Forum: SMT Production & Design
Thread: MSL Project
Date: March 09, 2012 04:10 AM
Author: Graham Cooper
Subject: MSL Project
Hi, I've been supplying Totech dry cabinets in the Uk for 10 years and in that time I've realised the only places to find the correct MSL level is on the dry pack the devices are shipped in or by spending hours on the internet or speaking to the device manufacturer. But, nowadays rather then tie up so much time our policy is to recommend that all BGAs, QFPs, QFNs, LEDS, TSOPs, LGAs and anything you are not sure about are stored in a dry cabinet such as the Totech SD or HSD range at less then 5% RH....because IPC JEDEC 33B.1 states that anything stored at less then 5% RH has an indefinite floor life. And even if you put damp devices in the Totech dry cabinets, because they can maintain ultra low humidity ( 0.5% )then they will dry out and be safe to process without baking. Totech has lots of data about drying times for different devices when they are put in their cabinets.
(http://www.smtnet.com/Forums/Index.cfm?CFApp=1&Message_ID=65988)
