71V3557S80BGI Equivalent & Substitute Parts

Part Overview

The 71V3557S80BGI is a 4.5Mbit Synchronous SRAM (ZBT) memory IC manufactured by Renesas Electronics Corporation. This parallel interface memory device operates at 8 ns access time with 3.3V supply voltage and is packaged in a 119-PBGA (14x22) configuration. The part is classified as Last Time Buy, indicating end-of-life status. Identifying equivalent substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications currently utilizing this component.

Key Parameters

Parameter	Value
Memory Type	Volatile SRAM
Technology	SRAM - Synchronous, SDR (ZBT)
Memory Size	4.5Mbit
Memory Organization	128K x 36
Memory Interface	Parallel
Access Time	8 ns
Voltage Supply Range	3.135V ~ 3.465V
Operating Temperature	-40°C ~ 85°C
Package Type	119-PBGA (14x22)
Mounting Type	Surface Mount
Moisture Sensitivity Level	MSL 3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the 71V3557S80BGI is determined by the following critical parameters:

Core Compatibility Requirements:

Memory Type: Volatile SRAM
Technology: SRAM - Synchronous, SDR (ZBT)
Memory Size: 4.5Mbit
Memory Organization: 128K x 36
Memory Interface: Parallel
Package Type: 119-PBGA (14x22)
Voltage Supply Range: 3.135V ~ 3.465V
Operating Temperature Range: -40°C ~ 85°C

Performance Characteristics:

Access Time: Must be equal to or faster than 8 ns
Clock Frequency: May vary based on application requirements

The 71V3556SA166BGI meets all core compatibility requirements while offering improved performance specifications. This substitute maintains identical memory capacity, organization, packaging, and electrical operating parameters while providing faster access time (4.6 ns) and higher clock frequency (166 MHz).

Parameter Comparison

Parameter	71V3557S80BGI (Main Part)	71V3556SA166BGI (Substitute)
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation
Memory Type	Volatile SRAM	Volatile SRAM
Technology	SRAM - Synchronous, SDR (ZBT)	SRAM - Synchronous, SDR (ZBT)
Memory Size	4.5Mbit	4.5Mbit
Memory Organization	128K x 36	128K x 36
Memory Interface	Parallel	Parallel
Access Time	8 ns	4.6 ns
Clock Frequency	Not specified	166 MHz
Voltage Supply Range	3.135V ~ 3.465V	3.135V ~ 3.465V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	119-PBGA (14x22)	119-PBGA (14x22)
Mounting Type	Surface Mount	Surface Mount
Moisture Sensitivity Level	MSL 3 (168 Hours)	MSL 3 (168 Hours)
Product Status	Last Time Buy	Active
RoHS Status	RoHS non-compliant	RoHS non-compliant
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The 71V3556SA166BGI is the manufacturer-recommended substitute for the 71V3557S80BGI. Selection of this substitute is supported by the following factors:

Product Status: The main part 71V3557S80BGI carries Last Time Buy status, indicating discontinued production. The substitute 71V3556SA166BGI maintains Active product status, ensuring ongoing availability and supply chain continuity.

Compliance Alignment: Both parts share identical RoHS and REACH compliance status, maintaining regulatory consistency in applications where these certifications are required.

Electrical and Mechanical Compatibility: The substitute maintains identical voltage supply range, operating temperature range, package configuration, and moisture sensitivity level. These parameters ensure direct compatibility with existing PCB designs and thermal management strategies.

Performance Enhancement: The substitute provides faster access time (4.6 ns versus 8 ns) and specified clock frequency (166 MHz), delivering improved performance characteristics without requiring design modifications.

Frequently Asked Questions (FAQ)

Q: Can the 71V3556SA166BGI be used as a direct replacement for the 71V3557S80BGI?

A: Yes. Both parts are Renesas Electronics Corporation SRAM devices with identical memory capacity (4.5Mbit), organization (128K x 36), parallel interface, packaging (119-PBGA 14x22), voltage supply range (3.135V ~ 3.465V), and operating temperature range (-40°C ~ 85°C). The substitute requires no PCB modifications or design changes.

Q: What are the key differences between these parts?

A: The primary differences are access time (8 ns versus 4.6 ns) and clock frequency specification (not specified versus 166 MHz). The substitute offers faster performance. Both parts maintain identical electrical operating parameters and package specifications.

Q: Are there any compliance considerations when switching to the substitute?

A: Both parts share identical RoHS and REACH compliance status. No compliance changes occur with this substitution.

Q: Why is the main part classified as Last Time Buy?

A: Last Time Buy status indicates the manufacturer has discontinued production of the 71V3557S80BGI. The 71V3556SA166BGI remains in active production, providing long-term supply availability.

Q: Does the faster access time of the substitute affect circuit operation?

A: No. Faster access time is a performance enhancement that maintains backward compatibility. Systems designed for 8 ns access time operate correctly with 4.6 ns components.

Q: Are the moisture sensitivity levels identical?

A: Yes. Both parts carry MSL 3 (168 Hours) rating, requiring identical handling and storage procedures.

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