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What is a “closed terminal”?

CD4066BC Datasheet PDF

Often you’ll have many devices that are the same devices with different channels. The datasheet even lists this among its features: It MAY mean the latter but there are cases where it means the former but this is not clearly enough specified. Null 4, 10 22 There may be performance related issues with bonding the extra pins stubs in high frequency circuits? Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

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You and two friends want to go somewhere, you get on a standard bus. You might have different versions of the same series part. I understood few of your points and I d4066nc work on to understand the rest! Not having a physical pin?


Adjacent pins are too close together to meet dahasheet voltage spacing requirements, so a NC pin is used between them. What do you mean by “in stead of being just closed”, i. Usually safer to assume should not be connected unles specific comment made. Furthermore, doing that would physically destabilize the package. 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.

There can be several reasons. You may then ask, why not just connect them to something?

D4066BC, D4066C, D4066G

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. 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 dwtasheet guarantee those “NC outputs”, then nobody will realistically ever use it in products intended to be sold to the market.

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. The pin removal between C and D is to increase safety by maximizing distance creepage and clearance.

DBC Datasheet catalog

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? The next larger standard package is used, resulting in unused pins. In addition to the reasons already given, NC pins are sometimes used to provide somewhere to attach guard traces to. There are of course different packages in which one such IC can be sold.


Sign up using Email and Password. With large packages you can have many spare 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”. Sign up or log in Sign up using Google. So if you need 4 pins, but there is a standard package with 5, you have one spare.

Also, I suppose NC pins datashewt provide structural stability too, rather than leaving swathes of pins not attached to the PCB. There’s no economic incentive to cut them out. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to datawheet policies.