4.2 Thermal & Mechanical Reliability

The CTE of TMM13i is closely matched to copper: X-axis 19 ppm/°C, Y-axis 19 ppm/°C, Z-axis 20 ppm/°C over–55 to +288°C, minimizing thermal stress on plated through holes (PTHs) and vias during thermal cycling and reflow. The thermoset matrix prevents substrate softening at soldering temperatures, enabling reliable wire bonding without pad lifting or deformation. The material also exhibits high resistance to process chemicals, reducing damage during plating and etching.

4.3 ENIG Surface Finish Benefits

ENIG provides a flat, noble-metal surface ideal for fine-pitch SMT, QFN, BGA, and chip-on-board assembly. The nickel barrier layer (typically 3–6μm) blocks copper diffusion, while the thin immersion gold layer (0.05–0.15μm) preserves solderability during storage and multiple reflow cycles. ENIG supports Al wire bonding and offers excellent contact stability for RF signal pads and test points, making it superior to OSP, HASL, or immersion silver for high-reliability microwave assemblies.

Appendix: Rogers TMM13i CCL (Copper-Clad Laminate) Technical Knowledge Base

This section provides a detailed technical background on the core material, Rogers TMM13i. Understanding these properties is crucial for designers working with microwave and RF circuits.

1.Material Overview

Rogers TMM series (Thermoset Microwave Materials) are a family of ceramic-filled, hydrocarbon-based thermoset polymer composites. The "13i" designation indicates a target dielectric constant (Dk) of approximately 13, with the 'i' signifying isotropic electrical properties. Unlike traditional PTFE-based laminates, TMM materials are thermoset, meaning they undergo a permanent chemical change when cured, offering superior mechanical stability and processability.

Key Structural Traits

• Isotropic Dk for consistent 3D electrical performance
• Thermoset resin matrix (no melting during assembly)
• Ceramic filler for high Dk and stability
• Compatibility with standard PCB plating, drilling, and etching
• No sodium naphthenate pretreatment required before electroless plating

2.TMM13i laminate Data Sheet

3.Material Advantages Explained

3.1 Excellent Thermal Stability

TMM13i maintains stable Dk over temperature and frequency, supporting consistent performance in outdoor, aerospace, and automotive environments. Near-zero drift in dielectric properties preserves impedance and phase matching over the product lifecycle.

3.2 CTE Matched to Copper

Nearly identical expansion in X, Y, Z directions drastically improves PTH reliability under thermal shock and cycling. Vias and barrels resist cracking, ensuring long-term electrical connectivity in high-vibration and extreme-temperature environments.

3.3 Low Loss & High Efficiency

Df = 0.0019 at 10 GHz delivers low insertion loss and high energy efficiency, critical for high-power amplifiers, low-noise receivers, and active antenna arrays. Reduced loss lowers heat generation and extends component life.

3.4 Mechanical Ruggedness

High flexural modulus and resistance to creep/cold flow maintain dimensional stability during processing and assembly. The substrate does not deform under heat or pressure, supporting precision etching and fine-line geometries.

3.5 Standard PCB Processing

Unlike high-performance PTFE materials,TMM13isubstrate uses standard drilling, desmear, plating, and soldering without costly modifications. This lowers production cost, shortens lead times, and improves yields.

4. Standard Specifications

4.1 Thickness Options

0.015”, 0.025”, 0.030”, 0.050”, 0.060”, 0.075”, 0.100”, 0.125”, 0.150”, 0.200”, 0.250”, 0.500”(±0.0015”)

4.2 Standard Panel Sizes

18”×12”(457 mm×305 mm), 18”×24”(457 mm×610 mm); custom sizes available

4.3 Standard Cladding

½oz (18μm), 1 oz (35μm) electrodeposited copper; heavy copper and unclad options available

5. Ideal Applications for TMM13i

• Satellite communications & deep-space modules
• Automotive radar (77 GHz) & V2X systems
• 5G/6G high-frequency antennas & beamforming
• Dielectric lenses, polarizers, precision filters
• Chip test sockets & load board substrates
• Military radar, ECM, and avionics
• High-reliability wire-bonded RF assemblies

Performance vs. Conventional Materials

• vs. FR-4: Far higher Dk, vastly lower loss, better thermal stability
• vs. PTFE/ceramic: Easier processing, better PTH reliability, no special plating etch
• vs. Alumina: Lower cost, better toughness, compatible with standard PCB assembly

Summary of TMM13i CCL Value

TMM13i laminate represents a best-in-class balance of electrical performance, mechanical robustness, thermal stability, and manufacturing practicality. It enables compact, high-efficiency RF/microwave circuits that perform reliably in demanding environments while remaining cost-effective to produce. When paired with ENIG surface finish, it forms a premium platform for next-generation communication, radar, test, and aerospace electronics.