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So that’s one alternative for “NC”. The reason comes out to be what the manufacturer of the chip guarantees and tests. In addition to the other good reasons listed, I know that NC pins are sometimes also used d4066bcc 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.
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It MAY mean the latter but there are cases where it means the former but this is not clearly enough specified. Adjacent pins are too close together to meet high voltage spacing requirements, so a NC pin is used between them.
I understood few of your points and I will work on to understand the rest! You daasheet ask then, why would anybody buy the part with d406bc outputs than less if it’s the same die?
In addition to the reasons already given, NC pins are sometimes used to provide somewhere to attach guard traces to.
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.
Between its D pin and everything else you [periodically] have hundreds of volts of rectified mains voltage. Some manufacturers will place NC pins beside inputs that might need a guard – Analog and Linear both do this on some of their low bias current Op-Amps. Could you give an example of the IC with a lot of NC pins?
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Though I suppose they wouldn’t list the pins as NC if that was a danger. NC in this case meaning Not internally Connected. The duplication is again done for the same reasons mentioned before. What do you mean by “in stead of being just closed”, i. Oct 13 ’15 at 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.
So if you need 4 pins, but there is a standard package with 5, you have one spare. The datasheet even lists this among its features:.
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”. The next larger standard package is used, resulting in unused pins. Here’s another perhaps even more interesting dahasheet, the TOP which is both an example of pin duplication, and of the [rare] pin removal in the DIP package[s]. There’s no economic incentive to cut them out.
CD4066BC Datasheet PDF
The pin removal between C and D is to increase safety by maximizing distance creepage and clearance. In case they have no use to the end users and have no function, why are they given as pins instead of being just closed?
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.
It also means an increase in silicon size if you have to add the additional bond pads to the die. Post as a guest Name. What is a “closed terminal”? There will be a part that has 4, 6, 8 outputs of something, d4066gc are all offered in similar if not the same package, probably even the same pinout.
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. Also, I suppose NC pins might provide structural stability too, rather than leaving swathes of pins not attached to the PCB. Ian Mason 91 3.