AS4C2M32SA-7TCN Equivalent & Substitute Parts

Part Overview

The AS4C2M32SA-7TCN is a 64Mbit SDRAM memory IC manufactured by Alliance Memory, Inc., configured as 2M x 32 with parallel interface architecture. This component operates at 143 MHz clock frequency with 5.5 ns access time, designed for surface mount applications in the 86-TSOP II package. The part maintains Active product status and is ROHS3 compliant, making it suitable for current production environments. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity.

Key Parameters

Parameter	Value
Memory Size	64Mbit
Memory Organization	2M x 32
Memory Technology	SDRAM
Memory Interface	Parallel
Clock Frequency	143 MHz
Access Time	5.5 ns
Supply Voltage	3V ~ 3.6V
Operating Temperature	0°C ~ 70°C
Package Type	86-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 AS4C2M32SA-7TCN is determined by strict alignment across the following critical parameters:

Core Electrical Parameters: Memory capacity (64Mbit), organization (2M x 32), technology (SDRAM), and interface type (Parallel) must be identical. Supply voltage range (3V ~ 3.6V) and operating temperature range (0°C ~ 70°C) must match or exceed the main part specifications.

Timing Parameters: Clock frequency and access time define performance boundaries. Substitute parts operating at equal or higher clock frequencies with equal or lower access times maintain functional compatibility.

Physical Parameters: Package type (86-TSOP II) and mounting method (Surface Mount) must be identical to ensure PCB compatibility without redesign.

Compliance Parameters: RoHS3 compliance and MSL rating (3, 168 Hours) must be maintained for manufacturing and environmental requirements.

The identified substitutes meet these criteria and are listed below.

Parameter Comparison

Parameter	AS4C2M32SA-7TCN (Main)	AS4C2M32SA-6TCN (Substitute)	IS42S32200L-7TL (Substitute)
Manufacturer	Alliance Memory, Inc.	Alliance Memory, Inc.	ISSI, Integrated Silicon Solution Inc
Memory Size	64Mbit	64Mbit	64Mbit
Memory Organization	2M x 32	2M x 32	2M x 32
Memory Technology	SDRAM	SDRAM	SDRAM
Memory Interface	Parallel	Parallel	Parallel
Clock Frequency	143 MHz	166 MHz	143 MHz
Access Time	5.5 ns	5.5 ns	5.4 ns
Write Cycle Time	2 ns	2 ns	Not specified
Supply Voltage	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Package Type	86-TSOP II	86-TSOP II	86-TSOP II
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)
Product Status	Active	Active	Active

Engineering Selection Recommendations

AS4C2M32SA-6TCN (Alliance Memory, Inc.): This substitute operates at 166 MHz clock frequency, exceeding the main part's 143 MHz specification while maintaining identical access time (5.5 ns), supply voltage range, and package configuration. Both parts share the same base product number (AS4C2M32) and manufacturer, ensuring design continuity. ROHS3 compliance and MSL rating are identical. Higher inventory availability (9400 Pcs) supports procurement requirements.

IS42S32200L-7TL (ISSI, Integrated Silicon Solution Inc): This substitute matches the main part's 143 MHz clock frequency and provides superior access time (5.4 ns versus 5.5 ns). Electrical specifications, package type, and compliance certifications are equivalent. Different manufacturer designation (ECCN: EAR99 versus 3A991B2A) reflects regulatory classification differences. Lower inventory availability (1110 Pcs) may impact lead time considerations.

Both substitutes maintain full functional compatibility with the AS4C2M32SA-7TCN within the specified electrical, thermal, and mechanical parameters.

Frequently Asked Questions (FAQ)

Q: Can AS4C2M32SA-6TCN replace AS4C2M32SA-7TCN directly on the PCB?

A: Yes. Both parts use identical 86-TSOP II packaging, pin configuration, and electrical interface. The higher clock frequency (166 MHz) of the substitute provides performance headroom while maintaining backward compatibility with 143 MHz system designs.

Q: What is the difference between the two substitute parts?

A: AS4C2M32SA-6TCN is manufactured by Alliance Memory with 166 MHz operation. IS42S32200L-7TL is manufactured by ISSI with 143 MHz operation and 5.4 ns access time. Both meet the main part's functional requirements; selection depends on manufacturer preference and inventory availability.

Q: Are there any thermal or voltage differences between these parts?

A: No. All three parts operate within identical supply voltage range (3V ~ 3.6V) and temperature range (0°C ~ 70°C). Thermal characteristics and power dissipation are equivalent across the specified operating conditions.

Q: Do these substitutes require any PCB layout modifications?

A: No. Identical package type (86-TSOP II), pin count, and mounting method eliminate the need for PCB redesign or layout changes.

Q: Are all parts RoHS3 compliant?

A: Yes. AS4C2M32SA-7TCN, AS4C2M32SA-6TCN, and IS42S32200L-7TL are all ROHS3 compliant with MSL rating 3 (168 Hours), meeting current environmental and manufacturing standards.

Q: Which substitute should be selected for new designs?

A: Selection is based on manufacturer preference, inventory availability, and supply chain strategy. AS4C2M32SA-6TCN offers higher clock frequency from the same manufacturer. IS42S32200L-7TL provides an alternative source from ISSI with equivalent performance. Both are Active products suitable for production use.

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