Micron DRAM part numbers (e.g., MT40A1G8SA-075:E ) follow a specific hierarchical nomenclature: Prefix/Code Manufacturer Prefix Micron Technology Product Family Identifies the technology generation 40 = DDR4; 41 = DDR3; 60 = DDR5 Voltage Operating voltage of the die A = 1.2V; K = 1.35V; L = 1.2V Density/Width Memory capacity and bus width 1G8 = 1Gb depth x 8-bit width; 256M16 = 256Mb x 16-bit Speed Grade Performance rating -075 = 2666 MT/s; -062E = 3200 MT/s Die Revision Post-colon letter indicating the silicon "step"
Product Family (e.g., 42 = Mobile LPDDR2, 40 = DDR4, 41 = DDR3)
Match that long number against Micron's latest data sheet to see the exact speed and size. The printed on your chip
: Use the FBGA Parts Decoder to convert the 5-digit code on a chip (e.g., D9WFL) into a full part number. micron memory part number decoder
When you encounter an unknown Micron chip on a circuit board, use this step-by-step process to find its technical identity:
“1G16” splits into two parts: density and width. “1G” means 1 gigabit (Gb) of total memory. However, DRAM chips are often organized as “1G x 16,” where “16” indicates the device width in bits (DQ pins). A “16” yields a 16-bit-wide interface. Other common widths: 4, 8, or 32. Multiplying density by width confirms total capacity: 1Gb × 16 = 16Gb per chip? Wait—caution: In Micron’s notation, “1G16” actually means a 16-bit-wide device with a total density of 16 gigabits (because 1G refers to the number of words, and 16 bits per word). More precisely, it is 1G words × 16 bits = 16 Gb. For a designer building a 64-bit DIMM, four such chips would be needed.
For a Micron NAND Flash part number like , the structure is different and tends to be more directly descriptive: Micron DRAM part numbers (e
: Used in DDR5 to denote specific MT/s ratings (e.g., DDR5-4800). 8. Die Revision (:E)
Micron uses two distinct systems for identifying its memory products: for full documentation and FBGA Codes (often called "D9 codes") for physical markings on small components. 1. Online Decoder Tools
: Standard DDR4 / DDR5 voltage (e.g., 1.2V for DDR4, 1.1V for DDR5). L : Low voltage variants (e.g., 1.35V for DDR3L). 4. Density/Capacity (1G) “1G” means 1 gigabit (Gb) of total memory
Here’s a helpful guide to decoding (for DRAM, NAND, and DDR modules). Micron (which includes the Crucial brand) uses a structured numbering system. Once you understand the key fields, you can identify density, speed, generation, package, and more.
: Ensure you are reading the printed part number on the chip surface, not the tracking lot code or date code (which are usually shorter and change per batch).
: Often found at the end of a part number (e.g., MT...-0SIT TR ), this simply indicates "Tape and Reel" packaging for shipping, as noted on the DigiKey TechForum .
