Micron utilizes a specialized part numbering system that differs between full Marketing Part Numbers (MPN) and abbreviated FBGA Marking Codes
found physically on memory chips. To bridge this gap, Micron provides the FBGA and Component Marking Decoder
tool to convert short codes into complete, searchable part numbers. 1. FBGA Marking Code vs. Full Part Number
Because of physical space constraints on small memory packages, Micron cannot print the entire MPN on the chip. Instead, they use a five-digit alphanumeric code
This code is typically the second five-digit mark on the chip, often found on the middle or bottom row of text. Common Prefixes: : Standard production parts (e.g., D9WFL).
: Often indicates parts used specifically for Crucial brand modules. : Reserved for engineering samples. 2. How to Use the Decoder Tool To identify a specific chip, use the official Micron FBGA Part Marking Decoder Locate the Code: Find the 5-digit string on the physical chip. Enter the code into the "FBGA Code" field on the website. The tool returns the full Marketing Part Number (e.g., MT40A1G8SA-075:E ), which can then be used to find the Product Data Sheet 3. Anatomy of a Micron Part Number A full Micron MPN (like MT40A1G8SA-075:E ) breaks down into specific segments: : Micron Technology. : Product Family (e.g., 40 = DDR4 SDRAM, 41 = DDR3). micron memory part number decoder
: Density and Configuration (e.g., 1Gb capacity with x8 width). : Package Code (FBGA/BGA type). : Speed Grade (Clock rate/MT/s target).
: Operating Temperature (e.g., IT = Industrial, blank = Commercial).
: Die Revision (Designator for specific internal silicon version). 4. Additional Decoder Resources
Micron offers supplemental guides for specific product categories: FBGA and part decoder | Micron Technology Inc.
Decoding Micron Technology memory part numbers can be complex because the format varies significantly between product families (e.g., DRAM vs. NAND Flash vs. Managed NAND). However, the most common decoding requests involve DRAM (DDR4, DDR5) and NAND Flash components. Micron utilizes a specialized part numbering system that
Below is a detailed decoder guide broken down by product family.
A module marked MTA8ATF1G64AZ – the 1G64 means 8GB module (1G x 64 bits). But a discrete chip MT40A1G16 is only 1Gb (128MB). Context matters.
Micron provides a Part Number Decoder Tool on their support site (Micron.com → Support → Part Number Decoder). However, it doesn’t always cover discontinued parts. This guide helps you decode those legacy modules manually.
Micron SSDs use a different logic. Example: MTFDDAK256TDL-1AW1ZABYY
Decode:
MTFD = Micron Flash DriveD = Form factor: D (M.2), A (2.5”), B (BGA SSD)A = Interface: A (SATA), B (PCIe), C (NVMe)K = Capacity code: 256GBTDL = NAND generation (T = TLC, DL = 96L)1AW1 = Firmware / feature setZABYY = Country of assembly and environmental complianceIf you work in IT procurement, system building, or hardware repair, you have likely stared at a string of alphanumeric characters on a RAM stick and wondered what it all means. Micron Technology—parent company of the consumer-facing brand Crucial—is one of the world’s largest manufacturers of DRAM, NAND, and SSD storage. Their part numbering system is complex but incredibly logical.
Decoding a Micron memory part number is not just an academic exercise. It tells you the density, speed, voltage, package type, temperature rating, and environmental compliance of a component. Misreading it could result in buying an incompatible SODIMM for a laptop or using an industrial-grade chip in a consumer device (or vice versa).
This article serves as a complete Micron memory part number decoder—breaking down every segment of the code for DRAM modules, discrete DRAM components, and solid-state drives.
MT40A8G8GB-062E:BMicron part numbers generally consist of roughly 13 to 18 characters broken down into distinct fields. While configurations can vary slightly by product family (e.g., NAND Flash vs. DRAM), the standard format for DRAM Modules follows this sequence:
[Family] [Density][Depth] [Organization] [Package] [Speed] [Feature/Revision] Micron SSD (Solid State Drive) Part Numbers Micron
Let’s break down the most common example: a standard DDR4 UDIMM.