Quality and Reliability Assurance / Handling Precautions
2 Handling Precautions for Microcontrollers
2.1 Mounting Precautions
Plastics have basically porous feature. When a chip (especially an SMD which has a thin
plastic surface) is heated in a state of moisturized and is soldered by the reflow soldering
method, moisture is vaporized as the temperature rises to cause a package expanded. Or a
borderd surface between a lead frame and a plastic material is peeled off to cause a crack.
These bring serious troubles on reliability.
In order to prevent hygroscopity or enable high heat treatment after absorbing moisture,
Toshiba uses a dampproof packing and/or a heat proof tray.
(1) Recommended Methods of Soldering for Flat Packages
• Table 2.1 lists the recommended method of soldering flat packages. If you have
any question or request, please refer to “IC PACKAGE MANUAL” or contact
your local offices.
• For overall heating method, recommended mounting methods and
conditions after opening the pack differ depending on products to be
used. See Table 2.2 and 2.3 for the details.
• For locally heating a lead part, soldering iron method is
recommended. For other localized heating methods, refer to “IC
PACKAGE MANUAL” or contact your Toshiba local offices.
030901
QUA-5
2002-02-20