Esd bag. Around a QFP tray piece wrapped in saran wrap.
Why did you bother, random AliExpress seller?
Idgaf this time I got these chips to decap. But next time I might want to actually put them on a board.
The other chips on the same order were taped to a piece of cardboard then put in a non-esd ziploc. Lovely.
Package shots of CH32V208RBT6 in 64-pin TQFP. Mitutoyo plan apo 5x LWD objective, low angle LED gooseneck illuminator for both shots.
Full res at:
https://siliconpr0n.org/map/wch/ch32v208rbt6/azonenberg_pkgtop_mit5x/
https://siliconpr0n.org/map/wch/ch32v208rbt6/azonenberg_pkgbot_mit5x/
I probably didn't need this much magnification for a package shot (I used to just use my phone, lol) but when you have a CNC microscope it's easy to just collect more data in case you might want to look at it later.
Here's the CH579M.
Top view is Mitutoyo plan apo 5x/0.14, bottom is Mitutoyo plan apo 10x/0.28. Same lighting setup as the CH32V208.
Sure enough, I saw something I would totally have missed at lower magnification. Check out the probe scrub marks! It looks like the factory test socket had little tiny two-pronged pogo pins on it.
https://siliconpr0n.org/map/wch/ch579m/azonenberg_pkgtop_mit5x/
https://siliconpr0n.org/map/wch/ch579m/azonenberg_pkgbot_mit10x/
@miermont Unlikely, probably just Y-shaped pogo tips to get a more firm contact.