IEC 61189-2-719:2016

Overview

IEC 61189-2-719:2016 is an international standard published by the International Electrotechnical Commission (IEC). It specifies precise test methods for measuring the relative permittivity and loss tangent of materials used in printed boards and other interconnection structures. These parameters are crucial for evaluating the electrical performance of printed board materials in the frequency range of 500 MHz to 10 GHz, which is particularly relevant for high-frequency electronic applications.

This standard applies to copper clad laminates typically used in printed circuit boards (PCBs), ensuring consistent and reliable testing of dielectric properties across the electronics industry. It is an important reference for manufacturers, quality control engineers, and testing laboratories involved in the production and characterization of PCB materials.

Key Topics

• Test Scope and Frequency Range
  IEC 61189-2-719 covers materials with relative permittivity values approximately between 2 to 10, and loss tangent values ranging from 0.001 to 0.050. Testing is conducted within the microwave frequency band of 500 MHz to 10 GHz, a critical range for RF and high-speed digital circuits.

• Test Specimens
  Specimens must be copper clad laminates, cut at least 25 mm from sheet edges to avoid defects. The size of each specimen is standardized at 200 mm by 50 mm, with a thickness of 0.6 to 1.6 mm (commonly 0.8 mm), and copper foil thickness from 0.01 mm to 0.04 mm.

• Test Setup and Equipment
  The measurement setup involves two test boards-a conductive line board (Board A) and a copper foil board (Board B)-designed to interface with specialized test fixtures. The standard defines detailed parameters on board designs, test fixture configurations, and test equipment to ensure accuracy and repeatability.

• Measurement Procedure
  Relative permittivity and loss tangent are derived from measurements using vector network analyzers (VNAs) or equivalent equipment. The procedure includes calibrations, raw data acquisition, and specific formulae for calculating dielectric properties from test signals.

• Reporting Requirements
  Comprehensive reporting of test conditions, specimen characteristics, test equipment, measurements, and calculated values is mandated to maintain transparency and support quality assurance.

Applications

• Printed Circuit Board (PCB) Manufacturing
  The standard guides manufacturers in assessing dielectric properties of PCB base materials, essential for designing circuits with predictable electrical characteristics, especially at high frequencies.

• Material Selection and Validation
  Designers selecting substrates for RF or microwave applications benefit from IEC 61189-2-719 by obtaining reliable permittivity and loss tangent data to optimize signal integrity and reduce losses.

• Quality Control in Electronics Assembly
  Test labs use this method for routine verification of raw materials and laminated boards to ensure compliance with specified dielectric property ranges, supporting consistent product quality.

• Research and Development
  Academic and industrial R&D teams use these test methods to explore new materials and improve interconnection structures for emerging high-frequency technologies like 5G, IoT devices, and advanced computing hardware.

Related Standards

• IEC 60194: Printed board design, manufacture and assembly – Terms and definitions. This standard provides the fundamental terminology referenced by IEC 61189-2-719 for clarity and consistency.

• IEC 61189 Series: Other parts specify test methods for electrical materials and interconnection structures, covering mechanical, thermal, and electrical performance testing.

• International Electrotechnical Commission (IEC) Standards: Complementing IEC 61189-2-719 are various IEC standards focusing on electromagnetic compatibility (EMC), safety, and performance for electronic components and assemblies.

Keywords: IEC 61189-2-719, test methods, relative permittivity, loss tangent, printed boards, PCB materials, dielectric properties, high-frequency testing, 500 MHz to 10 GHz, copper clad laminate, electronics assembly, vector network analyzer, quality control, interconnection structures, electrical materials testing.