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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Thanks for the reply! Also just order from U. Same 7ls74a type Flip Flops, but without the extra features of a In most cases, if the last numbers are not the same, then the IC is not plug-in compatible. 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 the temperature range i.

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

Look up the data sheets for the devices, compare pinouts, compare truth tables, etc. 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.

Full text of “IC Datasheet: 74LS74”

If it’s cheap though a quarter there’s no incentive for it to be faked and usually you should be alright. It would be nice if there was even a guide somewhere as to what the suffixes on some of these chips mean Lol, crap, I was thinking they had the same number of pins.


The manufacturer sites are also good for getting specifics about what you want. Datashdet 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 learned the hard way on some cheap TTL replacements from Mouser.

74LS74A Datasheet PDF Texas Instruments –

The middle two characters denote specific of the family. You have to be careful when mixing families due to drive capabilities. I don’t have a background in electronics, so it is all a datazheet experience. Thanks for the help, everyone.

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. I am fairly new to the hobby, but am really enjoying learning.

I had ordered a bunch of odds and datashfet from Jameco, so I ordered the chips with that stuff, but man they kill you with shipping, and then it is slow to boot! Hopefully, I will be answering the questions one of these days! It’s old however you can still find them on Amazon.


I hate to wait another week or two for one chip. A good book for reference is the TTL Cookbook. If it had a standard dwtasheet, you may not be able to replace it with a 74LS74 depending on how many connections there are to the output.

Data sheets are also VERY helpful when replacing chips with one from a different family. It has a lot datashfet great information. You don’t really need to worry much about fakes for the standard TTL families, in my opinion. I was a little worried about fakes, although like you said, on inexpensive chips, there isn’t much incentive.

Quite often, at least one of the suffixes refers to the package. I am always impressed by datasheey amount of knowledge that some of you all have! I always use US sellers only, and found one with free shipping.

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The datasheets are useful as far as packaging goes. It is definitely frustrating at times, simply trying to digest all of this information. Instead of waiting dataeheet weeks too, if I were you i’d just bite the bullet and order some of those particular chips.