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.

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。

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. 通常封装完的元件在一般的环境下会吸收湿气。 如果由于气候原因、长时间存放、存放不妥当等，导致封装受潮了，则封装内部的水分会由于回流焊接加热时而发生汽化膨胀，从而可能导致封装内部的界面剥离或破裂， …

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 packaging and assembly process is based on a constant 30°C and constant relative humidity.

MSL（Moisture Sensitivity Level）标准是电子行业用来评估元件对湿气敏感程度的一套分类体系，它将元件根据其对湿气的敏感性分为8个不同的等级。 这些等级反映了元件在特定温湿度条件下可以安全存放的时间，而不会…

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.

MSL评级系统帮助电子制造商确定适当的处理、包装和使用湿敏设备（MSDs）的方法，以避免在回流焊接过程中吸收湿气造成的损害。 MSL 等级从 1 到 6 不等，MSL 1 是最不敏感于湿度的，而 MSL 6 是最敏感的。

The Moisture Sensitivity Level (MSL) indicates the floor life of the component, its storage conditions, and handling precautions after the original container has been opened. The permissible time (from opening the moisture barrier bag until the final sol

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.

2019年8月14日 · 湿度敏感等级（在电子行业中简称为“MSL”）定义了对于回流焊制程，一个元器件可以暴露在不高于86华氏度 (30摄氏度 (℃))，60-85%相对湿度的环境中的最长安全时间。