AS4C8M16S-7TCNTR SDRAM Memory IC Equivalent & Substitute Parts

Part Overview

The AS4C8M16S-7TCNTR is a 128Mbit SDRAM memory IC manufactured by Alliance Memory, Inc., configured as 8M x 16 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, designed for industrial temperature applications (0°C to 70°C). The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Memory Size	128Mbit
Memory Organization	8M 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 (0.400", 10.16mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the AS4C8M16S-7TCNTR is determined by strict alignment of the following critical parameters:

Mandatory Compatibility Parameters:

Memory Size: 128Mbit (exact match required)
Memory Organization: 8M x 16 (exact match required)
Memory Technology: SDRAM (exact match required)
Memory Interface: Parallel (exact match required)
Package Type: 54-TSOP II (exact match required)
Supply Voltage: 3V to 3.6V (exact match required)

Performance Parameters (substitution allowed with equal or superior specifications):

Clock Frequency: 143 MHz or higher
Access Time: 5.4 ns or faster

Environmental Parameters:

Operating Temperature: Must support minimum 0°C to 70°C range
RoHS Compliance: ROHS3 Compliant (required)
MSL Rating: 3 (168 Hours) or better

Substitute parts are grouped into two categories: Alliance Memory AS4C series variants (same manufacturer, optimized performance) and ISSI IS42S/IS45S series (alternative manufacturer, equivalent or superior specifications).

Parameter Comparison

Part Number	Manufacturer	Clock Frequency (MHz)	Access Time (ns)	Operating Temperature (°C)	Product Status	Inventory (Pcs)
AS4C8M16S-7TCNTR	Alliance Memory	143	5.4	0 to 70	Obsolete	2857
AS4C8M16SA-7TCN	Alliance Memory	143	5.4	0 to 70	Active	2200
AS4C8M16SA-6TCN	Alliance Memory	166	5	0 to 70	Active	3250
AS4C8M16SA-6TAN	Alliance Memory	166	5	-40 to 105	Active	3486
AS4C8M16SA-6TIN	Alliance Memory	166	5	-40 to 85	Active	1462
IS42S16800F-7TL-TR	ISSI	143	5.4	0 to 70	Active	2049
IS42S16800F-7TLI-TR	ISSI	143	5.4	-40 to 85	Active	5188
IS42S16800F-6TL-TR	ISSI	166	5.4	0 to 70	Active	930
IS42S16800F-6TLI-TR	ISSI	166	5.4	-40 to 85	Active	2300
IS42S16800F-5TLI-TR	ISSI	200	5	-40 to 85	Active	953
IS45S16800F-6CTLA1-TR	ISSI	166	5.4	-40 to 85	Active	829

Engineering Selection Recommendations

Direct Replacement (Identical Specifications): AS4C8M16SA-7TCN is the primary direct replacement, offering identical electrical and thermal specifications to the AS4C8M16S-7TCNTR with active product status and established supply availability.

Performance-Enhanced Substitutes (Same Temperature Range): AS4C8M16SA-6TCN and IS42S16800F-6TL-TR provide superior clock frequency (166 MHz) and faster access time (5 ns) while maintaining the 0°C to 70°C operating range. These parts are fully compatible and offer performance headroom for legacy system designs.

Extended Temperature Range Alternatives: AS4C8M16SA-6TAN, AS4C8M16SA-6TIN, IS42S16800F-7TLI-TR, IS42S16800F-6TLI-TR, IS42S16800F-5TLI-TR, and IS45S16800F-6CTLA1-TR extend the lower operating temperature to -40°C, suitable for industrial and automotive applications requiring enhanced thermal performance. All maintain ROHS3 compliance and MSL 3 rating.

Highest Performance Option: IS42S16800F-5TLI-TR delivers 200 MHz clock frequency with 5 ns access time and -40°C to 85°C operating range, providing maximum performance margin for demanding applications while maintaining full compatibility.

All substitute parts maintain identical 128Mbit capacity, 8M x 16 organization, parallel interface, 54-TSOP II packaging, and 3V to 3.6V supply voltage specification. Product status is active for all substitutes, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can AS4C8M16SA-6TCN replace AS4C8M16S-7TCNTR in existing designs? A: Yes. AS4C8M16SA-6TCN is fully compatible. It maintains identical memory capacity, organization, interface, packaging, and supply voltage. The higher clock frequency (166 MHz vs. 143 MHz) and faster access time (5 ns vs. 5.4 ns) provide performance enhancement with no compatibility risk.

Q: What is the difference between AS4C8M16SA-6TAN, AS4C8M16SA-6TIN, and AS4C8M16SA-6TCN? A: All three share identical electrical specifications (166 MHz, 5 ns access time). The difference is operating temperature range: AS4C8M16SA-6TAN supports -40°C to 105°C (automotive grade, AEC-Q100 qualified), AS4C8M16SA-6TIN supports -40°C to 85°C, and AS4C8M16SA-6TCN supports 0°C to 70°C. Select based on your application's thermal requirements.

Q: Are ISSI IS42S16800 parts pin-compatible with Alliance Memory AS4C8M16 parts? A: Yes. Both manufacturers' parts use identical 54-TSOP II packaging with matching pinout. All listed ISSI substitutes are electrically and mechanically compatible with the original part.

Q: Which substitute offers the best performance? A: IS42S16800F-5TLI-TR provides the highest performance with 200 MHz clock frequency and 5 ns access time. It also supports extended temperature range (-40°C to 85°C) and maintains full compatibility with the original design.

Q: Can I use a substitute with a different operating temperature range? A: Yes, provided your application's actual operating temperature falls within the substitute's specified range. For example, if your system operates at 0°C to 70°C, any substitute supporting this range or a wider range is acceptable. Extended range parts (e.g., -40°C to 85°C) are suitable for any application within their specification.

Q: Are all substitutes RoHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 3 (168 Hours) rating, matching the original part's environmental specifications.

Q: What is the difference between Tape & Reel (TR) and Tray packaging? A: Tape & Reel packaging is standard for automated assembly lines and high-volume production. Tray packaging is used for manual handling or lower-volume applications. Both formats contain identical components; the difference is in delivery and handling method. Verify your assembly process requirements before selecting packaging type.

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