Restricted fan-in capacity was a main restriction of RTL technology that was fixed by the launched of DTL technology into integrated circuitry by Signetics in 1962. DTL technology had a comparatively slow propagation delay because of the time it took for the base charge to go from the diode for the transistor to stop reacting. This issue was fixed by Transistor-Transistor Logic integrated circuit technology which overtook DTL pretty fast.

The best instance is of TTL integrated circuit technology is the extensive 7400 series and the Milspec counterpart 5400 series actually launched by Texas Instruments in 1964. It was commonly imitative by other integrated circuit producers and became a de facto industry standard pretty quickly. Also at the time of the military mostly bought the integrated circuits in flat-pack packages, commercial applications mainly use dual inline packages which were basically ceramic, but afterwards used lower-cost plastic.

Other bipolar integrated circuit technologies have Emitter Coupled Logic and Integrated Injection Logic. Emitter Coupled Logic was a bit quicker than TTL, but used considerably more power and created more heat. Integrated Injection Logic came afterwards for the SSI marketplace but afterwards made place in a niche in Very Large Scale Integration due to it had a performance similar to TTL with power usage about as low as the FET transistor-based Complementary Metal Oxide Semiconductor technology.

In 1968 RCA launched the 4000 series logic family depending on CMOS technology logic. It copied the functionality and pin mostly from the existing 7400 series TTL parts, but functioned at a lesser power and over a much wider i.e. 3V - 15V current range at the cost of lesser performance and improved cost.

At the time the 7400 series TTL came out as SSI with normal tens of transistors per integrated circuit, in the late 1960s advancements in the chip processing technology allow a family of Medium Scale Integration components with characteristically hundreds of transistors, each to be included to the series. The next era in the 7400 family with larger than a thousand logic gates per chip was then copied Large Scale Integration.

By the 1970s, the Very Large Scale Integration was created to explain chips with tens of thousands of logic gates, but for VLSI, TTL technology using too much static power and leaving too much heat. So for VLSI and subsequent eras, a switch was made from Bipolar to Field Effect transistors, and finally to CMOS for the lowest static power dissipation. Over time, as microprocessor chip sets, solid state memory, and Application Specific Integrated Circuits turned leading, the venerable 7400 series was moved to a lesser role mainly as signal buffers/drivers and as "glue" logic linking the larger integrated circuits to each other