AS4C2M32S-6TCN Equivalent & Substitute Parts

Part Overview

The AS4C2M32S-6TCN is a 64Mbit SDRAM memory IC manufactured by Alliance Memory, Inc., configured as 2M x 32 with parallel interface operation at 166 MHz and 5.5 ns access time. This component is classified as obsolete product status. Due to its obsolete classification, direct replacement with active production equivalents or parametric substitutes is necessary for new designs and ongoing system support.

Key Parameters

Parameter	Value
Memory Size	64Mbit
Memory Organization	2M x 32
Memory Technology	SDRAM
Memory Interface	Parallel
Clock Frequency	166 MHz
Access Time	5.5 ns
Supply Voltage	3V – 3.6V
Operating Temperature	0°C – 70°C
Package Type	86-TFSOP (0.400", 10.16mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict parameter matching across memory capacity, organization, interface type, package configuration, and electrical specifications. The AS4C2M32S-6TCN operates at 166 MHz with 5.5 ns access time within a 0°C to 70°C temperature range. Substitute parts must maintain identical memory size (64Mbit), organization (2M x 32), parallel interface, 86-TFSOP package, and 3V–3.6V supply voltage specifications.

Substitutes are categorized into two groups:

Group 1: Manufacturer Recommended (Active Production Status) Parts with active product status from Alliance Memory and ISSI that match or exceed the electrical performance of the original part while maintaining full parameter compatibility.

Group 2: Parametric Equivalents Parts with identical electrical and mechanical specifications, including clock frequency and access time parameters.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Organization	Clock Frequency (MHz)	Access Time (ns)	Temperature Range (°C)	Product Status	Inventory
AS4C2M32S-6TCN	Alliance Memory	64Mbit	2M x 32	166	5.5	0 – 70	Obsolete	1068 Pcs
AS4C2M32SA-6TIN	Alliance Memory	64Mbit	2M x 32	166	5.5	-40 – 85	Active	1102 Pcs
AS4C2M32SA-7TCN	Alliance Memory	64Mbit	2M x 32	143	5.5	0 – 70	Active	2330 Pcs
AS4C2M32SA-6TCN	Alliance Memory	64Mbit	2M x 32	166	5.5	0 – 70	Active	9400 Pcs
IS42S32200L-5TL	ISSI	64Mbit	2M x 32	200	4.8	0 – 70	Active	1079 Pcs
IS42S32200L-5TL-TR	ISSI	64Mbit	2M x 32	200	4.8	0 – 70	Active	889 Pcs
IS42S32200L-6TL	ISSI	64Mbit	2M x 32	166	5.4	0 – 70	Active	1734 Pcs
IS42S32200L-6TL-TR	ISSI	64Mbit	2M x 32	166	5.4	0 – 70	Last Time Buy	2000 Pcs
IS42S32200L-6TLI	ISSI	64Mbit	2M x 32	166	5.4	-40 – 85	Active	2571 Pcs
IS42S32200L-6TLI-TR	Integrated Silicon Solution	64Mbit	2M x 32	166	5.4	-40 – 85	Last Time Buy	1430 Pcs
IS42S32200L-7TL	ISSI	64Mbit	2M x 32	143	5.4	0 – 70	Active	1110 Pcs

Engineering Selection Recommendations

Primary Substitute: AS4C2M32SA-6TCN This part is the direct parametric equivalent with identical 166 MHz clock frequency and 5.5 ns access time. It maintains the same 0°C to 70°C operating temperature range and is in active production status with the highest inventory availability (9400 Pcs). ROHS3 compliance and MSL 3 rating are maintained. This part is the preferred choice for direct replacement in existing designs.

Extended Temperature Alternative: AS4C2M32SA-6TIN For applications requiring extended temperature operation (-40°C to 85°C), this Alliance Memory part provides identical electrical performance at 166 MHz and 5.5 ns access time while maintaining active product status. Inventory is available at 1102 Pcs.

ISSI Equivalents: IS42S32200L-6TL and IS42S32200L-6TLI These ISSI parts provide parametric equivalence with 166 MHz operation and 5.4 ns access time (within tolerance of the original 5.5 ns specification). IS42S32200L-6TL is available in standard temperature range (0°C to 70°C) with 1734 Pcs inventory. IS42S32200L-6TLI extends to -40°C to 85°C with 2571 Pcs inventory. Both maintain ROHS3 compliance and MSL 3 rating.

Higher Performance Option: IS42S32200L-5TL This ISSI part operates at 200 MHz with 4.8 ns access time, providing performance headroom above the original specification. It is suitable for designs where enhanced speed margin is beneficial. Available in both standard tray packaging (1079 Pcs) and tape & reel format (889 Pcs).

Lower Frequency Alternatives: AS4C2M32SA-7TCN and IS42S32200L-7TL For applications where 143 MHz operation is acceptable, these parts offer active production status. AS4C2M32SA-7TCN provides 2330 Pcs inventory, while IS42S32200L-7TL provides 1110 Pcs. Both maintain 5.4–5.5 ns access time and 0°C to 70°C temperature range.

Frequently Asked Questions (FAQ)

Q: Can AS4C2M32SA-6TCN be used as a direct replacement for AS4C2M32S-6TCN? A: Yes. AS4C2M32SA-6TCN is a parametric equivalent with identical 64Mbit capacity, 2M x 32 organization, 166 MHz clock frequency, 5.5 ns access time, 3V–3.6V supply voltage, and 86-TFSOP package. It is in active production status and is the recommended substitute.

Q: What is the difference between the temperature-rated variants? A: The original AS4C2M32S-6TCN operates from 0°C to 70°C. Extended temperature variants such as AS4C2M32SA-6TIN and IS42S32200L-6TLI operate from -40°C to 85°C. Selection depends on the application's thermal requirements. Extended temperature parts are suitable for industrial and automotive environments.

Q: Are ISSI parts compatible with Alliance Memory designs? A: Yes, provided all electrical and mechanical parameters match. IS42S32200L-6TL and IS42S32200L-6TLI maintain identical memory capacity, organization, parallel interface, package type, and supply voltage as the original part. Access time specifications (5.4 ns vs. 5.5 ns) are within acceptable tolerance for SDRAM applications.

Q: What is the significance of the "-TR" suffix in part numbers? A: The "-TR" suffix indicates tape & reel packaging format, used for automated assembly processes. Parts without this suffix are supplied in tray packaging. Both formats contain identical die and electrical specifications; packaging format selection depends on manufacturing process requirements.

Q: Can I use IS42S32200L-5TL (200 MHz) in place of the 166 MHz original part? A: Yes. The IS42S32200L-5TL operates at higher frequency (200 MHz) with faster access time (4.8 ns), providing performance headroom. It is backward compatible with designs specified for 166 MHz operation. This substitution is suitable when enhanced speed margin is desired.

Q: What does "Last Time Buy" product status mean? A: Last Time Buy indicates the manufacturer has announced end-of-life for that part number. Existing inventory is available for purchase, but no future production is planned. Parts with this status should be evaluated for long-term supply chain planning. IS42S32200L-6TL-TR and IS42S32200L-6TLI-TR carry this designation.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 3 (168 Hours) moisture sensitivity rating, matching the original AS4C2M32S-6TCN specifications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message