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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Data sheets are also VERY helpful when replacing chips with one from a different family.

Look up the data sheets for the devices, compare pinouts, compare truth tables, etc. Definitely a learning experience. 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 have been trying to learn the datasheets on these things. Okay, I will answer the why first.

74LS74A Datasheet

It has a lot of great information. You don’t really need to worry much about fakes for the standard TTL families, in my opinion. Many times you can get a small qty of common chips, shipped, for a buck or two.

Mouser is another good source as well. The suffixes are often manufacturer-specific, so you’d need to consult that manufacturer’s datasheet and hope it’s detailed. Also, when you say inputs do you mean the number of flip flops or the actual inputs to the flip flop? I don’t have a background in electronics, so it is all a learning experience. I am fairly new to the hobby, but am really enjoying learning.


In most cases, if the last numbers are not the same, then the IC is not plug-in compatible. I had also previously used Mouser for some stuff, but they have to have the worst search on any site I have ever seen!

Should we ignore that they don’t have the same number of pins? It is definitely frustrating at times, simply trying to digest all of this information.

You have to be careful when mixing families due to drive capabilities. 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. Thanks for the help, everyone. Again, thanks for the information, everyone!

Lol, crap, I was thinking they had the same number of pins. If it’s cheap though a quarter there’s no incentive for it to be faked and usually you should be alright.

PDF 74LS74 Datasheet ( Hoja de datos )

Thanks for the reply! The datasheets are useful as far as packaging goes. It’s old however you can still find them on Amazon. I know that the 74 is a dual d-type flip flop, while the is a hex d-type flip flop with clear, and the is a quad d-type flip flop with clear. 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.

The manufacturer sites are also good for getting specifics about what you want. Wouldn’t the board just ignore the extra inputs? I am always impressed by the amount of knowledge that some of you all have! I always use US sellers only, and found one with free shipping. Same D type Flip Flops, but without the extra features of a If it had a standardyou may not be able to replace it with a 74LS74 depending on how many connections there are to the output.


I know from know on to just grab them from eBay with free shipping!

74LS74A Datasheet PDF –

This is where datasheets are VERY helpful. Quite often, at least one of the suffixes refers to the package. I hate to wait another week or two for one chip.

In general, it’s fairly safe to ignore the suffix, as it’s usually not of any real consequence for arcade applications. I learned the hard way on some cheap TTL replacements from Mouser.

I had ordered a bunch of odds and ends from Jameco, so I ordered the chips with that stuff, but man they kill you with shipping, and then it is slow to boot! Not all parts are the same. It would be nice if there was even a guide somewhere as to what the suffixes on some of these chips mean It was frustration from knowing I have to place another order just for one chip!!!