Memory

This Product Selection Guide contains information to help select products in the Memory category on DigiKey.com

Memory is a semiconductor device that is used as data storage device on an integrated circuit. These devices are available in several formats CBRAM, DRAM, EEPROM, EERAM, EPROM, Flash, FRAM, NVSRAM, PCM (PRAM), PSRAM, RAM, and SRAM in either Non-Volatile or Volatile. These devices memory sizes range from 64 b to 6 Tb with the interface being I2C, MMC, Parallel, eMMC, Serial, Single Wire, SPI, UFS, Xccela Bus, and 1-Wire.


SelectionCharacteristics

DigiKey Programmable: For verified products, DigiKey can program/flash your compiled code or configuration variables prior to shipping. For unverified products, please inquire with ProgCent.Techs@digikey.com.

Memory Type: The fundamental characteristic of the memory cells.

Memory Format: The specific technology or architecture used in the memory cells.

Technology: The specific underlying technology or architecure used in the emmory cells.

Memory Size: The amount of memory available on the device.

Memory Organization: The specific arrangement and structure of the memory cells.

Memory Interface: The communication protocol used to access or transfer data to and from the device.

Clock Frequency: The frequency at which the memory device operates.

Write Cycle Time - Word, Page: The time it takes to perform a write operation on a specifiic unit of data or a group of data.

Access Time: The time required for valid data to become available after issuance of a read command.

Voltage - Supply: Typically represented by a range, this indicates the low and high voltage limits which one can expect standard operation. Voltages outside this range may damage the device and other system components.

Operating Temperature: Recommended operating temperature, typically given in a range or as a maximum. Exceeding these temperatures may affect performance or damage the device and other system components.

Mounting Type : How the device is attached.

Expanding on Mounting Types

Chassis Mount
Designed to be mounted to a metal chassis.

Chassis Mount, 8" Wire Lead
Attaches to a metal chassis but it includes an 8" wire for connection.

Chassis, Stud Mount
Designed to be mounted to a metal Chassis using an incorporated stud bolt.

Screw Mount
Attaches using screw terminals.

Stud Mount
Has a stud bolt incorporated into one side for attachment.

Flange Mount
Screws or bolts go through wings (flanges) that protrude from the product.

Connector Mount
A mount that incorporates a connector into its method of attachment into the electrical system.

Surface Mount
Have pins or pads that connect to solder pads on the PCB that are then soldered in place forming an electrical and mechanical connection. Number in front of SMD indicates how many pins/pads, for example a 6-SMD module has 6 pins/pads. May not use or even have all the pins/pads for example 24-SMD module, 14 leads: would fit in the space of a 24-SMD module but only has 14 pins/pads. Typically, they are smaller than the through-hole components.

There are three basic types of pins (leads) for surface mount devices.

Lead Types

Gull wing leads: Enable the most pins per inch when compared to J-lead types but they are more fragile. Easy to inspect for defects after soldering.
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J-Leads: Less pins per inch than gull wing leads but they are stronger and less susceptible to breakage.
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Flat Leads:
Must be protectively packaged to prevent damage to leads. Leads must be formed into a gull shape prior to use with a separate piece of equipment. Due to that they are the least popular type of lead.
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Package / Case: Indicates the type of protective case used on an electronic component to allow easy handling, installation, and protection. This selection was determined to be the closest industry standard applicable to the suppliers device packaging. Typically it is best to check the actual dimensions from the datasheet rather than depend on this terminology when designing your circuit.

ProductExamples
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MFR PART # AT21CS01-STUM10-T
DIGI-KEY PART # AT21CS01-STUM10-TTR-ND
MANUFACTURER Microchip Technology
DESCRIPTION EEPROM Memory IC 1Kbit I²C, Single Wire 125 kbps SOT-23-3
DATASHEET Click Here

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MFR PART # M24128-BFMH6TG
DIGI-KEY PART # 497-17565-2-ND
MANUFACTURER STMicroelectronics
DESCRIPTION EEPROM Memory IC 128Kbit I²C 1 MHz 450 ns 5-UFDFPN (1.7x1.4)
DATASHEET Click Here

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MFR PART # AT25SF081B-SSHB-T
DIGI-KEY PART # 1265-AT25SF081B-SSHB-TTR-ND
MANUFACTURER Renesas Design Germany GmbH
DESCRIPTION FLASH - NOR Memory IC 8Mbit SPI - Quad I/O 108 MHz 8-SOIC
DATASHEET Click Here

MediaLinks

Articles
Selecting Embedded Memory for an Application
Expanding Device Memory with HyperBus
Expanding Microcontroller Memory with SPI Flash

Product Training Modules
EEPROM Memory Solutions - ROHM
SDRAM Memory Basic Introduction - Winbond

If you have any general questions on the specifications for selecting Memory, please reply using the button below. If you have questions on specific Memory please post those questions in the Integrated Circuits (ICs) category.