The Mega 16 is in use in one of our products. The package used is DIP. The supply voltage to the IC is 5 volts and it uses 8MHz external crystal. The production manager of my company has informed that this IC is now obsolete. I did a quick search on Farnell and Digikey and found that they are available. I have found nothing on the internet that points in this direction. The issue is sensitive and I thought I should seek some expert advice and hence this post.
Digikey has some confusing information. In the link below they have mentioned that the oscillator is internal, however the same IC variant we have used in our product with external crystal. I am not sure how much we should suspect about the information on this site.
Also farnell had one in the list that was very expensive. The link is as under: -
I think the price is more likely for 10 IC ( I can not think any other meaning of "˜Tube 10' written in the heading)