71V3557S80PFG Equivalent & Substitute Parts

Part Overview

The 71V3557S80PFG is a 4.5Mbit Synchronous SRAM (ZBT) memory IC manufactured by Renesas Electronics Corporation, featuring 128K x 36 organization with 8 ns access time in a 100-TQFP (14x14) package. This part is classified as Last Time Buy, indicating discontinued production. Equivalent and substitute parts are necessary to maintain system compatibility and ensure continued availability for new designs or legacy system support.

Key Parameters

Parameter	Value
Memory Size	4.5Mbit
Memory Organization	128K x 36
Memory Type	Volatile SRAM
Technology	SRAM - Synchronous, SDR (ZBT)
Access Time	8 ns
Voltage Supply	3.135V ~ 3.465V
Operating Temperature	0°C ~ 70°C
Package Type	100-TQFP (14x14)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the 71V3557S80PFG is determined by the following critical parameters:

Primary Compatibility Criteria:

Memory Size: 4.5Mbit (fixed requirement)
Memory Organization: 128K x 36 (fixed requirement)
Memory Type: Volatile SRAM (fixed requirement)
Technology: SRAM - Synchronous, SDR (ZBT) or compatible SDR technology
Voltage Supply Range: 3.135V ~ 3.465V (must overlap)
Package Type: 100-TQFP or 100-LQFP (pin-compatible packages)
Mounting Type: Surface Mount (fixed requirement)

Performance Parameters (Substitution Allowed):

Access Time: Equal to or faster than 8 ns
Operating Temperature: Equal to or wider than 0°C ~ 70°C
Clock Frequency: Not a limiting factor for substitution

Substitute parts must maintain identical memory capacity, organization, and electrical interface while meeting or exceeding performance specifications. Package dimensions and pin counts must ensure PCB compatibility.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Organization	Access Time	Clock Frequency	Operating Temp	Package	Product Status
71V3557S80PFG	Renesas	4.5Mbit	128K x 36	8 ns	—	0°C ~ 70°C	100-TQFP (14x14)	Last Time Buy
71V2556S133PFG	IDT	4.5Mbit	128K x 36	4.2 ns	133 MHz	0°C ~ 70°C	100-TQFP (14x14)	Active
71V3557S80PFGI	Renesas	4.5Mbit	128K x 36	8 ns	—	-40°C ~ 85°C	100-TQFP (14x14)	Active
71V546S100PFG	IDT	4.5Mbit	128K x 36	5 ns	100 MHz	0°C ~ 70°C	100-TQFP (14x20)	Active
71V546S133PFGI	Renesas	4.5Mbit	128K x 36	4.2 ns	133 MHz	-40°C ~ 85°C	100-TQFP (14x14)	Active
71V547S100PFGI	IDT	4.5Mbit	128K x 36	10 ns	—	-40°C ~ 85°C	100-TQFP (14x14)	Active
71V547S80PFG	IDT	4.5Mbit	128K x 36	8 ns	—	0°C ~ 70°C	100-TQFP (14x14)	Active
IS61NLF12836A-7.5TQLI	ISSI	4.5Mbit	128K x 36	7.5 ns	117 MHz	-40°C ~ 85°C	100-LQFP (14x20)	Active

Engineering Selection Recommendations

Direct Replacement (Identical Specifications): 71V547S80PFG is the direct equivalent to 71V3557S80PFG, offering identical access time (8 ns), package dimensions (100-TQFP 14x14), and operating temperature range (0°C ~ 70°C). Both parts are manufactured to the same electrical specifications and pin configuration.

Enhanced Performance Substitutes (Faster Access Time): 71V3557S80PFGI, 71V546S133PFGI, and 71V2556S133PFG provide faster access times (4.2 ns) and extended operating temperature ranges (-40°C ~ 85°C). These parts are backward compatible and suitable for applications requiring improved performance margins or wider temperature operation.

Extended Temperature Range Substitutes: 71V3557S80PFGI, 71V546S133PFGI, 71V547S100PFGI, and IS61NLF12836A-7.5TQLI support -40°C ~ 85°C operating temperature, compared to the original 0°C ~ 70°C range. These are appropriate for industrial or automotive applications.

Package Consideration: 71V546S100PFG and IS61NLF12836A-7.5TQLI use 100-TQFP (14x20) or 100-LQFP (14x20) packages, which differ from the original 100-TQFP (14x14). PCB layout verification is required before selection.

Compliance Status: All substitute parts maintain ROHS3 compliance and REACH unaffected status where specified. All parts share identical HTSUS and ECCN classifications.

Frequently Asked Questions (FAQ)

Q: Can I use 71V547S80PFG as a direct replacement for 71V3557S80PFG? A: Yes. Both parts feature identical 8 ns access time, 128K x 36 organization, 100-TQFP (14x14) package, and 0°C ~ 70°C operating temperature. Electrical and mechanical compatibility is complete.

Q: What is the difference between 71V3557S80PFG and 71V3557S80PFGI? A: The primary difference is operating temperature range. The original part operates 0°C ~ 70°C, while the PFGI variant extends to -40°C ~ 85°C. Both maintain 8 ns access time and identical package specifications.

Q: Can faster access time parts substitute for the 71V3557S80PFG? A: Yes. Parts with 4.2 ns or 7.5 ns access times are backward compatible, as they exceed the original 8 ns specification. System timing margins improve with faster parts.

Q: Are there package differences among substitute parts? A: Yes. Most substitutes use 100-TQFP (14x14), matching the original. However, 71V546S100PFG and IS61NLF12836A-7.5TQLI use 100-TQFP or 100-LQFP (14x20) packages. Verify PCB footprint compatibility before selection.

Q: What does Last Time Buy status mean for the original part? A: Last Time Buy indicates the manufacturer has discontinued production. Existing inventory is available, but no future production is planned. Substitute parts with Active status ensure long-term availability.

Q: Do all substitute parts support the same voltage supply range? A: Yes. All listed substitutes operate within the 3.135V ~ 3.465V supply range, ensuring direct electrical compatibility.

Q: Which substitute offers the best performance upgrade? A: 71V546S133PFGI and 71V2556S133PFG both provide 4.2 ns access time (fastest available) and 133 MHz clock frequency, with extended -40°C ~ 85°C temperature range. Selection depends on package requirements and availability.

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