# 240 series integrated circuits

> hybrid diode-transistor logic ICs

**Wikidata**: [Q130456906](https://www.wikidata.org/wiki/Q130456906)  
**Source**: https://4ort.xyz/entity/240-series-integrated-circuits

## Summary
240 series integrated circuits are a Soviet-era series of hybrid diode–transistor logic (DTL) integrated circuits introduced in 1970. They are hybrid integrated circuits manufactured by Polyaron and Venta and were intended for implementing logic gates and related functions.

## Key Facts
- The 240 series are hybrid diode–transistor logic (DTL) integrated circuits.  
- The series was introduced (inception) in 1970.  
- Country of origin: Soviet Union.  
- Manufacturer(s): Polyaron and Venta.  
- The series is an instance of both an integrated circuit series and the diode–transistor logic family.  
- The 240 series is subclassed as a hybrid integrated circuit (a miniaturized circuit combining different semiconductor devices and passive components on a substrate).  
- The series is documented at a Russian source: http://www.155la3.ru/k240.htm.  
- The 240 series is related to the broader class "integrated circuit series" (model series sharing the same part prefix).  
- The 240 series "uses" 156 series integrated circuits for logic gate functionality (property: uses → 156 series integrated circuits; qualifier: logic gate).  
- Wikimedia Commons category and image: https://commons.wikimedia.org/wiki/Special:FilePath/240ИЛ1Б_Полярон.jpg.

## FAQs
### Q: What are 240 series integrated circuits?
A: The 240 series are hybrid integrated circuits implementing diode–transistor logic (DTL). They are a model series of logic ICs produced in the Soviet Union.

### Q: When were the 240 series introduced?
A: The inception date listed for the 240 series is 1970.

### Q: Who manufactured the 240 series?
A: The listed manufacturers for the 240 series are Polyaron and Venta.

### Q: What logic family do the 240 series belong to?
A: They belong to the diode–transistor logic (DTL) family and are implemented as hybrid integrated circuits.

## Why It Matters
The 240 series represents a specific implementation of diode–transistor logic within the hybrid integrated circuit approach used in the Soviet Union. As hybrid ICs, devices in the 240 series combined different semiconductor devices and passive components on a substrate, a manufacturing approach that enabled compact logic functions where monolithic integration was less common or where mixed-device assemblies were preferred. By providing DTL logic gates in a standardized part series, the 240 family served designers needing reliable, discrete-style logic elements packaged together for system-level use. The series is also part of the historical record of Soviet electronics manufacturing, with documented sources and surviving imagery. For researchers, restorers, and hobbyists working with legacy Soviet equipment, the 240 series is a named, referenced family that links to documentation and visual archives.

## Notable For
- Being a Soviet-era series of hybrid diode–transistor logic ICs introduced in 1970.  
- Combining multiple semiconductor devices and passive components on a single substrate as a hybrid integrated circuit.  
- Explicit association with the 156 series for logic gate use (property indicating interoperability or functional relation).  
- Manufacture by named Soviet producers Polyaron and Venta.  
- Presence in public documentation and image archives (Russian technical page and Wikimedia Commons).

## Body

### Overview
- The 240 series is defined as a series of integrated circuits using diode–transistor logic (DTL).  
- It is categorized as a hybrid integrated circuit series.  
- The hybrid classification indicates assembly of different semiconductor devices and passive components on a substrate.

### Technical characteristics
- Logic family: diode–transistor logic (DTL).  
- Implementation style: hybrid integrated circuit (multi-device substrate assembly).  
- Relationship to other parts: listed as "uses" the 156 series integrated circuits with the qualifier "logic gate", indicating a functional or design linkage to the 156 series for gate implementations.

### History and manufacture
- Inception year: 1970.  
- Country of origin: Soviet Union.  
- Manufacturers: Polyaron and Venta are recorded as producers of the 240 series.  
- Documentation: The series is described at a Russian-language technical page (http://www.155la3.ru/k240.htm).

### Classification and relations
- Instance of: integrated circuit series; diode–transistor logic.  
- Subclass of: hybrid integrated circuit (the parent class defined as a miniaturized electronic circuit combining different semiconductor devices and passive components on a substrate).  
- Related class: integrated circuit series (model series sharing the same part prefix).  
- Uses / relations: linked to the 156 series integrated circuits for logic gate purposes.

### Images and resources
- Representative image (Wikimedia Commons): https://commons.wikimedia.org/wiki/Special:FilePath/240ИЛ1Б_Полярон.jpg.  
- Descriptive resource (Russian): http://www.155la3.ru/k240.htm.

### References
- Described at: http://www.155la3.ru/k240.htm (Russian).  
- Image: Wikimedia Commons file 240ИЛ1Б_Полярон.jpg (Commons category: 240 series integrated circuits).

## References

1. [Source](http://www.155la3.ru/k240.htm)