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With darasheet packages you can have many spare pins. Removing the pins or designing a package with a custom number of pins would be very costly in terms of set-up. You might have different versions of the same series part. 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 chip manufacturers packaging factory may only support dataaheet few different packages, so there may not be one available with the correct number of pins, so you go up a size.
You may then ask, why not just connect them dafasheet something? Well, that requires more time wire bonding. It also means an increase in silicon size if you have to add the additional bond pads to the die. There may be performance related issues with bonding the extra pins stubs in high frequency circuits?
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”. There’s no economic incentive to cut them d4066bx.
Furthermore, doing that would physically destabilize the package.
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There datawheet of course different packages in which one such IC can be sold. A great example is TL, which only needs 3 pins, but is sold in a variety of packages datwsheet suit customer demands up to 8 pins.
You’ll see in the image below that in some packages several pins are used for a given function duplicated to increase allowable current etc. So that’s one alternative for “NC”. 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].
The duplication is again done for the same reasons mentioned before. The pin removal between C and D is to increase safety by maximizing distance creepage and clearance. This an SMPS controller with integrated main switch. Between its D pin and everything else you [periodically] have hundreds of volts of rectified mains voltage.
The datasheet d406b6c lists this among its features:. In addition to the reasons already given, NC pins are sometimes used to provide somewhere to attach guard traces to.
On some small fine pitch packages it’s difficult to get PCB traces between the pins to d406b6c guard rings as required on very high impedance, low current inputs. 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.
NC in this case meaning Not internally Connected. Often you’ll have many devices that are the same devices with different channels. 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. 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!
Not all parts or manufacturers do this, but it is definitely something that happens.
You might ask then, why would anybody buy the part with more outputs than less if it’s the same die? The reason comes out to be what the manufacturer of the chip guarantees and tests. 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 products intended to be sold to dztasheet market.
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Home Questions Tags Users Unanswered. Null 4, 10 22 Ajith Kumar 2 What do you mean by “in stead of being just closed”, i. Could you give an example of the IC with a lot of NC pins? What is a “closed terminal”? Not having a physical pin? You and two friends want to go somewhere, you get on a standard bus.
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Oct 13 ’15 at There can be several reasons. There are probably many more, but my fingers are tired.
I understood few of your points and I will work on to understand the rest! Also remember that price is directly proportional to feature set.
I haven’t reviewed the dies or anything, but Dataasheet 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.
Re 2, I dataxheet going to say that, but then I realised that if the end-user leaves them NC or grounds them, or etc. Though I suppose they wouldn’t list the pins as NC if that was a danger.
Also, I suppose NC pins dtasheet provide structural stability too, rather than leaving swathes of pins not attached to the PCB. It MAY mean the latter but there are cases where it means the former but this is not clearly enough specified.
Usually safer to assume should not be connected unles specific comment made. The datasheet even lists this among its features: In addition to the other good reasons listed, I know that NC pins are sometimes also used when: The die will not fit into a package with the appropriate number of pins. The next larger standard package is used, resulting in unused pins.
This could easily result in multiple adjacent NC pins since the larger package may have many extra pins. Adjacent pins are too close together to meet high voltage spacing requirements, so a NC pin is used between them.