# 1T-SRAM

> Pseudo-static random-access memory technology introduced by MoSys Inc.

**Wikidata**: [Q2813491](https://www.wikidata.org/wiki/Q2813491)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/1T-SRAM)  
**Source**: https://4ort.xyz/entity/1t-sram

## Summary

1T-SRAM is a pseudo-static random-access memory technology developed and introduced by MoSys Inc. As a specialized type of semiconductor memory, it represents a hybrid approach that combines characteristics of both static RAM (SRAM) and dynamic RAM (DRAM), offering an alternative to conventional memory solutions for specific applications.

## Key Facts

- **Full Name:** 1T-SRAM (1 Transistor Static RAM)
- **Type:** Pseudo-static random-access memory technology
- **Manufacturer:** MoSys Inc.
- **Classification:** Product model (instance_of: product model)
- **Subclass of:** Random-access memory (RAM)
- **Wikidata Description:** Pseudo-static random-access memory technology introduced by MoSys Inc.
- **Wikipedia Title:** 1T-SRAM
- **Wikipedia Languages:** Arabic, Catalan, English, Spanish, French, Japanese
- **Sitelink Count:** 6
- **Aliases:** 1T SRAM
- **Freebase ID:** /m/068b_r
- **Microsoft Academic ID:** 2778655182 (discontinued)
- **Image Resource:** https://commons.wikimedia.org/wiki/Special:FilePath/1T-SRAM.JPG

## FAQs

### Q: What is 1T-SRAM?

A: 1T-SRAM is a pseudo-static random-access memory technology created by MoSys Inc. It uses a single transistor architecture to achieve memory storage, distinguishing it from both traditional SRAM (which uses 6 transistors per bit) and DRAM (which uses 1 transistor plus 1 capacitor). This technology offers a balance between the speed of SRAM and the density advantages of DRAM.

### Q: Who developed 1T-SRAM?

A: 1T-SRAM was developed and introduced by MoSys Inc., a semiconductor company specializing in memory technologies. The company positioned this technology as an alternative to conventional SRAM for applications requiring high density with reasonable performance characteristics.

### Q: How does 1T-SRAM differ from conventional SRAM?

A: Unlike traditional SRAM that uses six transistors per memory cell to store each bit, 1T-SRAM utilizes a single transistor approach similar to DRAM. However, unlike DRAM, it does not require constant refresh operations, giving it the "pseudo-static" designation. This allows for higher density compared to conventional SRAM while maintaining some of the performance advantages of static memory.

### Q: What type of memory is 1T-SRAM classified under?

A: 1T-SRAM is classified as a subclass of random-access memory (RAM). It falls under the broader category of computer hardware and volatile storage, meaning it requires power to maintain stored data. As a pseudo-static memory technology, it occupies a unique position between the two primary RAM types: SRAM and DRAM.

### Q: What are the available language versions of the 1T-SRAM Wikipedia article?

A: The 1T-SRAM Wikipedia article is available in six languages: Arabic (ar), Catalan (ca), English (en), Spanish (es), French (fr), and Japanese (ja), with a total sitelink count of 6.

## Why It Matters

1T-SRAM represents an important innovation in memory architecture that addressed specific challenges in semiconductor design during its development period. The technology matters because it demonstrated an alternative approach to the traditional SRAM versus DRAM tradeoff that had long defined memory design decisions.

Traditional SRAM, while offering excellent speed and not requiring refresh operations, suffered from low density due to its use of six transistors per bit. DRAM offered much higher density but required constant refreshing and had slower access times. 1T-SRAM attempted to capture benefits from both approaches—offering higher density than conventional SRAM through its single-transistor architecture while avoiding the refresh requirements of traditional DRAM.

This technology was particularly relevant for applications where memory density was important but where the full density advantages of DRAM were not required, or where the refresh overhead of DRAM was problematic. The development by MoSys Inc. represented an effort to provide semiconductor designers with another option in the memory hierarchy, particularly for applications requiring a middle ground between performance and density.

The existence of 1T-SRAM also illustrates the ongoing innovation in memory technology beyond the primary DRAM and SRAM categories, showing how companies explored various architectural approaches to optimize memory solutions for different computing needs.

## Notable For

- **Single Transistor Architecture:** Uses one transistor per memory cell, significantly different from conventional SRAM's six-transistor design
- **Pseudo-Static Operation:** Combines the no-refresh characteristic of SRAM with the density advantages of a single-transistor cell structure
- **MoSys Innovation:** Represents a key product from MoSys Inc. in their memory technology portfolio
- **Hybrid Classification:** Stands as a unique bridge between SRAM and DRAM technologies
- **Wikipedia Presence:** Documented in six language editions, indicating international recognition
- **Product Model Status:** Officially classified as a product model in knowledge bases

## Body

### Technology Overview

1T-SRAM is a pseudo-static random-access memory technology developed by MoSys Inc. that implements a single-transistor memory cell architecture. This design represents a significant departure from conventional SRAM, which typically uses six transistors (four transistors for the cross-coupled inverters forming a flip-flop, plus two access transistors) to store each bit of data. By reducing the cell to a single transistor, 1T-SRAM achieves higher memory density comparable to DRAM while maintaining certain characteristics of static memory.

The term "pseudo-static" refers to the technology's operational characteristics. Unlike dynamic RAM (DRAM), which requires constant refresh operations (typically every few milliseconds) to maintain stored data due to capacitor leakage, 1T-SRAM does not require these refresh cycles. However, it differs from true static RAM in its underlying cell architecture, hence the "pseudo" designation. This hybrid approach was designed to offer designers an intermediate option between the high-speed, low-density SRAM and the high-density, refresh-dependent DRAM.

### Manufacturer Background

MoSys Inc. developed and introduced 1T-SRAM as part of its memory technology portfolio. The company focused on semiconductor memory solutions and positioned 1T-SRAM as an alternative for applications where conventional SRAM density was insufficient but where the full characteristics of DRAM were not ideal. MoSys operated in the semiconductor memory space during a period of intense innovation in memory technologies, with the industry exploring various approaches to improve performance, density, and power efficiency.

### Classification and Relationships

1T-SRAM occupies a specific position in the memory technology hierarchy. As a subclass of random-access memory, it inherits the fundamental characteristics of RAM: volatile storage that requires power to maintain data, and the ability to access any location directly without sequential reading. The technology connects to the broader RAM ecosystem, which includes two primary types: static random-access memory (SRAM) and dynamic random-access memory (DRAM).

The relationship to SRAM is particularly relevant because 1T-SRAM shares the non-refresh operational characteristic with SRAM, making it pseudo-static rather than truly dynamic. The relationship to DRAM lies in the single-transistor cell architecture, which is fundamentally similar to how DRAM stores data in a capacitor accessed by a single transistor. This dual relationship makes 1T-SRAM a unique bridging technology in the memory landscape.

### Technical Significance

The development of 1T-SRAM reflected ongoing efforts in the semiconductor industry to optimize the memory hierarchy. Computer architects have long sought to balance the tradeoffs between memory speed, density, power consumption, and cost. Traditional SRAM offered the best performance but at high cost and low density (due to the six-transistor cell), making it suitable primarily for cache memory and other high-speed applications. DRAM offered much higher density at lower cost but required refresh operations and had slower access times, making it suitable for main system memory.

1T-SRAM attempted to address a specific niche in this spectrum—applications requiring more density than SRAM could provide but better performance or simpler operation than DRAM. This included applications where the refresh overhead of DRAM was problematic, where power consumption needed to be reduced, or where moderate-density memory was needed at reasonable cost.

### Documentation and References

The technology is documented in multiple knowledge bases and reference sources. The Wikipedia article titled "1T-SRAM" exists in six language editions (Arabic, Catalan, English, Spanish, French, and Japanese), indicating international awareness of the technology. The Wikidata entry provides structured data including the description as "Pseudo-static random-access memory technology introduced by MoSys Inc." and classifies it as a product model with MoSys as the manufacturer.

The freebase identifier /m/068b_r and the now-discontinued Microsoft Academic ID 2778655182 provide additional academic and knowledge graph references. An image file is maintained on Wikimedia Commons, providing visual documentation of the technology.

### Memory Technology Context

The existence of 1T-SRAM reflects the broader evolution of random-access memory technologies. RAM itself evolved from early forms like magnetic-core memory (which dominated from approximately 1955 to 1975) through various semiconductor implementations. The two fundamental semiconductor types—SRAM and DRAM—each spawned numerous generations and standards, including SDR SDRAM, DDR SDRAM (through DDR5), and various specialized variants like LPDDR for mobile devices.

Within this landscape, 1T-SRAM represents an innovative approach that did not fit neatly into the primary categories but offered specific advantages for certain applications. Its pseudo-static nature meant it could operate without the refresh cycles required by DRAM while achieving higher density than conventional SRAM—a combination that had theoretical advantages for particular use cases in embedded systems, networking equipment, and other applications requiring moderate-density memory with simplified controller requirements.

### Summary

1T-SRAM stands as a notable example of memory technology innovation, demonstrating how semiconductor companies explored architectural variations to address specific market needs. Developed by MoSys Inc., this pseudo-static RAM technology offered a unique combination of single-transistor cell density and non-refresh operation, positioning it as an intermediate option between conventional SRAM and DRAM in the memory hierarchy.

## References

1. Freebase Data Dumps. 2013