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

Density Codes

SDRAM (M12L) and DDR (M14D)

SPI Flash (F25L)

Parallel Flash (F49L)

Package Codes

Speed Grades

SDRAM/DDR

Flash

Product Families

M12L Series - SDRAM

M14D Series - DDR SDRAM

F25L Series - SPI Flash

F49L Series - Parallel Flash

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

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

SPI Flash Equivalents

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

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