What Are the Key Benefits of a Smart Dry Cabinet for MSD Protection?

Moisture is one of the sneaky enemies in the electronics industry with particular reference to Moisture Sensitive Devices (MSD). A brief exposure to moist air can reduce the quality of soldering and cause hidden defects or shorten product's life. This is where the smart dry cabinet comes in. It maintains a controlled and low humidity for parts and helps prevent difficult-to-detect damage that will cost more in the long run. Small changes in the storage condition have already been observed to have a positive effect in many factories on rework and scrap rates.

Precise Humidity Control Below 15% RH

The primary function of a smart dry cabinet is to control moisture, and most of the Inductive-intelligent-moisture-proof-cabinet have 15%RH or lower humidity. This is important as moisture sensitive devices can begin absorbing moisture from the environment at a rate faster than people would think, particularly in tropical areas or rainy seasons.Inside the cabinet, moisture sensors are continually monitoring the humidity. If the air becomes a bit too damp the system responds immediately, by reducing the humidity. This happens without a lot of fuss and dust in the background, maintaining the stability of the components even in the presence of room changes during the day. It is not necessary to check it manually, minimising the possibility of human error in busy production areas.This is a significant factor in a real production line. For instance, a miniscule electronics shop which makes sensor boards would store parts in hermetically sealed plastic bins containing desiccant packs. At first it worked fine, but, after the boxes were opened too much, moisture began to escape in. Later they added a Intelligent-stencil-storage-cabinet which was set at approximately 10-15% RH. Following, they saw reduced solder defects and reworking in their laboratory tests. The change involved in it didn't have to do with increasing effort, but with maintaining consistent storage conditions.When it comes to everyday operations, it's as easy as this: determine the humidity levels based on the sensitivity of your components and let the system keep it there. The majority of teams store high-risk materials, such as ICs or PCBs in the lowest possible range; less sensitive materials can be stored just above the safe limit.Another helpful practice is to maintain the door to the cabinet shut for extended periods of time. When it opens, it will always blow in the fresh air and it takes a little time to recover. This is a small thing that helps the cabinet maintain a stable environment and helps to prevent the damage of parts through unnecessary handling processes.This consistent control will minimize hidden moisture damage which may only occur once the assembly or test has been completed.

Real-Time Monitoring and Alarm for Anomalies

Smart dry cabinets aren't only for dry air. It also allows for real time monitoring of environmental conditions. This is vital for items sensitive to moisture. Sensors are built in that continuously monitor humidity and temperature inside the cabinet. The system will respond to changes and display it on the screen right away.The benefit this provides is an early warning. If the humidity is beginning to rise due to the door being open for too long or the seal on the door isn't good enough, an alarm is sounded. This can be either a flashing light, a sound or ( in some cases) it's also sent to a monitor to tell management to respond as fast as possible. At one electronics manufacturing line operators were placing IC reels into a normal dry box that had no alert. One day there was a small door opening and moisture seeped into the box slowly. The following morning several reels were past the safe exposure and lost that time plus required extra inspection. Since using smart dry cabinets with alarms, problems are identified right away. The humidity level was out of spec so the seal was repaired before the components were destroyed.This type of feedback also makes the system easier to use in day to day work. Operators aren't guessing about whether the part has been damaged but can easily access information and/or the alarm systems. Changes in shift can now be monitored as well as the next team on duty can see if there was an unusual condition.Alarms, even if they are small, warrant attention as good practice. Repeat exposure will increase risk over time even if the rise in humidity is slight. Failure to sound alarms can mean considerable downtime and possible loss of stored parts.This real time monitoring and alarm helps to keep the storage controlled and not so reliant on human checks.

One-Slot-One-Part Management for ICs and BGA

Misplacing parts can easily occur in the case of IC and BGA parts, if the storage is not organized properly. To address this, one-slot-one-part management is created, in which a single slot in the cabinet is allocated for one type of component. The place of each reel/tray is fixed, thus no mixing of similar-looking parts.This reduces the chance of the operator picking the incorrect parts. In a busy production area it may be impossible to tell most of the ICs from each other-especially if they are in reels. If the wrong revision or package type is picked, assembly will fail, and the entire batch might need to be reworked. One-slot-one-part ensures that all the parts are stored in specific places, which are labeled, meaning the operator doesn't have to remember it or make notes.In reality, a PCB assembly line employed by a smartphone maker once experienced problems, where their similar BGA components were mistakenly switched. They were almost the same, and kept in open racks. The picking was then placed under control after the cabinet was relocated to a smart dry cabinet with fixed slots for each part number. The operator just scanned the barcode and the cabinet automatically directed the operator to the correct slot. The errors for wrong parts decreased significantly in a short span of time.There is another advantage of this: traceability. A specific part ID, lot number and storage history can be associated with each slot. If a component is removed, the system will log the user who removed it and the date. This will help to monitor usage during audits or quality checks.It is important to establish some rules for labelling for daily use. Although the system provides guidance to the user, it is still helpful to have labels on each slot for added safety. Teams will also benefit from organizing parts by project or product line, therefore, parts that are similar to each other will be grouped together within the cabinet.This kind of organized storage decreases confusion, quickens picking rates and maintains delicate ICs and BGAs in the more controlled atmosphere over time.

Data Logging for Compliance with IPC/JEDEC Standards

Humidity control is important in the electronics manufacturing industry, as is record keeping. Smart dry cabinets assist with this by data logging, providing information on what is happening in the cabinet over time. This covers humidity, temperature fluctuations, door opening and storage time for each batch of components.This type of logging could be useful for managing moisture sensitive devices in many factories in order to comply with IPC and JEDEC. The cabinet automatically logs automatically without reliance on human interpretation. Any problems that are found later on a board or solder can be linked back to storage conditions at that time.For example, a contract manufacturer was once asked by a customer why a small batch of an automotive control board failed. It seemed to be due to moisture damage, however, a good storage example was required. The logs stored on the smart dry cabinet clearly showed the conditions during that time. AllICs were stored within limits and a set amount of time had not elapsed. This gave an example and showed that a reflow oven problem was the cause and not a storage issue.Data logging also shows daily trends in the conditions of the cabinet. If there are particular times where humidity rises it means that managers can change their routine such as during shifts or when doors are frequently opened. It becomes easier to correct a procedure than a bad habit.It may be recommended that the logs are read regularly even more so than for audit purposes. Changes to door openings, or multiple spikes in humidity however small they are indicate a problem with procedures. These problems must be corrected before a large problem arises during production.Most systems can log this data into a report making audits run much more easily with a fully reliable and clear storage record instead of searching through paper records.If data logging can be relied upon it is much easier to understand a storage setup and QA can work with real information rather than theories.