Renesas Electronics 71321LA55PF8 Equivalent & Substitute Parts

Part Overview

The 71321LA55PF8 is a 16Kbit dual-port asynchronous SRAM memory IC in 64-TQFP surface mount packaging. This component features parallel memory interface with 55 ns access time and write cycle time, operating across 4.5V to 5.5V supply voltage range. The part is classified as obsolete, necessitating identification of equivalent alternatives for ongoing system support and new designs requiring compatible memory solutions.

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
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	64-TQFP (14x14)
Mounting Type	Surface Mount
Moisture Sensitivity Level	MSL 3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the 71321LA55PF8 is determined by strict equivalence across the following critical parameters:

Memory capacity and organization must remain constant at 16Kbit with 2K x 8 configuration. The dual-port asynchronous SRAM technology and parallel interface are non-negotiable functional requirements. Package type must be 64-TQFP (14x14) surface mount to ensure PCB compatibility without redesign. Supply voltage range of 4.5V to 5.5V and operating temperature range of 0°C to 70°C must be maintained or exceeded. Access time and write cycle time may be equal to or faster than the original 55 ns specification, as improved timing performance does not compromise backward compatibility.

The 71321LA20PFG8 qualifies as a direct substitute based on identical memory capacity, organization, technology, package, voltage, and temperature specifications. The improved 20 ns access and write cycle time represents a performance upgrade within the same functional family.

Parameter Comparison

Parameter	71321LA55PF8 (Main Part)	71321LA20PFG8 (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	20 ns
Write Cycle Time	55 ns	20 ns
Voltage Supply Range	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C
Package Type	64-TQFP (14x14)	64-TQFP (14x14)
Mounting Type	Surface Mount	Surface Mount
Moisture Sensitivity Level	MSL 3 (168 Hours)	MSL 3 (168 Hours)
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The 71321LA20PFG8 is the qualified substitute for the obsolete 71321LA55PF8. Selection of the substitute part is supported by three primary factors: identical functional specifications across all critical memory and interface parameters, active product status ensuring long-term availability and supply chain continuity, and ROHS3 compliance meeting current environmental and regulatory requirements. The original part's obsolete status and RoHS non-compliance status make transition to the substitute part necessary for new production and ongoing system support.

The performance improvement in access and write cycle time (20 ns versus 55 ns) provides enhanced timing margin without requiring circuit modification, as the substitute operates within the same electrical and mechanical envelope.

Frequently Asked Questions (FAQ)

Q: Can the 71321LA20PFG8 be used as a direct replacement for the 71321LA55PF8 in existing designs?

A: Yes. The substitute part maintains identical memory capacity (16Kbit), organization (2K x 8), package type (64-TQFP 14x14), supply voltage (4.5V to 5.5V), and operating temperature range (0°C to 70°C). The faster access time does not create compatibility issues in systems designed for the original 55 ns specification.

Q: What is the primary reason for substitution?

A: The 71321LA55PF8 is classified as obsolete. The 71321LA20PFG8 is an active product from the same manufacturer with identical functional specifications, ensuring continued availability and supply chain support.

Q: Are there packaging or mounting differences between these parts?

A: No. Both parts use 64-TQFP (14x14) surface mount packaging with identical MSL 3 moisture sensitivity rating. PCB footprints and assembly processes remain unchanged.

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

A: The original 71321LA55PF8 is RoHS non-compliant. The substitute 71321LA20PFG8 is ROHS3 compliant, meeting current environmental regulations for new designs and production.

Q: Does the improved timing specification of the substitute part require circuit redesign?

A: No. The 20 ns access and write cycle time of the substitute part is faster than the original 55 ns specification. Systems designed for the original timing will operate correctly with the faster substitute without modification.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message