How to read Samsung and Micron memory part numbers (K4B, MT40A, MT41K, MT53E)
- Samsung DRAM markings start with K4; the third letter shows the generation (B = DDR3, A = DDR4).
- Micron markings start with MT; the family code shows the generation (MT41K = DDR3L, MT40A = DDR4, MT53E = LPDDR4/4X).
- Density and width are encoded in the middle, for example 1G16 = 1 Gig x 16 = 16Gb.
- The suffix (speed grade, package, temperature) matters: never substitute without the datasheet.
How are Samsung DRAM part numbers structured?
Take K4B4G0846E-BCNB:
- K4: Samsung DRAM.
- B: DDR3 SDRAM (A is used for DDR4).
- 4G: 4Gb density.
- 08: x8 data width.
- E: die revision.
- -BCNB: package, temperature and speed options. Confirm in the datasheet.
How are Micron DRAM part numbers structured?
| Part | Family | Organisation | Density |
|---|---|---|---|
| MT41K64M16 | DDR3L (1.35V) | 64 Meg x 16 | 1Gb |
| MT40A1G16 | DDR4 | 1 Gig x 16 | 16Gb |
| MT53E1G32D2 | LPDDR4 / LPDDR4X | 1 Gig x 32, 2 dies | 32Gb |
The text after the dash gives speed and options. For example -107 on DDR3L is the 1866 speed grade, -062E on DDR4 is 3200, and -046 on LPDDR4X is 4266.
Why the suffix matters when buying
Two parts that share the same base number can differ in speed, voltage, package or operating temperature. When you request a quote, give the full part number, and ask the supplier to confirm the suffix on the marking and on the document. This is also the first check for spotting relabelled or counterfeit stock.
Check a part number with AURCAL
Look up an exact part number in our catalog or send it through the quote form, and we will confirm availability and condition.
Frequently asked questions
What does K4B mean on a Samsung chip?
K4 is Samsung DRAM and B is the DDR3 generation code.
What does 1G16 mean in MT40A1G16?
It is 1 Gig x 16 organisation, which equals 16Gb.
Where can I find the exact meaning of a suffix?
In the manufacturer's part-numbering section of the datasheet.
Sources and further reading
External pages written by the standards bodies and manufacturers named here. AURCAL is not affiliated with them. Links last checked 1 November 2026.
- Micron: FBGA part marking decoder – Converts the short code printed on a small BGA package into the full Micron part number.
- JEDEC Solid State Technology Association – The standards body for microelectronics, including DRAM and flash memory.