Hi Steve,
I think that 1/3 is an error. Microchip only defines their criteria for
MSL-1 and MSL-3:
https://www.microchip.com/wwwproducts/Rohs/

This report lists pretty much all of their QFPs as being MSL-3:
http://ww1.microchip.com/downloads/en/EnvironmentalInformation/Package%20Qualification%20Summary%20report%205_15_18.pdf

T

On Tue, Jul 10, 2018 at 11:05 AM, Steve Gregory <[log in to unmask]> wrote:

> Hi All,
>
> I just ran across something that was brought to my attention about the MSL
> rating for a Microchip TQFP80 part, PN# PIC24FJ256GA108-I/PT
> <https://analytics.supplyframe.com/trackingservlet/track/?r=
> gPVv3S5fz9WS0muSSENj7rO6t8VXvQgK1rcMoyYTG0FvQlD0DIEzVjQKFnEX
> zjwd-qWoH4WrGz915jp9zrn-G-x_qSIVtc8zbLug-SAwCiq0p74rp1VjbJ2KwYhfTKtPqXx
> cTKsKZYCGGxofwy72prM2kZSCtGHPF0yQzQAytU_QVib44Cu-IBWW40DIyeoDrEQTNcmOi-
> iuSYSbwoo9uOWkwMsYOgLpgGtKwmlenCQ2qMUd-IluZU4hJMiMAwmQlvALZwlfnfe9p0y
> 3-ada-0yro_rIN4ri1yG9W-ZAXgWcwuQI3v44ByozahmNdDu-
> pP83qBz7C1LvOj23z4u80ql5EFxO_M1uaNi8HamPkYIv5nst4jWzwTx9kLe
> 371AdpR1Zade37d-Lbj994RtcoMlt-_tywF_Sm-fI_q-cK0pdzb47WLG3M1qI1PK3dWAQdVdSo
> ATlHSFiOVsTCt_saqPqKUpH5GxSz0S4qHYNHBJVeAvg0srqjam2tMTKtH_4ep6RpxaZMva-
> 9pU_Ey3iAJVT9HvW2kqUcoDZQO-bB3n0i_E50WvzT7FtGb8AY1fX6J8wP7q1t6XJ
> 9Y4gX2enmlUGVq5roSzf_LM_4qzxpZ1mlezG7b5aZxH2oGmw_vefrS7sZbKNHTFjh_
> Gdgyz4FHrdsp4ysX9vdVTIZyEMa-IrUGN_7E6JEROsA7dEt5NZikg5mrq17ntQe8
> y7r5_MjRGjrWr9d7d57c8NJ-HE_WJMCK9KvwQMbI2rzs_fn0ogzAshEeM8su_nJNSXQoJ6-
> WVWH9LR26AGY4y0d3PuCaOSBGsxFFiaSHOaBnl8Zc4tVZjXxT68gr9bJ8R3-
> PsNm7SjxGiIymxAijZ7Qb4quJc>
> the part came in from Future and they put a MSL1 label on it and the
> package wasn't sealed. One of our more knowledgeable technicians wanted to
> double check the rating because he knows that QFP's are normally MSL3 or
> higher. The Digikey page calls this a MSL3 part, but if you go to Avnet's
> page it gives this a 1/3 MSL rating...what is that? I have never heard of a
> 1/3 MSL rating. I have also looked at the 305-page datasheet and can't find
> a MSL rating in the Microchip documentation. Has anybody ever seen this
> before?
>
> Steve
>
> --
> Steve Gregory
> Kimco Design and Manufacturing
> Process Engineer
> (208) 322-0500 Ext. -3133
>
> --
>
>
>
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