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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In general, it’s fairly safe to darasheet the suffix, as it’s usually not of any real consequence for arcade applications. 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 always use US sellers only, and found one with free shipping. This is where datasheets are VERY helpful.

74LS74 | Part Number |

The manufacturer sites are also good for getting specifics about what you want. Okay, I will answer the why first. Data sheets are also VERY helpful when replacing chips with one from a different family.

Hopefully, I will be answering the questions one of these days! Again, thanks for the information, everyone! I actually did just that today, and ordered some from eBay.

Lol, crap, I was thinking they had the same number of pins. I hate to wait another week or two for one chip. You have to be careful because the suffix denotes packaging and you don’t want 74lss74a get a SIP or surface found when you want DIP. Also just order from U. I am always impressed by the amount of knowledge dataaheet some of you all have! I had also previously used Mouser for some stuff, but they have to have the worst search on 744ls74a site I have ever seen!


A good book for reference is the TTL Cookbook. Datasueet we ignore that they don’t have the same number of pins? Definitely a learning experience.

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. Thanks for the reply!

Same D type Flip Flops, but without the extra features of a The middle two characters denote specific of the family. I know from know on to just grab them from eBay with free shipping! Quite often, at least one of the suffixes refers to the package. Of course, maybe there is, and I am just too dumb to find it, lol. The datasheets are useful as far as packaging goes. It has a lot of great information. It is definitely frustrating at times, simply trying to digest all of this information.

Is there a reason I can’t sub one of these two for the 74?

Mouser is another good source as well. Wouldn’t the board just ignore the extra inputs? Not all parts are the same. It was frustration from knowing I have to place another order just for one chip!!! I was a little worried about fakes, although like you said, on inexpensive chips, there isn’t much incentive. Also, when you say inputs do you mean 74lz74a number of flip flops or the actual inputs to the flip flop?


In most cases, if the last numbers are not the same, then the IC is not plug-in compatible. You have to be careful when mixing families due to drive capabilities. I am fairly new to the hobby, dahasheet am really enjoying learning.

(PDF) 74LS74A Datasheet download

C most often means ceramic but TI uses J; some others used D P most often means plastic but TI uses N Another bit dafasheet data sometimes coded in the suffix is the temperature range i. It’s old however you can still find them on Amazon. You don’t really need to worry much about fakes for the standard TTL families, in my opinion.

Thanks for the help, everyone. I don’t have a background in electronics, so it is all a learning experience. I have been trying to learn the datasheets on these things.

Look up the data sheets for the devices, compare pinouts, compare truth tables, etc. I learned the hard way on some cheap TTL replacements from Mouser.