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The transistor acts as a switch for reading and changing the capacitor's state. The capacitor holds the electrons that determine whether the bit is a 0 or 1. Because of all these transistors, a SRAM chip has a much lower capacity that a DRAM chip of comparable size.ĭRAM requires only one transistor and one capacitor to store a bit. To support these states, the circuit requires six transistors, four to store the bit and two to control access to the cell. The circuit delivers two stable states, which are read as 1 or 0. SRAM uses a flip-flop circuit to store each data bit. Much of this difference lies in how they're constructed. Despite this similarity, they differ in important ways. In addition, SRAM is used in toys, appliances, automobiles, industrial equipment and a wide range of IoT devices.īoth SRAM and DRAM are types of nonvolatile memory, which means they lose their data if the power goes out. They might also be embedded in medical products, which can include anything from hearing aids to body area networks that include multiple devices embedded in the body. For example, SRAM chips are often used in cell phones, wearables and other consumer electronics. SRAM can be found in other devices ways as well.

It might also be used in a disk drive as buffer cache, in a peripheral such as a printer or LCD display, or in a network device such as router or switch. For example, it might be part of a RAM digital-to-analog converter ( RAMDAC) on a computer's video or graphic card. However, SRAM is often used for other purposes. Most computers use DRAM instead because it supports greater densities at a lower cost per megabyte ( MB). It is not used for a computer's main memory because of its cost and size. SRAM is commonly used for a computer's cache memory, such as a processor's L2 or 元 cache. However, SRAM is also more expensive than DRAM, and it requires a lot more space. Unlike dynamic RAM ( DRAM), which must be continuously refreshed, SRAM does not have this requirement, resulting in better performance and lower power usage. SRAM (static RAM) is a type of random access memory ( RAM) that retains data bits in its memory as long as power is being supplied. What is SRAM (static random access memory)?