Relevant links from Mouser and Digi-key:
This is causing some confusion in our purchasing team. I could not find anything in the datasheets, so it seems to have no technical relevance.
It is related to packing.
The BC847C has these two "orderable part numbers":
As you can see, they are the same component in the same package (SOT23), but they differ by packing:
BC847C,215 is delivered as Reel 7" Q3/T4 (3 000 pieces)BC847C,235 is delivered as Reel 11" Q3/T4, LargePack (10 000 pieces)Another example, for the NXP CLRC 633, the datasheet lists these references (and more):
As you can see, the first two are both CLRC66301HN, both HVQFN32, but one is delivered on one tray, with an MOQ of 490 pieces, while the other is delivered as 5 trays, and the MOQ is 5 x 490 pieces.
The same applies for the next 3 which are all CLRC66302HN, all HVQFN32, but delivered as either 5 trays (MOQ 5 x 490), 1 tray (MOQ 490) or 1 reel (MOQ 6000).
Some retailers/distributors will sell the components in smaller quantities (they buy the larger reels/trays from the manufacturer and then pick the right quantities from each order or cut parts of the tape), while others will sell only the full trays/reels.
Depending on how many you need and any requirements for production it may or may not matter.
In the case of your Mouser link for instance, they order the 235 version, but allow you to buy either the full reel (10K pieces) or cut parts of the tape from 1 single component. They also have the 215 version, available as full reel (3K pieces) or cut tapes from 1 single component. If you need smaller quantities, it shouldn't matter which one you order, in this case the tape is exactly identical except for its length. You may end up with two different prices for exactly the same component based on whatever rule they have to compute the per-unit price from the full reel price/quantity. Here the difference is very small.
On a final note, the two links you provided point to two actually different references (BC547C and BC547CW) which are actually different components, with different packaging (SOT23 v. SOT323) and different characteristics (different \$P_{tot}\$). So the number after the comma (probably) doesn't matter, but the reference before it does!
They are not the same package. One is SOT23 and the other SOT323.
The numbers are probably in the datasheet, but this is a basic engineering talking to marketing dealing with production issue. Marketing should be talking to both.
From Mouser link:
If you google BC847C,235, you get:
Either BC847C,235 (Orderable part number - for us humans to remember) or 9335 896 00235 (12 digit code computers prefer) will get you that part.
All versions of the BC847C would have 9335 896 00 as a part number. Last 3, the 235 correspond to Packing.
From Digikey link:
Google BC847CW,135, you get:
And BC847CW,135 or 9340 217 80135 will get that part.
