The SN54 / 74LS74A dual edge-triggered flip-flop utilizes Schottky TTL cir- cuitry to produce high speed D-type flip-flops. Each flip-flop has individual clear and. This device contains two independent positive-edge-trig- gered D flip-flops with complementary outputs. The infor- mation on the D input is accepted by the. 74LS74A datasheet, 74LS74A circuit, 74LS74A data sheet: TI – DUAL D-TYPE POSITIVE-EDGE-TRIGGERED FLIP-FLOPS WITH PRESET AND CLEAR.

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I prefer Digikey over Jameco as they have more parts, and the Priority Mail shipping is usually cheaper provided you don’t order anything to heavy.

PDF 74LS74 Datasheet ( Hoja de datos )

Many times you can get a small qty of common chips, shipped, 74ls74z a buck or two. The down side of Digikey is the site can be hard to navigate to find what you want, but once you get used to the parametric search it is actually pretty fast.

I am always impressed by the amount of knowledge that some of you all have! I actually did just that today, and ordered some from eBay.

In most cases, if the last numbers are not the same, then the IC is not plug-in compatible. I know from know on to just grab them from eBay with free shipping! Not all parts are the same. I had ordered a bunch of odds and ends from Jameco, so I ordered 74lss74a chips with that stuff, but man they kill you with shipping, and then it is slow to boot! This is where datasheets are VERY helpful.


You have to be careful because the suffix denotes packaging and you don’t want to get a SIP or surface found when you want DIP. Also, when you say inputs do you mean the number of flip flops or the actual inputs to the flip flop? Instead of waiting two weeks too, if I were you i’d just bite the bullet and order some of those particular chips.

The suffixes are often manufacturer-specific, so you’d need to consult that datssheet datasheet and hope it’s detailed. I always use US sellers only, and found one with free shipping. The datasheets are useful as far as packaging goes. If it had a standardyou may not be able to replace it with a 74LS74 depending on how many connections datashwet are to the output. When you start getting into TTL PROMs and older 8 bit CPUs, which are usually pretty expensive and have been discontinued for a fairly long time, 74s74a you need to verify what you are getting.

Definitely a learning experience. Same D type Flip Flops, but without the datahseet features of a Of course, maybe there is, and I am just too dumb to find it, lol. Okay, I will answer the why first. Data sheets are also 74ls7a4 helpful when replacing chips with one from a different family.

74LS74 Manufacturer, Function, Datasheet – Alldatasheet, IC D FLIP-FLOP, PDIP14, FF/Latch

The manufacturer sites are also good for getting specifics about what you want. Mouser is another good source as well. Thanks for the help, everyone. It would be nice if there was even a guide somewhere as to what the suffixes on some of these 74lls74a mean I have been trying to learn the datasheets on these things.


You have to be careful when mixing families due to drive capabilities. A good book for reference is the TTL Cookbook.


It is definitely frustrating at times, simply trying to digest all of this information. I don’t have a background in electronics, so it is all a learning experience. Quite often, at least one of the suffixes refers to the package. You dataheet really need to worry much about fakes for the standard TTL families, in my opinion.

I learned the hard way on some cheap TTL replacements from Mouser. If it’s cheap though a quarter there’s no incentive for it to be faked and usually you should be datashert.

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The middle two characters denote specific of the family. Thanks for the reply! It has a lot of great information.