EN 140401-802:2007/A1:2010

Overview

EN 140401-802:2007/A1:2010 is a European Standard detailing the specifications for fixed low power film Surface-Mounted Device (SMD) resistors with a rectangular shape. This standard classifies resistors into stability classes 1 and 2, defining strict performance and reliability criteria for these components. Developed and maintained by CENELEC (European Committee for Electrotechnical Standardization), this amendment A1 updates the original 2007 standard, reinforcing testing limits and compliance requirements.

This standard is essential for manufacturers, designers, and quality assurance professionals working with SMD resistors in electronic circuits, ensuring consistent resistor performance under various environmental and operational stresses.

Key Topics

• Fixed Low Power Film Resistors: The standard specifies film resistors designed for low power applications, emphasizing reliability and precision.
• Rectangular SMD Resistor Form Factor: Covers the physical outline and footprint of the resistors, critical for PCB layout and automated assembly processes.
• Stability Classes 1 and 2: Defines two classes based on long-term resistance stability and tolerance to environmental factors, catering to different application requirements.
• Resistance Change Limits: Sets limits on resistance variation under test conditions such as climatic testing, endurance at elevated temperature, overload sequences, damp heat, soldering heat, vibration, and substrate bending.
• Testing Procedures: References key IEC and EN testing methods for assessing electrical and mechanical performance, including:
  • Climatic sequence tests
  • Endurance at high temperature
  • Overload and rapid temperature change assessments
  • Damp heat and soldering heat resistance
  • Vibration and substrate bending tests
• Amendment Highlights: Tightening of the general stability definitions and updated normative references enhance the robustness of quality assessments and compliance procedures.

Applications

EN 140401-802:2007/A1:2010 is widely applicable across industries where fixed low power film SMD resistors are used, including:

• Consumer Electronics: Ensuring reliable and precise resistor performance in mobile devices, audio equipment, and home appliances.
• Automotive Electronics: Supporting stringent requirements in body electronics and control units where temperature stability and durability are critical.
• Industrial Equipment: Contributing to dependable performance in instrumentation, control systems, and automation hardware.
• Telecommunications: Enabling stable signal processing components in networking devices and infrastructure.
• Medical Devices: Providing resistance components meeting reliability and safety standards for diagnostic and monitoring equipment.

Related Standards

• EN 60115-1: General requirements for fixed resistors, referenced for test methods and endurance criteria.
• EN 60068-2-20: Environmental testing procedures focusing on solderability and resistance to soldering heat of components.
• EN 61193-2: Quality assessment systems that guide selection and use of sampling plans for electronic component inspection.
• EN 140400: Defines general stability class requirements relevant to fixed resistors, supporting the tightening measures in this amendment.

Adherence to EN 140401-802:2007/A1:2010 ensures that fixed low power film rectangular SMD resistors meet industry-recognized standards for stability and reliability. This contributes to improved product quality, operational efficiency, and long-term performance consistency in electronic assemblies.