By Tom Seratti, President, SMT Supplies
I hear from many of our key local manufacturers that handling sensitive electronic devices, especially those vulnerable to Electrostatic Discharge (ESD) and moisture, requires special precautions. Without adequate protection, these devices can be easily damaged, resulting in costly repairs, replacements, or quality issues for end customers. Here, I’ll explore the best practices for safeguarding these sensitive devices during storage and transportation.
1. Understanding ESD and Moisture Sensitivity
Electrostatic Discharge (ESD) occurs when static electricity builds up and is released in a way that can damage electronic components. Sensitive electronic devices, especially those with smaller circuitries, are highly vulnerable to ESD damage, which can be latent and difficult to detect until the device is in use.
Moisture Sensitivity is a concern with specific devices that absorb moisture from the environment. When these devices are exposed to excessive moisture, they can undergo structural changes or internal short circuits, resulting in malfunctions. Such damage can also occur during the reflow soldering process if moisture-laden devices are exposed to high temperatures.
2. Storage Solutions for ESD and Moisture-Sensitive Devices
To keep sensitive devices safe, a multi-layered approach is often required:
- Anti-Static Bags and Containers: Use ESD-safe bags and containers that prevent static buildup. Pink or black anti-static bags are commonly used and should be chosen based on the sensitivity of the devices being stored. Containers made of conductive or dissipative materials offer additional protection by maintaining a uniform charge distribution.
- Humidity-Controlled Cabinets: For moisture-sensitive devices, humidity-controlled dry cabinets maintain low relative humidity levels, helping prevent moisture absorption. Look for cabinets with relative humidity controls under 10%, as this level is ideal for storing sensitive components over extended periods.
- Desiccant Packs and Humidity Indicators: In environments without controlled storage cabinets, consider using sealed moisture barrier bags with desiccant packs and humidity indicator cards. These help keep moisture levels in check and provide visual indicators for inspection.
3. Proper Handling Procedures During Transportation
Transportation can expose sensitive devices to a range of environmental risks. Here’s how to mitigate them:
- Protective Packaging: Use ESD and moisture-proof packaging materials for each layer. Shielding bags, bubble wrap, or foam can cushion and protect devices from physical shocks while maintaining a static-safe environment.
- Temperature Control: Some sensitive devices may require temperature control to prevent condensation or thermal damage. Ensure your logistics providers are equipped to handle temperature-sensitive shipments if required.
- Labeling and Handling Instructions: Mark packages with clear ESD and moisture-sensitive labels. Include instructions for handling and environmental conditions, ensuring that everyone along the supply chain is aware of the requirements.
4. Regular Monitoring and Testing
To guarantee the longevity and functionality of stored devices, it’s essential to monitor and test storage environments:
- Humidity and Temperature Logs: Use sensors and data loggers to track temperature and humidity levels in storage areas, ensuring they remain within safe ranges. Routine monitoring provides peace of mind and ensures you can take corrective actions if thresholds are exceeded.
- ESD Audits and Equipment Checks: Regularly check your ESD protection systems, including grounding straps, mats, and ionizers, to ensure they are functioning correctly. An annual or semi-annual [ESD audit] can help identify potential weaknesses in your protection strategy.
Conclusion
Properly managing ESD and moisture-sensitive devices is critical for maintaining quality in the electronics industry. At SMT Supplies, one of our key partners, SCS, has a dedicated line of ESD and moisture protection products. By understanding the risks, investing in high-quality protective solutions, and enforcing strict handling protocols, manufacturers and distributors can prevent damage, improve product reliability, and reduce overall costs. These proactive measures are a small investment that can yield significant savings and preserve your reputation in the long run.
If you are exploring solutions for ESD and Moisture Barrier storage and transportation of your products, contact SMT Supplies for expert advice tailored to your needs!