# 254 series integrated circuits

> hybrid integrated circuits

**Wikidata**: [Q130466947](https://www.wikidata.org/wiki/Q130466947)  
**Source**: https://4ort.xyz/entity/254-series-integrated-circuits

## Summary
The 254 series integrated circuits are a model series of hybrid integrated circuits developed in the Soviet Union. Introduced in 1970, these components were manufactured by the Yerevan Computer Research and Development Institute. They are a class of miniaturized electronic circuits that were notably utilized in ES EVM computer systems.

## Key Facts
- **Classification:** Instance of an integrated circuit series and a subclass of hybrid integrated circuits.
- **Inception:** The series was established in 1970.
- **Country of Origin:** Soviet Union.
- **Manufacturer:** Yerevan Computer Research and Development Institute.
- **Primary User:** Used by ES EVM (a series of mainframe computers).
- **Compliance:** Follows the Soviet integrated circuit designation standard.
- **Technology:** Combines different semiconductor devices and passive components on a substrate.

## FAQs
### Q: What type of technology is used in 254 series integrated circuits?
A: They are hybrid integrated circuits, which means they are miniaturized electronic circuits that combine different semiconductor devices and passive components mounted on a common substrate.

### Q: Who manufactured the 254 series integrated circuits?
A: These components were manufactured by the Yerevan Computer Research and Development Institute in the Soviet Union.

### Q: What computer systems utilized the 254 series?
A: The 254 series integrated circuits were used by the ES EVM, a series of mainframe computers.

## Why It Matters
The 254 series integrated circuits represent a specific era of Soviet electronic engineering and computer hardware development. Emerging in 1970, this series illustrates the technological transition toward miniaturization through hybrid technologies, serving as a critical component in the ES EVM mainframe systems. The existence of this series highlights the specific role of the Yerevan Computer Research and Development Institute in the broader Soviet computing supply chain. By complying with Soviet integrated circuit designation standards, the 254 series helped standardize electronic components across the USSR's computer industry, facilitating the maintenance and scalability of mainframe computing infrastructure during the Cold War era.

## Notable For
- **Hybrid Construction:** Distinguished as a series of hybrid integrated circuits rather than monolithic ones, combining distinct components on a substrate.
- **Mainframe Integration:** Specifically identified as a component used in ES EVM mainframe computers.
- **Soviet Standardization:** Adhered to the strict Soviet integrated circuit designation system.
- **Regional Manufacturing:** A notable product of the Yerevan Computer Research and Development Institute.

## Body

### Technical Classification
The 254 series is technically classified as a **hybrid integrated circuit**. This category of electronic circuit is characterized by its construction method, which involves combining various semiconductor devices along with passive components (such as resistors and capacitors) onto a single substrate. This differentiates it from monolithic integrated circuits where the entire circuit is fabricated on a single piece of semiconductor material.

### Manufacturing and Origins
The series originated in the **Soviet Union** in **1970**. The sole identified manufacturer for this series is the **Yerevan Computer Research and Development Institute**. This entity was responsible for the design and production of the miniaturized circuits, contributing to the Soviet Union's domestic electronic capabilities during the 1970s.

### Application and Standards
The 254 series was developed in compliance with the **Soviet integrated circuit designation** system. Its primary application was within the **ES EVM** (Yedinaya Sistema Elektronnykh Vychislitelnykh Mashin), a series of mainframe computers that were compatible with the IBM System/360 and subsequent architectures. The 254 series provided the necessary electronic logic and support functions for these larger computing systems.