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: National Instruments (NI) provides a comprehensive paper titled "
IPC/JEDEC-9704 standard, titled "Printed Circuit Assembly Strain Gage Test Guideline," is a critical document for ensuring the reliability of SMT (Surface Mount Technology) components by standardizing how mechanical strain is measured during manufacturing and testing. Why IPC-9704 Matters
IPC-9704, titled Printed Board Assembly Strain Gage Test Guideline , is a technical standard published by IPC. It focuses on identifying and quantifying mechanical strain on PCBs during manufacturing and test processes.
IPC-9704 focuses on calculating the and Strain Rate . Principal Strain ( ipc-9704 pdf
standard that tells you what strain level your solder joints can survive. process monitoring
The standard is the global benchmark for printed circuit assembly (PCA) strain gage testing . Formulated jointly by the IPC and JEDEC , the document establishes standardized methodologies to measure mechanical stress during manufacturing, assembly, and test operations. Understanding its guidelines is critical for electronics manufacturers to eliminate field failures and optimize structural reliability. Core Purpose of IPC-9704
The IPC-9704 PDF is a comprehensive document that covers a wide range of topics related to high-reliability electronic assemblies. Some of the key sections and topics covered in the standard include:
The standard details how to execute a precise strain test. The process follows several distinct phases. Gage Selection and Placement The copper pad tears away from the resin substrate
This guide provides detailed information on the design, manufacture, and testing of PCBs for high-reliability aerospace and defense applications. It covers topics such as:
Pressing heavy connectors, heatsinks, or daughterboards into a PCB requires high insertion forces.
The standard specifies exactly how to set up your strain testing to ensure accuracy: Strain Gage Selection : Recommends three-element stacked rosette gages
). High strain rates mean the board bent rapidly, which is far more damaging to brittle solder formulations than slow bending. IPC-9704 vs. IPC/JEDEC-9702 It focuses on identifying and quantifying mechanical strain
: 12-bit minimum (16-bit recommended) with simultaneous sampling across all channels. Measurement Metrics
IPC‑9704 introduced a more sophisticated risk assessment framework than the older “500 με rule of thumb.” The standard categorizes assemblies into based on rigidity and material toughness:
Electronics must withstand mechanical stress during manufacturing, testing, and shipping. The standard provides guidelines for measuring this stress using strain gauges. This article explains the purpose, methodology, and implementation of IPC-9704 to help you protect printed circuit board assemblies (PCBAs) from mechanical failure. What is IPC-9704?
Eliminate latent defects that pass initial electrical testing but fail prematurely in the hands of the end-user. Why Strain Testing is Critical in Modern Manufacturing