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name: alliancememory description: Alliance Memory MPN encoding patterns, suffix decoding, and handler guidance. Use when working with Alliance Memory SRAM, DRAM, or Flash components.

Alliance Memory Manufacturer Skill

Company Overview

Alliance Memory is a leading supplier of commodity memory devices including SRAM (Static RAM), SDRAM, DDR SDRAM (DDR1/DDR2/DDR3), and NOR Flash. They specialize in providing drop-in replacements for legacy memory devices from other manufacturers.

Key Product Lines:

• AS6C series: Asynchronous SRAM (async SRAM)
• AS7C series: High-speed synchronous SRAM
• AS4C series: SDRAM and DDR SDRAM (DDR1, DDR2, DDR3)
• AS29LV series: NOR Flash memory

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MPN Structure

Alliance Memory MPNs follow this general structure:

[PREFIX][DENSITY][VARIANT]-[SPEED][PACKAGE][TEMP][QUALIFIER]
   |       |        |         |      |       |       |
   |       |        |         |      |       |       +-- N = Lead-free (RoHS)
   |       |        |         |      |       +---------- C/I/A = Temperature grade
   |       |        |         |      +------------------ P/T/B/J/S/V = Package
   |       |        |         +------------------------- Access time in nanoseconds
   |       |        +----------------------------------- A/B = Variant/revision
   |       +-------------------------------------------- Memory density
   +---------------------------------------------------- AS6C/AS7C/AS4C/AS29LV = Series prefix

Example Decoding

AS6C4008-55PCN
|  |   |  ||||
|  |   |  |||+-- N = Lead-free (RoHS compliant)
|  |   |  ||+--- C = Commercial temperature (0 to +70C)
|  |   |  |+---- P = PDIP package
|  |   |  +----- 55 = 55ns access time
|  |   +-------- 4008 = 4Mbit density (512K x 8)
|  +------------ 6C = Async SRAM series
+--------------- AS = Alliance Memory prefix

AS4C256M16D3A-12BCN
|  |     | |||  ||||
|  |     | |||  |||+-- N = Lead-free
|  |     | |||  ||+--- C = Commercial temperature
|  |     | |||  |+---- B = BGA package
|  |     | |||  +----- 12 = 12ns (CL=11 DDR3)
|  |     | ||+-------- A = Revision A
|  |     | |+--------- D3 = DDR3 generation
|  |     | +---------- 16 = 16-bit data bus width
|  |     +------------ M = Mega (x1,000,000)
|  +------------------ 256 = 256 Megabits depth
+---------------------- AS4C = SDRAM/DDR series

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Package Codes

Memory Package Mapping

Code	Package	Description	Typical Pin Count
P	PDIP	Plastic Dual In-line Package	28-40
T	TSOP	Thin Small Outline Package	28-56
B	BGA	Ball Grid Array	54-84
J	PLCC	Plastic Leaded Chip Carrier	32-44
S	SOIC	Small Outline IC	28-32
V	TSSOP	Thin Shrink Small Outline Package	28-44
Z	FBGA	Fine-pitch Ball Grid Array	48-96
W	WSON	Very Very Thin Small Outline No-lead	8-24
Q	QFN	Quad Flat No-lead	24-48

Package Selection by Memory Type

Memory Type	Common Packages
AS6C (Async SRAM)	PDIP, TSOP, SOIC, PLCC
AS7C (High-speed SRAM)	PLCC, TSOP
AS4C SDRAM	TSOP
AS4C DDR1/DDR2	TSOP
AS4C DDR3	BGA, FBGA
AS29LV Flash	TSOP

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Series Reference

AS6C - Asynchronous SRAM

Low-power async SRAM for embedded systems, battery-backed applications.

Part Number	Density	Organization	Typical Speed
AS6C62256	256Kbit	32K x 8	55ns, 70ns
AS6C6264	64Kbit	8K x 8	55ns, 70ns
AS6C1008	1Mbit	128K x 8	45ns, 55ns
AS6C2016	16Kbit	2K x 8	55ns
AS6C4008	4Mbit	512K x 8	45ns, 55ns

AS7C - High-Speed SRAM

Synchronous and high-speed async SRAM for performance applications.

Part Number	Density	Organization	Typical Speed
AS7C256	256Kbit	32K x 8	10ns, 12ns, 15ns
AS7C1024	1Mbit	128K x 8	10ns, 12ns
AS7C4096	4Mbit	512K x 8	12ns

AS4C - SDRAM and DDR SDRAM

Suffix	Type	Description
SA	SDRAM	Synchronous DRAM (PC100/PC133)
D1	DDR1	DDR SDRAM (DDR-266/333/400)
D2	DDR2	DDR2 SDRAM (DDR2-400/533/667)
D3	DDR3	DDR3 SDRAM (DDR3-1066/1333/1600)

Part Number	Density	Organization	Type
AS4C4M16SA	64Mbit	4M x 16	SDRAM
AS4C8M16SA	128Mbit	8M x 16	SDRAM
AS4C16M16SA	256Mbit	16M x 16	SDRAM
AS4C32M16SA	512Mbit	32M x 16	SDRAM
AS4C32M16D1A	512Mbit	32M x 16	DDR1
AS4C64M16D2A	1Gbit	64M x 16	DDR2
AS4C128M16D3A	2Gbit	128M x 16	DDR3
AS4C256M16D3A	4Gbit	256M x 16	DDR3
AS4C512M16D3A	8Gbit	512M x 16	DDR3

AS29LV - NOR Flash

Legacy-compatible NOR Flash memory.

Part Number	Density	Notes
AS29LV160B	16Mbit	Boot block flash
AS29LV320B	32Mbit	Boot block flash
AS29LV640B	64Mbit	Large capacity flash
AS29LV800B	8Mbit	Boot block flash
AS29LV400B	4Mbit	Boot block flash

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Temperature Grades

Code	Grade	Range	Application
C	Commercial	0C to +70C	Consumer/office equipment
I	Industrial	-40C to +85C	Industrial systems
A	Automotive	-40C to +125C	Automotive/harsh environments

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Speed Grades

Speed grade represents the access time in nanoseconds. Lower = faster.

SRAM Speed Grades

Speed (ns)	Series	Notes
10	AS7C	Ultra-high speed
12	AS7C	High-speed
15	AS7C	High-speed
20	AS6C, AS7C	Standard
25	AS6C	Standard
45	AS6C	Standard
55	AS6C	Standard (most common)
70	AS6C	Low-power optimized

DDR Speed Grades

Speed (ns)	Type	DDR Standard
5	DDR1	DDR-400
6	SDRAM	PC133
7	SDRAM	PC133
10	SDRAM	PC100
12	DDR3	DDR3-1600 (CL=11)
15	DDR3	DDR3-1333 (CL=9)
25	DDR2	DDR2-667

Flash Speed Grades

Speed (ns)	Notes
70	Fast access
90	Standard
120	Low-power

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Handler Implementation Notes

Package Code Extraction

// Package code is after the speed grade digits
// AS6C4008-55PCN -> skip "55" (digits), first letter 'P' = PDIP

int hyphenIndex = mpn.indexOf('-');
String suffix = mpn.substring(hyphenIndex + 1);

// Skip speed grade digits
int i = 0;
while (i < suffix.length() && Character.isDigit(suffix.charAt(i))) {
    i++;
}
// suffix.charAt(i) is the package code

Series Extraction

// Extract the series prefix (before density digits)
if (mpn.startsWith("AS29LV")) return "AS29LV";  // Check longest first!
if (mpn.startsWith("AS6C")) return "AS6C";
if (mpn.startsWith("AS7C")) return "AS7C";
if (mpn.startsWith("AS4C")) return "AS4C";

IMPORTANT: Check "AS29LV" before the shorter prefixes - pattern order matters!

Density Extraction

// Different format for different series:
// AS6C/AS7C: numeric density after 4-char prefix
//   AS6C4008 -> "4008"
//   AS6C62256 -> "62256"

// AS4C: depth + "M" + width format
//   AS4C4M16SA -> "4M16" (4M x 16)
//   AS4C256M16D3A -> "256M16" (256M x 16)

// AS29LV: numeric density in Mbit (divide by 10 for actual)
//   AS29LV160B -> "160" (16Mbit)

Replacement Logic

The handler implements isOfficialReplacement() with these rules:

1. Same series required: AS6C cannot replace AS7C
2. Same density required: Different densities are not compatible
3. Faster can replace slower: 45ns can replace 55ns (not vice versa)
4. Wider temp can replace narrower: Industrial can replace Commercial
5. Package is flexible: Different packages are replaceable (design consideration)

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Component Types

The handler supports:

ComponentType	Description
MEMORY	All memory types (SRAM, SDRAM, DDR)
MEMORY_FLASH	AS29LV NOR Flash only

Note: AS29LV matches BOTH MEMORY and MEMORY_FLASH types.

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Cross-Reference with Other Manufacturers

Alliance Memory specializes in drop-in replacements:

Alliance Part	Compatible With	Notes
AS6C1008	Cypress CY7C1019	Pin-compatible async SRAM
AS6C4008	Cypress CY7C1041	Pin-compatible async SRAM
AS6C62256	Cypress CY7C199	Classic 32K x 8 SRAM
AS4C16M16SA	Micron MT48LC16M16	SDRAM replacement
AS29LV160B	Spansion AM29LV160	NOR Flash replacement

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Related Files

• Handler: manufacturers/AllianceMemoryHandler.java
• Tests: handlers/AllianceMemoryHandlerTest.java
• Component types: MEMORY, MEMORY_FLASH
• Similar handlers: MicronHandler, ISSIHandler, WinbondHandler

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Learnings & Edge Cases

• Series prefix order: When matching, always check "AS29LV" (6 chars) before "AS6C" (4 chars) - otherwise AS29LV won't match correctly
• Density format varies by series: AS6C/AS7C use simple numbers (4008), AS4C uses "depth M width" format (256M16)
• DDR generation from suffix: D1=DDR1, D2=DDR2, D3=DDR3, SA=SDRAM
• Flash dual-type matching: AS29LV parts match both MEMORY and MEMORY_FLASH - this is intentional
• Low power variants: Some parts have 'L' in the part number (AS6C4008L) for low-power versions
• Revision letters: A/B after the base number indicates silicon revision (AS7C1024A, AS29LV160B)
• Lead-free indicator: 'N' suffix indicates RoHS-compliant lead-free packaging
• Temperature in suffix position: Temperature grade comes after package code, before lead-free indicator (55PCN = P-package, C-temp, N-lead-free)
• Handler uses Set.of(): Correctly uses immutable Set.of() in getSupportedTypes()
• Case-insensitive matching: Handler converts MPNs to uppercase before pattern matching

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