ESMT (Elite Semiconductor Memory Technology) Manufacturer Skill

MPN Structure

ESMT MPNs follow this general structure:

[PREFIX][DENSITY][CONFIG][VERSION]-[SPEED][PACKAGE]
   |       |        |       |        |        |
   |       |        |       |        |        +-- Package code (TG, BG, etc.)
   |       |        |       |        +-- Speed grade (6, 5, 2.5, 100, 70)
   |       |        |       +-- Version letter (A, B, etc.)
   |       |        +-- Memory configuration (bus width, banks)
   |       +-- Density in Mbit
   +-- Series prefix (M12L, M14D, F25L, F49L)

Example Decoding

M12L128168A-6TG
|  |   |  ||  ||
|  |   |  ||  |+-- TG = TSOP-II package
|  |   |  ||  +-- 6 = 6ns speed grade
|  |   |  |+-- A = version/revision
|  |   |  +-- 8 = 8 banks
|  |   +-- 16 = 16-bit data bus
|  +-- 128 = 128 Mbit density
+-- M12L = SDRAM series

F25L016A-100PAIG
|  |  ||    | ||
|  |  ||    | |+-- IG = Industrial grade
|  |  ||    | +-- PA = SOP package
|  |  ||    +-- 100 = 100MHz speed
|  |  |+-- A = version
|  |  +-- 016 = 16 Mbit
|  +-- 25L = SPI Flash series
+-- F = Flash prefix

---

Series Prefixes

Prefix	Memory Type	Description
M12L	SDRAM	Synchronous DRAM
M14D	DDR SDRAM	DDR1 SDRAM
F25L	SPI Flash	Serial SPI NOR Flash
F49L	Parallel Flash	Parallel NOR Flash

---

Density Codes

SDRAM (M12L) and DDR (M14D)

Code	Density	Notes
16	16 Mbit
32	32 Mbit
64	64 Mbit
128	128 Mbit
256	256 Mbit	DDR only
512	512 Mbit	DDR only

SPI Flash (F25L)

Code	Density	Notes
004	4 Mbit	Leading zeros
008	8 Mbit	Leading zeros
016	16 Mbit	Leading zeros
032	32 Mbit	Leading zeros
064	64 Mbit	Leading zeros
128	128 Mbit

Parallel Flash (F49L)

Code	Density	Notes
160	16 Mbit	Scaled encoding (160 = 16Mb)
320	32 Mbit	Scaled encoding
640	64 Mbit	Scaled encoding

---

Package Codes

Code	Package	Description
A	TSOP	Thin Small Outline Package
B	BGA	Ball Grid Array
TG	TSOP-II	TSOP Type II
WG	WBGA	Window BGA
BG	BGA	Ball Grid Array
PA	SOP	Small Outline Package
PAIG	SOP	SOP with Industrial Grade
PG	SOP-8	8-pin SOP

---

Speed Grades

SDRAM/DDR

Code	Speed	Access Time
5	200MHz	5ns
6	166MHz	6ns
7	143MHz	7ns
2.5	400MHz	2.5ns (DDR)

Flash

Code	Speed	Notes
70	70ns	Parallel Flash
100	100MHz	SPI Flash
104	104MHz	High-speed SPI

---

Product Families

M12L Series - SDRAM

Part Number	Density	Configuration	Speed
M12L128168A-6TG	128 Mbit	8M x 16 x 8 banks	166MHz
M12L64164A-5TG	64 Mbit	4M x 16 x 4 banks	200MHz
M12L32164A-6TG	32 Mbit	2M x 16 x 4 banks	166MHz

M14D Series - DDR SDRAM

Part Number	Density	Configuration	Speed
M14D5121632A-2.5BG	512 Mbit	32M x 16 x 2	400MHz
M14D2561616A-2.5BG	256 Mbit	16M x 16 x 1	400MHz
M14D1281616A-2.5BG	128 Mbit	8M x 16 x 1	400MHz

F25L Series - SPI Flash

Part Number	Density	Interface	Speed
F25L004A-100PAIG	4 Mbit	SPI	100MHz
F25L008A-100PAIG	8 Mbit	SPI	100MHz
F25L016A-100PAIG	16 Mbit	SPI	100MHz

F49L Series - Parallel Flash

Part Number	Density	Interface	Speed
F49L160UA-70TG	16 Mbit	Parallel	70ns
F49L320UA-70TG	32 Mbit	Parallel	70ns

---

Configuration Encoding (SDRAM/DDR)

The configuration digits after the density encode:

M12L128168A
       |||
       ||+-- Banks (4 or 8)
       |+-- Data bus width (16-bit = 16)
       +-- First digit varies

Config Code	Meaning
168	16-bit bus, 8 banks
164	16-bit bus, 4 banks
1616	16-bit bus, 16Mbit config

---

Handler Implementation Notes

Pattern Matching

// SDRAM - M12L series
"^M12L\\d+.*"

// DDR SDRAM - M14D series
"^M14D\\d+.*"

// SPI Flash - F25L series (also MEMORY_FLASH type)
"^F25L\\d+.*"

// Parallel Flash - F49L series (also MEMORY_FLASH type)
"^F49L\\d+.*"

Package Code Extraction

// Handle hyphenated MPNs - get part after last hyphen
int lastHyphen = upperMpn.lastIndexOf('-');
if (lastHyphen > 0) {
    String suffix = upperMpn.substring(lastHyphen + 1);
    // Strip leading speed grade digits/dots
    String pkgCode = suffix.replaceAll("^[0-9.]+", "");
    // Check PACKAGE_CODES map
}

Density Extraction Complexities

// SPI Flash uses leading zeros: 004, 008, 016
// Parallel Flash uses scaled encoding: 160=16Mbit

// F25L004A -> "4" (strip leading zeros)
// F49L160UA -> "16" (scale down by 10)

---

Cross-References

SDRAM Equivalents

ESMT	Samsung	Micron	ISSI
M12L128168A	K4S641632N	MT48LC8M16	IS42S16800
M12L64164A	K4S281632I	MT48LC4M16	IS42S16400

SPI Flash Equivalents

ESMT	Winbond	Macronix	SST
F25L016A	W25Q16	MX25L1606E	SST25VF016B
F25L008A	W25Q80	MX25L8006E	SST25VF080B

---

Related Files

• Handler:

  manufacturers/ESMTHandler.java

• Component types:

  MEMORY

  ,

  MEMORY_FLASH

  ,

  IC

---

Learnings & Edge Cases

• Leading zeros in F25L: SPI Flash density codes have leading zeros (004, 008, 016)
• Scaled encoding in F49L: Parallel Flash uses 160=16Mbit, 320=32Mbit encoding
• Configuration encoding: SDRAM part numbers encode bus width and bank count
• Speed grade in suffix: Speed appears before package code after hyphen (e.g., -6TG = 6ns + TSOP-II)
• Industrial grade suffix: PAIG = SOP package with Industrial Grade indicator
• Version letters: A, B, C indicate silicon revisions, not always form/fit/function compatible

<!-- Add new learnings above this line -->