# 7400 series

> series of transistor–transistor logic integrated circuits

**Wikidata**: [Q265899](https://www.wikidata.org/wiki/Q265899)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/7400-series_integrated_circuits)  
**Source**: https://4ort.xyz/entity/7400-series

## Summary
The 7400 series is a series of transistor–transistor logic (TTL) integrated circuits. Developed by Texas Instruments, it originated in 1964 with the SN5400 and became a de facto standard for TTL logic. The series encompasses a wide range of logic functions and has been produced under various aliases and cloned by other nations, including the Soviet Union.

## Key Facts
- **Developer:** Texas Instruments.
- **Inception:** The series began in **1964** with the SN5400, followed by the SN7400 in **1966**.
- **Classification:** It is an **integrated circuit series** and functions as a **de facto standard** for transistor–transistor logic (TTL).
- **Instance Type:** Subclass of transistor–transistor logic.
- **Aliases:** Also known as the **5400 series**, 7400シリーズ汎用ロジックIC (Japanese), and 5400 серия (Russian).
- **Components:** Notable specific integrated circuits within the series include the **74595**, **7490**, **74163**, and **74125**.
- **Soviet Clones:** The series was extensively cloned in the Soviet Union under designations such as the 130, 133, 134, 136, 1533, 155, 158, 531, and 559 series.

## FAQs
### Q: Who developed the 7400 series?
A: The 7400 series was developed by **Texas Instruments**.

### Q: When was the 7400 series introduced?
A: The series originated in **1964** with the SN5400 model. The SN7400 model followed in **1966**.

### Q: What technology does the 7400 series use?
A: The 7400 series utilizes **transistor–transistor logic (TTL)**, serving as a de facto standard for this technology.

### Q: Were there international equivalents to the 7400 series?
A: Yes, the Soviet Union produced several series of TTL logic circuits that were clones of the original, such as the 130 series (SN54 clone) and the 133 series (54xx clone), starting as early as 1967.

## Why It Matters
The 7400 series represents a foundational building block in the history of digital electronics and computing. As a de facto standard for transistor–transistor logic (TTL), it provided a universal, interoperable set of components that engineers worldwide could rely on for constructing digital logic systems. Its widespread adoption is evidenced by its diverse aliases (5400 series) and the extensive replication of the technology by other nations, particularly the Soviet Union, which developed at least ten distinct series (such as the 1533 and 130 series) based on the original TTL design between 1967 and 1985. By standardizing logic functions—ranging from the simple 7400 quad NAND gate to complex counters and shift registers like the 7490 and 74595—this series accelerated the development of digital hardware and remains a historical benchmark for integrated circuit design.

## Notable For
- **Establishing Industry Standards:** Serves as a de facto standard for transistor–transistor logic (TTL).
- **Broad Component Range:** Includes essential logic ICs such as the 74595 (shift register), 7490 (counter), and 74163 (counter).
- **Global Impact:** The technology was adopted and cloned globally, most notably resulting in multiple series of Soviet TTL logic circuits (e.g., 133, 155, 531 series).
- **Longevity:** The series has persisted in various forms since its inception in the 1960s.

## Body

### Definition and Classification
The **7400 series** is a family of **integrated circuits** classified under **transistor–transistor logic (TTL)**. It is technically defined as an "integrated circuit series" and holds the status of a **de facto standard** within the electronics industry. The series is a subclass of TTL technology.

### History and Development
The 7400 series was created by **Texas Instruments**. Its timeline includes:
- **1964:** Inception of the series with the **SN5400**.
- **1966:** Introduction of the **SN7400**.
- **1976:** Production of specific units such as the Texas Instruments SN7400N.

### Notable Integrated Circuits
The series consists of numerous specific integrated circuits identified by their part numbers, including:
- **74595:** An integrated circuit (sitelink count: 2).
- **7490:** A class of integrated circuit (sitelink count: 2).
- **74163:** An integrated circuit (sitelink count: 2).
- **74125:** An integrated circuit (sitelink count: 2).

### Soviet Variants and Clones
The Soviet Union developed extensive equivalents to the 7400 series, categorized as "series of Soviet TTL logic circuits." These related series include:
- **130 Series:** An SN54 clone; research and development began in **1967**.
- **133 Series:** A clone of the original 54xx series; research and development began in **1967**, with industrial manufacturing starting in **1969**.
- **531 Series:** Research and development began in **1972**.
- **1533 Series:** Inception in **1985**.
- **136 Series:** Research and development began in **1967**.
- Other related Soviet series include the **131**, **134**, **155**, **158**, and **559** series.

### Identifiers and Aliases
The series is known by several aliases globally, including the **5400 series** (English), **7400シリーズ汎用ロジックIC** (Japanese), and **5400 серия** (Russian). It is cataloged under the GND ID **4738014-7**.

## References

1. Freebase Data Dumps. 2013