AS4C4M32D1-5BCN Equivalent & Substitute Parts

Part Overview

The AS4C4M32D1-5BCN is a 128Mbit SDRAM DDR memory IC manufactured by Alliance Memory, Inc., configured as 4M x 32 with parallel interface and 200 MHz clock frequency. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system support and procurement continuity. The part is housed in a 144-LFBGA (12x12) package suitable for surface mount applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	AS4C4M32D1-5BCN
Manufacturer	Alliance Memory, Inc.
Memory Type	Volatile DRAM
Technology	SDRAM - DDR
Memory Size	128Mbit
Memory Organization	4M x 32
Memory Interface	Parallel
Clock Frequency	200 MHz
Access Time	700 ps
Write Cycle Time	12 ns
Voltage Supply	2.3V ~ 2.7V
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	144-LFBGA (12x12)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution for the AS4C4M32D1-5BCN is determined by strict equivalence across the following critical parameters:

Memory capacity: 128Mbit
Memory organization: 4M x 32
Technology: SDRAM - DDR
Clock frequency: 200 MHz
Access time: 700 ps
Write cycle time: 12 ns
Supply voltage range: 2.3V ~ 2.7V
Operating temperature range: 0°C ~ 70°C
Package: 144-LFBGA (12x12)
Mounting type: Surface Mount

The AS4C4M32D1A-5BCN meets all these parameters and qualifies as a direct substitute. The primary distinction is product status: the substitute part is Active, whereas the main part is Obsolete.

Parameter Comparison

Parameter	AS4C4M32D1-5BCN (Main)	AS4C4M32D1A-5BCN (Substitute)
Manufacturer	Alliance Memory, Inc.	Alliance Memory, Inc.
Memory Size	128Mbit	128Mbit
Memory Organization	4M x 32	4M x 32
Technology	SDRAM - DDR	SDRAM - DDR
Clock Frequency	200 MHz	200 MHz
Access Time	700 ps	700 ps
Write Cycle Time	12 ns	12 ns
Voltage Supply	2.3V ~ 2.7V	2.3V ~ 2.7V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C
Package / Case	144-LFBGA (12x12)	144-LFBGA (12x12)
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

The AS4C4M32D1A-5BCN is the direct substitute for the AS4C4M32D1-5BCN. Both parts are manufactured by Alliance Memory, Inc., and maintain identical electrical and mechanical specifications. The substitute part carries Active product status, ensuring continued availability and supply chain support. Both parts maintain ROHS3 compliance and equivalent moisture sensitivity ratings. Selection of the substitute part eliminates obsolescence risk while preserving full functional and physical compatibility.

Frequently Asked Questions (FAQ)

Q: Can AS4C4M32D1A-5BCN be used as a direct replacement for AS4C4M32D1-5BCN?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters, including memory capacity, organization, clock frequency, access time, voltage supply, operating temperature range, and 144-LFBGA package configuration.

Q: What is the primary difference between these two parts?

A: The AS4C4M32D1-5BCN is classified as Obsolete, while the AS4C4M32D1A-5BCN is Active. This distinction affects long-term availability and procurement continuity.

Q: Are there packaging differences between these parts?

A: The main part is specified without packaging designation, while the substitute is supplied in Tray packaging. Both use identical 144-LFBGA (12x12) component packages suitable for surface mount assembly.

Q: Do both parts meet the same compliance standards?

A: Yes. Both parts are ROHS3 compliant, REACH unaffected, and carry identical MSL ratings of 3 (168 Hours).

Q: What are the critical parameters for substitution compatibility?

A: Memory capacity (128Mbit), organization (4M x 32), technology (SDRAM - DDR), clock frequency (200 MHz), access time (700 ps), voltage supply (2.3V ~ 2.7V), operating temperature (0°C ~ 70°C), and package type (144-LFBGA 12x12) must remain constant for functional equivalence.

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