Most semiconductor products are rated MSL3 or higher. MSL 1 is the highest rating where it is considered as being not moisture sensitive even at 85% RH and components rated MSL1 do not require dry packing. The MSL rating is given after product qualification and determined by the materials used in its IC

Moisture sensitivity level (MSL) is a rating that shows a device's susceptibility to damage due to absorbed moisture when subjected to reflow soldering as defined in J-STD-020. It relates to the packaging and handling precautions for some semiconductors.

2023年2月18日 · 湿度敏感性等级：MSL，Moisture sensitivity level. 之所以有这个等级，大概是因为以下原因： 目的在于确定那些由湿气所诱发应力敏感的非密封固态表面贴装元器件的分类, 以便对其进行正确的封装, 储存和处理, 以防回流焊和维修时损伤元器件.

湿气敏感性等级(Moisture Sensitivity Level，MSL) 被用来定义 IC 在吸湿及保存期限的等级，若IC超过保存期限，则无法保证不会因吸收太多湿气而在SMT回 流焊时发生 POPCORN现象。

The Moisture Sensitivity Level (MSL) rating, Indicates the sensitivity of electronic components to moisture during the solder reflow process. It typically ranges from MSL 1 to MSL 6 and is specified by the component manufacturer in the datasheet.

In recognition of the varying degrees of popcorn cracking tendency of various package types, IPC/JEDEC defined a standard classification of moisture sensitivity levels (MSL's). The MSL's are expressed in numbers, with the MSL number increasing with the vulnerability of the package to popcorn cracking.

identify the classification l ev el of nonhermetic surface mount devices (SMDs) that are sensitive to moisture-induced stress so that they can be properly packaged, stored, and handled to avoid damage during assembly solder reflow attachment and/or repair operations. 开篇讲述了这份标准的目的，这非常重要，经常有人说MSL，但MSL是如何定义，这样定义的作用又是如何？

2016年4月26日 · Peak Body Reflow Temperature determined per JEDEC J-STD-020. Requires dry pack. & May observe delamination; classified MSL 1 per J-STD-020 Annex A Reliability Assessment. Hermetic package, not moisture sensitive.

Industry Standards IPC/JEDEC J-STD-020 and J-STD-033 to determine the moisture sensitivity level and corresponding floor life time for TI’s plastic package types. To quickly locate Moisture Sensitive Level (MSL) Rating and Peak Reflow information, search by part number using the Moisture sensitivity level search tool or see the device data sheet.

2023年12月18日 · Learn about the MSL levels and recommendations of the IPC/JEDEC J-STD-033 standard. SMT reflow soldering is a process in which SMD component packages are heated to temperatures above 200°C. If such an package contains a significant amount of moisture, heating it can cause a rapid release of moisture vapor.