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