hot 78633kttr voltage regulator with only 1 volt output (supposed to be 3.3) and thermal cam is showing a hot spot on the edge of this chip. i’m hoping to find digikey part number for replacement
also the 78633KTTR is obsolete and not available in small quantities, texas instruments told me there is a
new part with different pin out and i could solder wires to proper pad
would digikey have that part number?
thank you
Hello blueoceansurf7. We do have stock on the 78633KTTR (three pieces), Digi-key part number 296-39497-1-ND. There is stock on the same part in Marketplace from Rochester Electronics, but 91 pieces is their minimum order quantity. The only alternative I found from the Texas Instruments cross reference website was TPS78633KTTRG3, 296-50564-1-ND, but we have zero stock on this one.
thanks jenny, yes Rochester wants over 300$ for min order i only need 5😅
did you see the picture of the other chip? im looking for that part number too thanks.
its the one marked D9LQN
I am sorry. I am unable to find anything for this one.
The D9LQN is a Micron DRAM, part number MT46H32M16LFBF-6 IT:C. From here we get the marking code:
It is an obsolete part, but the MT46H32M16LFBF-5 IT:C is still an active part and in stock. This version of the part number comes in a tray. If needed, we also have the tape and reel and cut-tape versions here: MT46H32M16LFBF-5 IT:C TR
It would appear from the datasheet that the only significant difference between the two is that it is a slightly faster speed grade (5ns vs. 6ns), so it would likely work as a substitute in most applications.
awesome thanks
this dram sits next to another dram with sane part number on the same board, if i change one to a faster chip do you think it may cause problem? thanks for your help!
It’s unlikely to cause a problem, as the actual speed they run at is controlled by an external clock. Their switching frequency, therefore, will be the same. It does mean that the output signals from the device might be slightly quicker (rise time, fall time, propagation delay), so they will change at a slightly faster rate, but this should mean they should more easily meet minimum set-up and hold times.
The one area where it could conceivably be a problem is that, due to faster rise and fall times, it could generate a bit more dv/dt noise - a potential EMI issue. I would be surprised if this were significant, but every design is slightly different.
