History and Curiosity

Texas Instruments SN7400

The 7400 series is a popular family of transistor-transistor logic (TTL) integrated circuits (ICs).

In 1964, Texas Instruments introduced the SN5400 series of logic chips in a ceramic semiconductor package. In 1966, the SN7400 series (composed of four NAND logic gates with 40 transistors) in a low-cost plastic package was introduced, quickly capturing over 50% of the logic chip market and becoming a de facto standard electronic component. Since the introduction of the original bipolar transistor TTL components, pin-compatible components have been introduced with features such as low-power CMOS technology and lower supply voltages. Surface-mount packages exist for several functions of this popular logic family.

In the photo an example of an integrated circuit produced by Texas instruments, the first line indicates the type of integrated circuit SN7400N, the second line indicates the date of construction, the first two numbers indicate the year, the second two numbers indicate the week, therefore, 45th week of 1976. In the nearby photo there is a drawing of how a logic gate of the SN7400N is made