Marking of Digital IC chips

There are currently huge amounts of different digital IC chips available in the market, starting from the simplest logical elements and ending with processors and gate arrays (FPGA). Of course, there also are lots of IC manufacturers offering IC’s. Many of them are specialized and won’t be reviewed here. Let’s limit ourselves to smaller, more general digital chips, basically TTL 74series. This series is produced by many manufacturers like Texas Instruments (TI).
Common marking:

Manufacturer identifier indicates the manufacturer name;

Family – also indicates a temperature range:

  • 74 – commercial (0…70°C), while CMOS chips have a range of (-40…+85°C);
  • 54 – military where the working temperature range is (-55…+125°C);

Series code – up to three symbols:

  • none – standard TTL;
  • LS – Low power Schottky;
  • S – Schottky TTL;
  • ALS – Advanced Schottky TTL;
  • F – Fast TTL;
  • HC– high-speed CMOS;
  • HCT – High-speed CMOS with TTL inputs;
  • AC – Advanced CMOS;
  • ACT – Advanced CMOS with TTL inputs;
  • BCT – BiCMOS technology;
  • ABT– Advanced BiCMOS Technology;
  • LVT – Low Voltage Technology with low voltage power source;

Identifier of special type – two symbols that can be excluded;

IC type – IC type describing its function;

Package type:

  • N – plastic DIL (DIP);
  • J – ceramic DIP;
  • T– flat metal.

For instance SN74ALS373, SN74ACT7801, SN7400.

4 Comments:

  1. Pingback: Electronics-Lab.com Blog » Blog Archive » Marking of Digital IC chips

  2. Hi there, thanks for the intro. I am having trouble locating a transistor and IC. They are S193 and RQ8237, respectively. S193 I believe is a power transistor and RQ8237 is a 14 pin IC. The transistor has a marking on it that looks like a T. and the IC has an M (Motorola ?). Anyways, I have been searching for a while to no avail. Any help would be appreciated.

    Thanks again,
    Bill

  3. Bill,
    Are these parts used with a GM wiper delay module? I’ve been looking for these also. I have 4 of these modules and none of them work. The GM part numbers of the modules are either 14013166 or 14056557. The circuit boards have the S193 3-pin transistor and the 14 pin IC. I think the S193 is a voltage regulator but that is a guess. On 2 of them, the 14 pin IC on mine is marked RQ8311 Motorola and above that it’s marked 85-6019-12. I’m not sure which is the part number on the IC. I’d bet one of those markings is a date or mfg code of some type. The IC in the other 2 of them is RCA CD4001BE which is available from Newark. I have not found any info on that S193 transistor.

    Ray

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