AS4C4M16S-7TCN SDRAM Memory IC Equivalent & Substitute Parts

Part Overview

The AS4C4M16S-7TCN is a 64Mbit SDRAM memory IC manufactured by Alliance Memory, Inc., featuring 4M x 16 organization with parallel interface in 54-TSOP II packaging. This part operates at 143 MHz clock frequency with 5.4 ns access time and 3V to 3.6V supply voltage range, supporting industrial temperature operation from 0°C to 70°C. The part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and legacy system maintenance.

Key Parameters

Parameter	Value
Memory Size	64Mbit
Memory Organization	4M x 16
Memory Technology	SDRAM
Memory Interface	Parallel
Clock Frequency	143 MHz
Access Time	5.4 ns
Supply Voltage	3V to 3.6V
Operating Temperature	0°C to 70°C
Package Type	54-TSOP II
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the AS4C4M16S-7TCN is determined by strict equivalence in the following electrical and mechanical parameters:

Memory capacity: 64Mbit
Organization: 4M x 16
Technology: SDRAM with parallel interface
Clock frequency: 143 MHz minimum
Access time: 5.4 ns maximum
Supply voltage: 3V to 3.6V
Package: 54-TSOP II form factor
RoHS3 compliance and MSL 3 rating

Substitute parts are grouped into three categories based on product status and operational temperature range: manufacturer-recommended active alternatives, parametric equivalents, and direct/upgrade alternatives from alternative manufacturers.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Organization	Clock Frequency (MHz)	Access Time (ns)	Operating Temperature (°C)	Package	Product Status
AS4C4M16S-7TCN	Alliance Memory	64Mbit	4M x 16	143	5.4	0 to 70	54-TSOP II	Obsolete
AS4C4M16SA-6TAN	Alliance Memory	64Mbit	4M x 16	166	5.4	-40 to 105	54-TSOP II	Active
AS4C4M16SA-6TCN	Alliance Memory	64Mbit	4M x 16	166	5.4	0 to 70	54-TSOP II	Active
AS4C4M16SA-6TIN	Alliance Memory	64Mbit	4M x 16	166	5.4	-40 to 85	54-TSOP II	Active
AS4C4M16SA-7BCN	Alliance Memory	64Mbit	4M x 16	143	5.4	0 to 70	54-TFBGA	Active
AS4C4M16SA-7TCN	Alliance Memory	64Mbit	4M x 16	143	5.4	0 to 70	54-TSOP II	Active
IS42S16400J-7TL-TR	ISSI	64Mbit	4M x 16	143	5.4	0 to 70	54-TSOP II	Active
IS42S16400J-7TLI-TR	ISSI	64Mbit	4M x 16	143	5.4	-40 to 85	54-TSOP II	Active
IS45S16400J-7CTLA2-TR	ISSI	64Mbit	4M x 16	143	5.4	-40 to 105	54-TSOP II	Active
IS45S16400J-7TLA1-TR	ISSI	64Mbit	4M x 16	143	5.4	-40 to 85	54-TSOP II	Active
IS45S16400J-7TLA2-TR	ISSI	64Mbit	4M x 16	143	5.4	-40 to 105	54-TSOP II	Active

Engineering Selection Recommendations

For direct replacement of the obsolete AS4C4M16S-7TCN in 0°C to 70°C operating environments with 54-TSOP II packaging requirement, AS4C4M16SA-7TCN is the parametric equivalent from the original manufacturer, offering identical electrical specifications and active product status.

For applications requiring extended temperature operation, AS4C4M16SA-6TAN supports -40°C to 105°C with automotive-grade qualification and AEC-Q100 certification, though operating frequency increases to 166 MHz. AS4C4M16SA-6TIN provides -40°C to 85°C operation at 166 MHz for industrial applications.

Alternative manufacturer solutions from ISSI provide equivalent 64Mbit SDRAM functionality in 54-TSOP II packaging. IS42S16400J-7TL-TR matches the original temperature range (0°C to 70°C). IS42S16400J-7TLI-TR and IS45S16400J-7TLA1-TR extend operation to -40°C to 85°C. IS45S16400J-7CTLA2-TR and IS45S16400J-7TLA2-TR support the widest temperature range of -40°C to 105°C.

All substitute parts maintain ROHS3 compliance and MSL 3 rating consistent with the original component.

Frequently Asked Questions (FAQ)

Q: Can AS4C4M16SA-7TCN be used as a direct replacement for AS4C4M16S-7TCN?

A: Yes. AS4C4M16SA-7TCN is a parametric equivalent with identical electrical specifications: 64Mbit capacity, 4M x 16 organization, 143 MHz clock frequency, 5.4 ns access time, 3V to 3.6V supply voltage, and 0°C to 70°C operating temperature. Both use 54-TSOP II packaging and maintain ROHS3 compliance and MSL 3 rating.

Q: What is the difference between AS4C4M16SA-6TCN and AS4C4M16SA-6TAN?

A: Both operate at 166 MHz with 5.4 ns access time in 54-TSOP II packaging. AS4C4M16SA-6TCN operates from 0°C to 70°C for industrial applications. AS4C4M16SA-6TAN extends operation to -40°C to 105°C and includes automotive-grade qualification with AEC-Q100 certification.

Q: Can ISSI parts substitute for Alliance Memory parts?

A: Yes, ISSI IS42S16400 and IS45S16400 series parts provide equivalent 64Mbit SDRAM functionality with matching 4M x 16 organization, 143 MHz clock frequency, 5.4 ns access time, and 54-TSOP II packaging. Temperature range and product status vary by specific part number.

Q: Why does AS4C4M16SA-7BCN have a different package designation?

A: AS4C4M16SA-7BCN uses 54-TFBGA (8x8) packaging instead of 54-TSOP II. While electrically equivalent with identical 143 MHz operation and 5.4 ns access time, the different package form factor requires PCB layout redesign and is not a direct pin-compatible replacement.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 3 (168 Hours) rating consistent with the original AS4C4M16S-7TCN component.

Q: What temperature range should I select for extended reliability?

A: For applications requiring operation beyond 0°C to 70°C, select parts with extended temperature ratings. IS45S16400J-7CTLA2-TR and IS45S16400J-7TLA2-TR support -40°C to 105°C operation. AS4C4M16SA-6TAN also provides -40°C to 105°C with automotive qualification.

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