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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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This is where datasheets are VERY helpful. It has a lot of great information.

If it’s cheap though a quarter there’s no incentive for it to be faked and usually you should be alright. Should we ignore that they don’t have the same number of pins? 74lz74a

If it had a standardyou may not be able to replace it 774ls74a a 74LS74 depending on how many connections there are to the output. Also just order from U.

Wouldn’t the board just ignore the extra inputs? Again, thanks for the information, everyone!

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

Not all parts are the same. Lol, crap, I was thinking they had the same number of pins. I actually did just that today, and ordered some from eBay. Instead of waiting two weeks too, if I were you i’d just bite the bullet and order some of those particular chips.

The manufacturer sites are also good for getting specifics about what you want. I hate to wait another week or two for one chip. 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, then you need to verify what you are getting. The suffixes are often manufacturer-specific, so you’d need to consult that manufacturer’s datasheet and hope it’s detailed.


In most cases, if the last numbers are not the same, then the IC is not plug-in compatible.

Hopefully, I will be answering the questions one of these days! You have to be careful when mixing families due to drive capabilities. I learned the hard way on some cheap TTL replacements from Mouser.

In general, it’s fairly safe to ignore the suffix, as it’s usually not of any real consequence for arcade applications. 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 vatasheet quad d-type flip flop with clear.

(PDF) 74LS74A Datasheet download

Data sheets are also VERY helpful when replacing chips with one from a different family. I know from know on to just grab them from eBay with free shipping! 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. A good book for reference is the TTL Cookbook. 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!

It’s old however you can still find them on Amazon. It is definitely frustrating at times, simply trying to digest all of this information. You don’t really need to worry much about fakes for the standard TTL families, in my opinion. I don’t have a background in electronics, so it is all a learning experience. Same D type Flip Flops, but without the extra features of a The middle two characters denote specific of the family.


Thanks for the reply! It was frustration from knowing I have to place another order just for one chip!!! 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.

Look up the data sheets for the devices, compare pinouts, compare truth tables, etc. I always use US sellers only, and found one with free shipping. I have been trying to learn the datasheets on these things.

74LS74A Datasheet

C most often vatasheet ceramic but TI uses J; some others used D P most often means plastic but TI uses N Another bit of data sometimes coded in the suffix is the temperature range i.

Many times you can get a small qty of common chips, shipped, for a buck or two. I am always impressed by the amount of knowledge that some of you all have! I had also previously used Mouser for some stuff, but they have to have the worst search on any site I have ever seen! Is there a reason I can’t sub one of these two for the 74?

Quite often, at least one of the suffixes refers to the package. Definitely a learning experience. Of course, maybe there is, and I am just too dumb to find it, lol.