IPC/JEDEC J-STDC. Handling, Packing,. Shipping and Use of. Moisture/ Reflow. Sensitive Surface. Mount Devices. A joint standard. IPC/JEDEC J-STDC-1 -. August IPC/JEDEC J-STDC -. February IPC/JEDEC J-STDB.1 includes Amendment 1 -. complies with ipc/JEDEc J-stDA. 3M™ HIC this card meets the IPC /JEDEC J-STD-. A standard. card size: 2” x 3” inches indicates: 5,10,15%.
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The key parameter in blistering of connector housings is the control of moisture absorption in the molded parts.
This delamination is commonly referred to as a “blister. The company compared three moisture measurement techniques: The next phase will be lead-free solder compliance for board assembly.
Some materials currently used may deform melt or show signs of delamination on the side walls, referred to as “blistering. Table 3 shows that, at the storage conditions of an air-conditioned warehouse in Southeast Asia Condition 1even the thinnest tested LDPE bag would provide enough moisture protection to keep the connectors below the blister threshold level for 90 days.
The higher the peak temperature, the lower the moisture content can be before blistering.
Minimizing Effects of Lead-free SMT Assembly on Connector Housing Resins
The higher preheat temperatures typical in lead-free solder profiles may provide more safety from blistering for thinner-walled parts than current tin-lead solder profiles due to the direct relationship between moisture desorption rate and temperature.
Many Asian OEMs, who have been converting to the lead-free solder process for the last few years, require that their connectors be packaged to minimize moisture absorption for this reason.
The company has analyzed the types of bags that are available for connector packaging and come up with some recommendations based jedfc WVTR ratings Table 2.
Approved options include clay and silica gel. Figures 1 and 2. These methods help avoid damage from moisture absorption and exposure to solder reflow temperatures that can result in yield and reliability degradation. They were subjected to two different storage conditions: Lead-free solders result in higher peak temperatures, meaning more blistering. This standard is not included in any packages.
Proceed to Checkout Continue Shopping. Your Alert Profile lists the documents that will be monitored. By using these procedures, safe and damage-free reflow can be achieved with the dry packing process, providing a minimum shelf 033a of 12 months from the seal date when using sealed dry bags.
J-STD Bake Conditions
Key to elimination of blistering is moisture control for most of the temperature-capable engineering resins used in connector housings. For standard MBB sizes used for shipping connectors loose or on reels the amount of desiccant required is less than two units. Effectiveness of desiccant on moisture absorption sstd packaged connectors. All techniques provided similar moisture percentages stdd parts. We have no amendments or corrections for this standard. This standard is also available to be included in Standards Subscriptions.
But the problems listed previously for connectors in these hot oven environments can also result in board rework. In this stage, the higher liquidus temperatures required for lead-free solders may have k profound effect on the connector insulator housings. As the voice of the U. The vapor pressure of moisture and other gases trapped inside the walls of a plastic connector increase rapidly when the connector is exposed to the high temperatures of solder reflow.
Many connector suppliers are eliminating, or have already eliminated, lead from their contact plating process.
Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. If all moisture absorption precautions are taken and connectors are still exhibiting some delamination during SMT assembly, measuring the amount of moisture in the parts to determine the steps required to solder without connector blistering may be required.
Blister onset temperature is dependent upon several factors, including wall thickness, percentage of moisture in the part, speed of connector heating, and peak temperature of the reflow process. MBBs in two different thicknesses 0. Please first log in with a verified email before subscribing to alerts. BoxEvansville, IN; Fax: Already Subscribed to this document.
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You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server. You may delete a document from your Alert Profile at any time. Subscription pricing is determined by: Higher temperatures required for lead-free SMT soldering will force a change from many currently used connector housing resins, which will melt, suffer pin retention failures or fail to meet jfdec stability requirements.
If the document is revised or h, you will be notified by email. For ease of use, the halogen moisture analyzer was considered the best. Please first verify your email before subscribing to alerts. Board assemblers have focused on handling more expensive ICs but have failed to take similar precautions ipx board connectors.