If you see -40 anywhere in the suffix, that usually indicates -40°C operating range. Standard parts will not have that. For embedded systems, never substitute a commercial part for an industrial one.
| What you see | What it means |
|--------------|----------------|
| MT40A | DDR4 component |
| MT53E | LPDDR4 component |
| MT60B | CXL memory |
| -062E | DDR4-3200 |
| -083 | DDR4-2400 |
| IT | Industrial temp |
| AT | Automotive |
| :B | Green/Lead-free |
| Field | Code | Meaning | |-------|------|---------| | Base | MT40A | DDR4 SDRAM (40A = DDR4, 40B = DDR4 with different features) | | Density | 512M | 512 Megabits (total per chip). Multiply by organization to get device density. | | Organization | 16 | x16 (data width in bits) | | Package | JY | J = 78-ball BGA, Y = Pb-free, Halogen-free | | Speed Grade | -083E | 083 = 8-8-8 (DDR4-2400), E = DRAM revision | | Revision | :B | B-die revision | micron memory part number decoder
Micron’s part numbering system is logical, but it’s dense. Once you memorize the prefix (MT40A = DDR4, MT53E = LPDDR4) and the speed codes (-062E = 3200), you’ll read these like a native.
Pro move: Bookmark Micron’s official Part Marking Decoder (free, no login required). Enter your string, and it spits out density, speed, voltage, and a direct datasheet link. If you see -40 anywhere in the suffix,
Have a mystery part number? Drop it in the comments—let’s decode it together.
Further Reading:
This tells you how many data pins (DQ) the chip has.
Why this matters: A x16 chip is wider and faster per access than a x4, but x4 chips are better for rank spacing on servers. Micron’s part numbering system is logical, but it’s
| Code | Meaning | |-------|---------| | MT29F | Micron NAND Flash | | 512G | Density (512 Gigabits) | | 08 | Width (x8) | | E | CE (chip enable) count/configuration | | B | Voltage (B = 3.3V VCC, 1.8V VCCQ) | | H | Package (H = 63-ball BGA) | | BB | Grade/Temp (BB = Commercial, -40°C to +85°C) |
You may see trailing codes like AIT, B, or M.