# 247 series integrated circuits

> two distinctly different series of hybrid integrated circuits (one would become 447 series)

**Wikidata**: [Q120056256](https://www.wikidata.org/wiki/Q120056256)  
**Source**: https://4ort.xyz/entity/247-series-integrated-circuits

## Summary
The 247 series integrated circuits are a model series of hybrid integrated circuits developed in the Soviet Union. They were utilized primarily in telecommunications and avionics. The series is distinguished by comprising two distinctly different types of hybrid circuits, one of which eventually evolved into the 447 series.

## Key Facts
- **Classification**: Instance of an integrated circuit series; subclass of hybrid integrated circuit.
- **Origin**: Developed and manufactured in the Soviet Union.
- **Compliance**: Designed in accordance with the Soviet integrated circuit designation standard.
- **Applications**: Primary use in telecommunications; secondary use in avionics.
- **Development**: Developed by Avangard.
- **Manufacturing**: Manufactured by Horizont (primary) and Avangard (secondary).
- **Evolution**: Encompasses two distinct series, one of which became the 447 series.
- **Technology**: Utilizes hybrid integrated circuit technology, combining semiconductor devices and passive components on a substrate.

## FAQs
### Q: What type of technology is used in the 247 series?
A: The 247 series uses hybrid integrated circuit technology. This involves miniaturized electronic circuits that combine different semiconductor devices and passive components attached to a substrate.

### Q: Who manufactured the 247 series integrated circuits?
A: The circuits were manufactured by two entities: Horizont and Avangard. Avangard is also credited as the developer of the series.

### Q: What is the connection between the 247 series and the 447 series?
A: The 247 series consists of two distinctly different series of hybrid integrated circuits. One of these two distinct series was later reclassified or developed into the 447 series.

### Q: What industries used the 247 series?
A: The series was designed for use in the telecommunications and avionics industries.

## Why It Matters
The 247 series integrated circuits represent a specific classification of Soviet electronics history, illustrating the complexity of their component numbering systems. As hybrid integrated circuits, they bridged the gap between monolithic integrated circuits and discrete components, offering specific advantages for the robust requirements of the era. Their usage in critical sectors like avionics and telecommunications highlights their reliability and importance in Soviet infrastructure. Furthermore, the series serves as a historical precursor to the 447 series, showing the evolutionary path of Soviet electronic component standardization. The fact that the series designation covers two distinct technologies that later diverged underscores the fluid nature of early electronic classification systems.

## Notable For
- **Dual Composition**: Unique for comprising two distinctly different series of hybrid circuits under a single designation.
- **Lineage**: Notable for being the origin of the 447 series of integrated circuits.
- **Dual-Sector Utility**: Distinguished by its application in both civilian telecommunications and specialized avionics.
- **Standardization**: Serves as an example of compliance with the Soviet integrated circuit designation system.

## Body
### Technical Classification
The 247 series is classified as a hybrid integrated circuit. This technology is defined as a miniaturized electronic circuit that combines various semiconductor devices and passive components, all mounted on a common substrate. Unlike monolithic integrated circuits, which are fabricated on a single chip of semiconductor material, hybrid circuits allow for a mix of technologies to be packaged together.

### Development and Manufacturing
The series was developed and manufactured within the Soviet Union. The primary development is attributed to **Avangard**. Manufacturing responsibilities were shared, with **Horizont** listed as the primary manufacturer and **Avangard** as the secondary manufacturer.

### Series Evolution
The 247 series is technically described as containing "two distinctly different series" of hybrid integrated circuits. This indicates that the 247 label was applied to more than one specific internal architecture or design variant. A significant historical note regarding this series is that one of these distinct variants eventually became designated as the **447 series**.

### Applications
The 247 series was designed to meet the rigorous demands of specialized sectors. According to structured property data, the applications include:
1.  **Telecommunications**: Listed as the primary use.
2.  **Avionics**: Listed as the secondary use.