# 1533 series integrated circuits

> series of Soviet TTL logic circuits

**Wikidata**: [Q115861518](https://www.wikidata.org/wiki/Q115861518)  
**Source**: https://4ort.xyz/entity/1533-series-integrated-circuits

## Summary
The 1533 series integrated circuits are a Soviet series of transistor–transistor logic (TTL) digital logic ICs. Introduced in 1985, the series is based on the Western 7400 series TTL family and follows the Soviet integrated circuit designation.

## Key Facts
- The 1533 series is a series of Soviet TTL logic integrated circuits (transistor–transistor logic).
- Inception: 1985 (reference: http://www.155la3.ru/k1533.htm).
- Country of origin: Soviet Union.
- Based on the 7400 series family of TTL integrated circuits.
- Uses dual in-line package (DIP) and Schottky diode technology.
- Instance of: integrated circuit series; subclass of: transistor–transistor logic and integrated circuit.
- Complies with the Soviet integrated circuit designation system.
- Aliases listed: 74ALS and 54ALS.
- Commons image available: https://commons.wikimedia.org/wiki/Special:FilePath/КР1533ИЕ5_Интеграл.jpg.
- Commons category: "1533 series integrated circuits".

## FAQs
### Q: What are the 1533 series integrated circuits?
A: The 1533 series are Soviet TTL digital logic integrated circuits introduced in 1985 and based on the 7400 TTL series. They were produced under the Soviet integrated circuit designation.

### Q: What technology and packaging do 1533-series parts use?
A: The series uses dual in-line package (DIP) packaging and incorporates Schottky diode technology as part of its design.

### Q: How is the 1533 series related to the 7400 series?
A: The 1533 series is explicitly based on the 7400 series of transistor–transistor logic integrated circuits, indicating design or functional compatibility with that family.

### Q: Under what designation system were the 1533 parts classified?
A: The 1533 series complies with the Soviet integrated circuit designation system.

## Why It Matters
The 1533 series represents the Soviet Union’s implementation of the widely used 7400-family TTL logic standard within its own semiconductor ecosystem. By adopting the 7400-series design principles and producing parts in dual in-line packages with Schottky diode technology, the 1533 line provided a standardized set of logic functions suitable for digital electronic designs under Soviet manufacturing and naming conventions. Its formal inception in 1985 and registration under the Soviet designation system make the series a clear example of cross-influence between Western TTL families and Soviet integrated-circuit practice. For researchers, historians, and engineers working with Soviet-era electronics, the 1533 series is a relevant identifier when identifying or sourcing compatible TTL logic parts and documentation from that period.

## Notable For
- Being a Soviet implementation of the 7400-series TTL logic family.
- Formal inception and documentation dated to 1985.
- Use of Schottky diode technology combined with DIP packaging.
- Conformance to the Soviet integrated circuit designation system.
- Aliasing to families noted as 74ALS and 54ALS in available records.

## Body

### Overview
- The 1533 series is described as a series of Soviet TTL logic integrated circuits.
- It is classified as an integrated circuit series and as transistor–transistor logic.
- The series is explicitly based on the 7400 series of TTL integrated circuits.

### History and Inception
- Inception year recorded as 1985.
- The inception reference listed: http://www.155la3.ru/k1533.htm.
- The series was published and catalogued under Soviet integrated circuit designation conventions.

### Technical Characteristics
- Logic family: transistor–transistor logic (TTL).
- Packaging: dual in-line package (DIP).
- Semiconductor features include the use of Schottky diodes.
- The series aligns with the functional and design lineage of the 7400 TTL family.

### Classification and Compliance
- Instance of: integrated circuit series.
- Subclass of transistor–transistor logic and integrated circuit.
- Complies with: Soviet integrated circuit designation.

### Naming and Aliases
- Documented aliases: 74ALS, 54ALS.
- The "1533" prefix identifies the series within Soviet naming practices.

### Media and Documentation
- Representative image: https://commons.wikimedia.org/wiki/Special:FilePath/КР1533ИЕ5_Интеграл.jpg
- Commons category: "1533 series integrated circuits".
- Sitlink count recorded as 1 in source metadata.

### Related Series
- Directly related to and based on the 7400 series of TTL integrated circuits (Western TTL family).

(End of entry.)

## References

1. [Source](http://www.155la3.ru/k1533.htm)