# 1157 series integrated circuits

> Soviet series of voltage regulator integrated circuits

**Wikidata**: [Q116035870](https://www.wikidata.org/wiki/Q116035870)  
**Source**: https://4ort.xyz/entity/1157-series-integrated-circuits

## Summary  
The 1157 series integrated circuits are a Soviet-era series of voltage regulator ICs designed for electronic applications. These circuits were part of a standardized Soviet semiconductor designation system and functioned similarly to Western voltage regulators like the 78xx series.  

## Key Facts  
- **Type**: Voltage regulator integrated circuit series.  
- **Origin**: Developed and manufactured in the Soviet Union.  
- **Classification**: Subclass of both voltage regulators and integrated circuits.  
- **Designation**: Follows the Soviet integrated circuit naming convention.  
- **Packaging**: Included TO-92 packages (e.g., КР1157ЕН1502А).  
- **Functionality**: Provided stable voltage output for low-power applications.  
- **Legacy**: Comparable to Western equivalents like the 7815 (15V regulator).  
- **Documentation**: Available in Soviet-era technical manuals and datasheets.  

## FAQs  
### Q: What was the purpose of the 1157 series ICs?  
A: They were used as voltage regulators to provide stable power supply voltages in electronic circuits, similar to the 78xx series in Western electronics.  

### Q: Are 1157 series ICs still available today?  
A: While no longer in production, some may still be found in surplus or vintage electronics markets, often as equivalents to Western regulators.  

### Q: How did the 1157 series differ from Western voltage regulators?  
A: They followed Soviet design standards but performed comparable functions, with slight variations in specifications and packaging.  

## Why It Matters  
The 1157 series played a critical role in Soviet electronics, providing reliable voltage regulation for industrial, military, and consumer applications. At a time when semiconductor technology was strategically important, these ICs allowed Soviet engineers to build stable power supplies without relying on Western imports. Their design reflected the broader Soviet approach to electronics—functional, standardized, and compatible with domestic manufacturing capabilities. Today, they serve as a historical example of Cold War-era technological development and remain relevant for restoring or studying vintage Soviet equipment.  

## Notable For  
- **Soviet Standardization**: Complied with the USSR's integrated circuit designation system.  
- **TO-92 Packaging**: Used compact, widely compatible transistor-style cases.  
- **Low-Power Regulation**: Optimized for applications requiring modest current draw.  
- **Historical Significance**: Represented Soviet efforts in semiconductor self-sufficiency.  

## Body  
### Technical Overview  
- **Function**: Provided fixed or adjustable DC voltage regulation.  
- **Voltage Options**: Included variants like the КР1157ЕН1502А, a 15V regulator.  

### Design and Packaging  
- **Case Style**: TO-92, a common transistor package for low-power ICs.  
- **Pinout**: Typically three pins (input, ground, output), matching Western counterparts.  

### Historical Context  
- **Era**: Produced during the late Soviet period (exact dates unspecified).  
- **Comparables**: Functional equivalents to the 78xx series (e.g., 7815).  

### Legacy  
- **Documentation**: Preserved in Soviet technical archives and online repositories.  
- **Collectibility**: Sought after by vintage electronics enthusiasts.