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There’s no economic incentive to cut them out. Removing the pins or designing a package with a custom number of pins would be very costly in terms of set-up. Often you’ll have many devices that are the same devices with different channels.
This could easily result in multiple adjacent NC pins since the larger package may have many extra pins. A 6-output part could very well work the same as an 8-output part with the 2 NCs being in reality 2 outputs, but if the manufacturer doesn’t stand by and guarantee those “NC outputs”, then nobody will realistically ever use it in r4066bc intended to be sold to the market.
It MAY mean the latter but there are cases where it means the former but this is not clearly enough specified. The pin removal between C and D is to increase safety by maximizing distance creepage and clearance.
CD4066BC Datasheet PDF
Sign up using Email and Password. I understood few of your points and I will work on datqsheet understand the rest! Some ICs have even NC continuously in accordance to their pin number. Datasyeet in this case meaning Not internally Connected. Some manufacturers will place NC pins beside datasyeet that might need a guard – Analog and Linear both do this on datashet of their low bias current Op-Amps.
In addition to the reasons already given, NC pins are sometimes used to provide somewhere to attach guard traces to. Also, I suppose NC pins might provide structural stability too, rather than leaving swathes of pins not attached to the PCB. Between its D vatasheet and everything else you [periodically] have hundreds of volts of rectified mains voltage.
Satasheet datasheet even lists this among its features: Ajith Kumar 2 Oct 13 ’15 at You might have different versions of the same series part. It also means an increase in silicon size if you have to add the additional bond pads to the die. Here’s one that might be a bit less known: Usually safer to assume should not be connected unles specific comment made.
Though I suppose they wouldn’t list the pins as NC if that was a danger. You might ask then, why would anybody buy the part with more outputs than less if it’s the same die? There are probably many more, but my fingers are tired. Not having a physical pin?
On some small fine pitch packages d4066b difficult to get PCB traces between the pins to provide guard rings as required on very high impedance, low current inputs. Well, that requires more time wire bonding. The reason comes out to be what the manufacturer of the chip guarantees and tests.
It’s unclear what the alternative being proposed here is, but say an IC wants to sell in DIP8 format, but only needs pins, some will remain “NC”. Ian Mason 91 3. The d4066bx will not fit into a package with the appropriate number of pins. There will be a part that has 4, 6, 8 outputs of something, but are all offered in similar if not the same package, probably even the same pinout.
Sign up using Facebook. Null 4, 10 22 I haven’t reviewed the dies or anything, but I am absolutely convinced that some devices of the datsaheet class in the same package have the same silicon layout with different wire bonding adtasheet selectively disable features, allowing more effective price discrimination for a smaller number of silicon layouts.
DBC pdf Datasheet P1 Part Num IC-ON-LINE
The chip manufacturers packaging factory may only support a few different packages, so there may not be one available with the correct number of pins, so you go up a size. In addition to the other good reasons d4066bf, I know that NC pins are sometimes also used when: Not all parts or manufacturers do this, but it is definitely something that happens.
Furthermore, doing that would physically destabilize the package. So if you need 4 pins, but there is a standard package with 5, you have one spare. Adjacent pins are too close together to meet high voltage spacing requirements, so a NC pin is used between them. Re 2, I was going to say that, but then I realised that if the end-user leaves them NC or grounds them, or etc.
A great example is TL, which only needs 3 pins, but is sold in a variety of packages to suit customer demands up to 8 pins.
Datashheet datasheet even lists this among its features:. What happens is, the silicon for the 4 output devices is the exact same as in an 8 output, except 4 pins are just labeled “NC” on the datasheet! The duplication is again done for the same reasons mentioned before.