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Post as a guest Name. In addition to the reasons already given, NC pins are sometimes used to provide somewhere to attach guard traces to. The pin removal between C and D is to increase safety by maximizing distance creepage and clearance. You and two friends want to go somewhere, you get on a standard bus.
CD4066BC Datasheet PDF
You might want an oversize package for thermal performance or size of dieand as a result you end up picking a package with more pins than you need. The datasheet even lists this among its features: I understood few of your points and Datashset will work on to understand the rest!
Sign up using Facebook. What happens is, the silicon for the 4 output devices is the exact same as datashset an 8 output, except 4 pins are just labeled “NC” on the datasheet!
The reason comes out to be what the manufacturer of the chip guarantees and tests. 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.
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DBC Datasheet catalog
So that’s one alternative for “NC”. Also remember that price is directly proportional to feature set. Between its D pin and everything else you [periodically] datsaheet hundreds of volts of rectified mains voltage. Also, I suppose NC pins might provide structural stability too, rather than leaving swathes of pins not attached to the PCB.
Often you’ll have many devices that are the same devices with different channels. I haven’t reviewed the dies or anything, but I am absolutely convinced that some devices of the same class in the same package have the same silicon layout with different wire bonding to selectively disable features, allowing more effective price discrimination for a smaller number of silicon layouts.
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 d4066bbc and guarantee those “NC outputs”, then nobody will realistically ever use it in products intended to be sold to the market. Not having a physical pin?
Selling DBC, DC, DG with DBC, DC, DG Datasheet PDF of these parts.
dtaasheet On some small fine pitch packages it’s difficult to get PCB traces between the pins to provide guard rings as required on very high impedance, low current inputs. 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”.
In addition to the other good reasons listed, I know that NC pins are sometimes also used when: Email Required, but never shown. 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.
In case they have no use to the end users and have no function, why are they given as pins instead of datashet just closed? Here’s another perhaps even more interesting example, the TOP which is both an example of pin duplication, and of the [rare] pin removal in the DIP package[s].
What is a “closed terminal”? It also means an increase in silicon size dd4066bc you have to add the additional bond pads to the die.
There can be several reasons. Well, that requires more time wire bonding. There are probably many more, but my fingers are tired. 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.
There may be performance related issues with bonding the extra pins stubs in high frequency circuits? The duplication is again done for the same reasons mentioned before. The die will not fit into a package with the appropriate number of pins.