Renesas Electronics 71321LA55PFI8 SRAM Equivalent & Substitute Parts

Part Overview

The Renesas Electronics 71321LA55PFI8 is a 16Kbit dual-port asynchronous SRAM with parallel interface, organized as 2K x 8, packaged in 64-TQFP (14x14mm). This component operates at 55ns access time and write cycle time with supply voltage range of 4.5V to 5.5V. The part is classified as obsolete, making equivalent substitutes necessary for ongoing system support and new design implementations. Identifying compatible alternatives ensures design continuity and supply chain reliability.

Key Parameters

Parameter	Value
Memory Type	Volatile SRAM
Memory Format	Dual Port, Asynchronous
Memory Size	16Kbit
Memory Organization	2K x 8
Memory Interface	Parallel
Access Time	55 ns
Write Cycle Time	55 ns
Supply Voltage	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	64-TQFP (14x14mm)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the 71321LA55PFI8 is determined by strict equivalence across the following critical parameters:

Memory capacity and organization (16Kbit, 2K x 8)
Dual-port asynchronous SRAM technology
Parallel interface architecture
Package type and pinout (64-TQFP, 14x14mm)
Supply voltage compatibility (4.5V ~ 5.5V)
Operating temperature range (-40°C ~ 85°C)

The 71321LA25PFGI8 qualifies as a direct substitute based on identical memory specifications, organization, interface, package, voltage, and temperature ratings. The primary difference is improved access time (25ns versus 55ns), which represents a performance upgrade rather than a compatibility constraint. Faster access time does not compromise backward compatibility in applications designed for the original 55ns specification.

Parameter Comparison

Parameter	71321LA55PFI8 (Main Part)	71321LA25PFGI8 (Substitute)
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation
Memory Type	Volatile SRAM	Volatile SRAM
Memory Format	Dual Port, Asynchronous	Dual Port, Asynchronous
Memory Size	16Kbit	16Kbit
Memory Organization	2K x 8	2K x 8
Memory Interface	Parallel	Parallel
Access Time	55 ns	25 ns
Write Cycle Time	55 ns	25 ns
Supply Voltage	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	64-TQFP (14x14mm)	64-TQFP (14x14mm)
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Compliance	Non-compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

The 71321LA25PFGI8 is the qualified substitute for the obsolete 71321LA55PFI8. Selection is based on the following engineering criteria:

Functional equivalence across all memory specifications and interface requirements
Active product status ensures ongoing availability and supply chain support
ROHS3 compliance of the substitute meets current environmental and regulatory standards, whereas the main part is non-compliant
Identical electrical and thermal operating parameters guarantee direct replacement capability
Improved access and write cycle time (25ns) provides performance margin without introducing compatibility issues
Matching moisture sensitivity level (MSL 3) maintains equivalent handling and storage requirements

Frequently Asked Questions (FAQ)

Q: Can the 71321LA25PFGI8 directly replace the 71321LA55PFI8 in existing designs?

A: Yes. The substitute part maintains identical memory capacity, organization, interface type, package configuration, supply voltage, and operating temperature range. The faster access time is a performance improvement that does not compromise backward compatibility.

Q: What is the significance of the access time difference between 55ns and 25ns?

A: Access time defines the maximum delay from address input to valid data output. The 25ns specification of the substitute is faster than the 55ns requirement of the original part. Systems designed for 55ns operation will function correctly with the faster 25ns part, as timing constraints are satisfied with margin.

Q: Are there packaging differences between these parts?

A: Both parts use identical 64-TQFP (14x14mm) surface-mount packages. The main part is supplied in standard packaging, while the substitute is available in Tape & Reel format. Tape & Reel packaging is standard for high-volume manufacturing and does not affect component functionality or pinout.

Q: What is the impact of RoHS compliance differences?

A: The main part (71321LA55PFI8) is RoHS non-compliant, while the substitute (71321LA25PFGI8) is ROHS3 compliant. For new designs and applications subject to environmental regulations, the compliant substitute is the appropriate selection. For legacy system maintenance, both parts are electrically equivalent.

Q: Are the moisture sensitivity levels identical?

A: Yes. Both parts carry MSL 3 rating with 168-hour floor life. Handling, storage, and reflow procedures are identical for both components.

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