IEC 62047-40:2021

Overview

IEC 62047-40:2021 is an international standard developed by the International Electrotechnical Commission (IEC) focusing on micro-electromechanical (MEMS) inertial shock switches. Specifically, it defines the test methods and conditions for determining the shock switch threshold of normally open MEMS inertial shock switches. These devices, fabricated using MEMS technology, operate by closing or opening contacts based on acceleration thresholds, making them vital components in various semiconductor and sensor applications.

This standard ensures accurate, consistent characterization of the static and dynamic threshold levels of MEMS inertial shock switches, defining essential ratings, test systems, and procedures to verify performance under applied accelerations.

Key Topics

1. Scope and Definitions

• Covers normally open micro-electromechanical inertial shock switches, which transition from open to closed state under acceleration.
• Specifies static threshold (constant acceleration triggering closure) and dynamic threshold (impact acceleration triggering closure).
• Establishes terms such as contact resistance, closed/open state, and explains the technical operation of these switches.

2. Essential Ratings and Characteristics

• Recommended operating conditions including:
  • Temperature: -20 °C to +50 °C
  • Relative Humidity: 20% to 80% RH
  • Standard atmospheric pressure at test site
• Critical characteristics measured include:
  • Minimum and maximum static threshold acceleration
  • Minimum and maximum dynamic threshold acceleration
  • Contact resistance when closed

3. Test Methods Overview

• Static Threshold Testing
  Two principal methods are described for measuring the static threshold:

  • Test Method 1: Uses a centrifuge, open-closed test circuit, and a status indicator (e.g., lamp) to detect switch state as acceleration varies.
  • Test Method 2: Involves a centrifuge, reference accelerometer, and wireless data acquisition for higher accuracy and real-time monitoring of contact resistance and switch closure.

• Dynamic Threshold Testing

  • Utilizes a shock test apparatus with back-to-back mounting of the switch and reference accelerometer.
  • Data acquisition of impact acceleration and switch state ensures precise dynamic threshold determination.

Applications

IEC 62047-40:2021 is essential for manufacturers, testers, and developers working with MEMS inertial shock switches in various applications such as:

• Semiconductor Devices: Ensuring reliable switch actuation under threshold accelerations in electronic circuits.
• Safety and Impact Sensors: Verifying performance in automotive, aerospace, and industrial shock detection systems.
• Consumer Electronics: Enhancing device protection by accurate inertial switch testing for smartphones, tablets, and wearables.
• Wireless Data Collection Systems: Ensuring MEMS switches function correctly in environments relying on wireless sensor networks.
• Quality Control: Standardized test methods provide benchmarks for product certification, performance validation, and reliability assurance.

Related Standards

• IEC 62047 series - covers various aspects of micro-electromechanical (MEMS) semiconductor devices.
• ISO and IEC Electropedia - terminological databases referred to for standardized definitions.
• IEC 60950 and IEC 61000 series - related to safety and electromagnetic compatibility of semiconductor devices.
• Industry-specific standards related to semiconductor device testing and qualification.

Keywords: IEC 62047-40, micro-electromechanical inertial shock switch, MEMS, semiconductor devices, static threshold testing, dynamic threshold testing, micro-electromechanical systems, shock switch threshold, contact resistance, accelerometer, quality assurance, semiconductor testing standards.

This standard is pivotal in ensuring the reliable performance and precise characterization of MEMS inertial shock switches, fostering international consistency in manufacturing and testing methods for advanced semiconductor and micro-electromechanical devices.