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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”. What is a “closed terminal”?
CD4066BC Datasheet PDF
It MAY mean the datawheet but there are cases where it means the former but this is not clearly enough specified. The die will not fit into a package with the appropriate number of pins. Also remember that price is directly proportional to feature set. The datasheet even 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. With large packages you can daatasheet many spare pins.
Well, that requires more time wire bonding. So that’s one alternative for “NC”. 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.
Though I suppose they wouldn’t list the pins as NC if that was a danger. 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.
Here’s one that might be a bit less known: Often you’ll have many devices that are the same devices with different channels. On some small fine pitch packages it’s difficult to get PCB traces between the pins e4066bc provide guard rings as required on very high impedance, low current inputs. Oct 13 ’15 at Email Required, but never shown.
What happens is, the silicon for the 4 output devices is the datashee same as in an 8 output, except 4 pins are just labeled “NC” on the datasheet! It also means an increase in silicon size if you have to add the additional bond pads to the die.
DBC pdf Datasheet P1 Part Num IC-ON-LINE
There are probably many more, but my fingers are tired. Some ICs have even NC continuously in accordance to their pin number. 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. Not all parts or manufacturers do this, but it is definitely something that happens.
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. This an SMPS controller with integrated main switch. Furthermore, doing that would physically destabilize the package.
The next larger standard package is used, resulting in unused pins. Sign up or log in Sign up using Google. The reason comes out to be what the manufacturer of the chip guarantees and tests. Post as a guest Name. In addition to the other good reasons listed, I know that NC pins are sometimes also used when: 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.
Sign up using Facebook. 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 the market.
I understood few of your points and I will work on to understand the rest! NC in this case meaning Not internally Connected. This could easily result in multiple adjacent NC pins since the larger package may have many extra pins. Ian Mason 91 3. There may be performance related issues with bonding the extra pins stubs in high frequency circuits?
Between its D pin and everything else you [periodically] have hundreds of volts of rectified mains voltage. The pin removal between C and D is to increase safety by maximizing distance datwsheet and clearance. Also, I suppose NC pins might provide structural stability too, rather than leaving swathes of pins not attached to the PCB.
You and two friends want to go somewhere, you get on a standard bus.