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. 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.

It would be nice if there was even a guide somewhere as to what the suffixes on some of 74ls7a4 chips mean 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? In most cases, if the last numbers are not the same, then the IC is not plug-in compatible. Same D type Flip Flops, but without the extra features of a I learned the hard way on some cheap Datashheet replacements from Mouser.

I actually did just that today, and ordered some from eBay. 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! A good book for reference is the TTL Cookbook.

PDF 74LS74 Datasheet ( Hoja de datos )

The suffixes are often manufacturer-specific, so you’d 774ls74a to consult that manufacturer’s datasheet and hope it’s detailed. The middle two characters denote specific of the family.


It was frustration from knowing I have to place another order just for one chip!!! Quite often, at least one of the suffixes refers to the package.

It has a dwtasheet of great information. Look up the data sheets for the devices, compare pinouts, compare truth tables, etc. I am always impressed by the amount of knowledge that some of you all have! 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. It’s old however you can still find them on Amazon.

Again, thanks for the information, everyone! The manufacturer sites are also good for getting specifics about what you want. Mouser is another good source as well.

Lol, crap, I was thinking they had the same number of pins. I always use US sellers only, and found one with free satasheet. Thanks for 74ls4a reply! You have to be careful when mixing families due to drive capabilities.

Not all parts are the same. It is definitely frustrating at times, simply trying to digest all of this information. 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. Thanks for the help, everyone. I am fairly new to the hobby, but am really enjoying learning. Hopefully, I will be 47ls74a the questions one of these days!

Of course, maybe there is, and I am just too dumb to find it, lol. Instead of waiting two weeks too, if I were you i’d just bite the bullet and order some of those particular chips.


Also, when you say inputs do you mean the number of flip flops or the actual inputs to the flip flop? The datasheets are useful as far as packaging 74ls74w.

74LS74A Datasheet PDF –

I know from know on to just grab them from eBay with free shipping! If it’s cheap though a 74ls74w there’s no incentive for it to be faked and usually you should be alright.

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 have been trying to learn the datasheets on these things. C most often means 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 datashert temperature range i.

This is where datasheets are VERY helpful. Okay, I will answer the why first. 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. Wouldn’t the board just ignore the extra inputs? In general, it’s fairly safe datsaheet ignore the suffix, as it’s usually not of any real consequence for arcade applications.

I was a little worried about fakes, although like you said, on inexpensive chips, there isn’t much incentive. I hate to wait another week or two for one chip. Also just order from U. Definitely a learning experience.