Equivalent & Substitute Parts for 71321LA55PFI

Part Overview

The 71321LA55PFI is a 16Kbit dual-port asynchronous SRAM manufactured by Renesas Electronics Corporation in a 64-TQFP surface mount package. This part features a 55 ns access time and parallel memory interface with 2K x 8 organization. The product is classified as obsolete, making identification of compatible alternatives essential for ongoing system support and component procurement.

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 (14x14)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the 71321LA55PFI is determined by strict equivalence across the following parameters:

Memory capacity and organization (16Kbit, 2K x 8)
Dual-port asynchronous SRAM technology
Parallel memory interface
Supply voltage range (4.5V ~ 5.5V)
Operating temperature range (-40°C ~ 85°C)
Package and pinout compatibility (64-TQFP, 14x14)
Base product number (71321LA)

The 71321LA25PFGI qualifies as a direct substitute because it maintains identical memory specifications, voltage requirements, temperature range, and physical packaging while offering improved performance characteristics.

Parameter Comparison

Parameter	71321LA55PFI (Main Part)	71321LA25PFGI (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 (14x14)	64-TQFP (14x14)
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

The 71321LA25PFGI is the qualified substitute for the 71321LA55PFI based on the following factors:

Functional Compatibility: Both parts share identical memory capacity, organization, interface type, and electrical specifications. The 64-TQFP package and pinout are equivalent, enabling direct board-level replacement without layout modifications.

Performance Enhancement: The substitute part provides faster access and write cycle times (25 ns versus 55 ns), representing a performance improvement that is backward-compatible with systems designed for the original part.

Product Status and Compliance: The 71321LA25PFGI is active in production, ensuring long-term availability. It meets ROHS3 compliance requirements, whereas the original part is non-compliant. Both parts maintain identical moisture sensitivity levels and temperature operating ranges.

Supply Voltage and Temperature: Identical supply voltage range (4.5V ~ 5.5V) and operating temperature range (-40°C ~ 85°C) confirm electrical and thermal compatibility.

Frequently Asked Questions (FAQ)

Q: Can the 71321LA25PFGI replace the 71321LA55PFI in existing designs?

A: Yes. The substitute part maintains identical memory specifications, pinout, package dimensions, supply voltage, and operating temperature range. The faster access time is a performance improvement that does not create compatibility issues.

Q: Are there any package or mounting differences?

A: No. Both parts use the 64-TQFP (14x14) surface mount package with identical pinout and mechanical dimensions.

Q: What is the difference in performance between these parts?

A: The 71321LA25PFGI offers faster memory access and write cycle times at 25 ns compared to 55 ns for the 71321LA55PFI. This represents a 2.2x performance improvement while maintaining full functional compatibility.

Q: Does the substitute part have different voltage or temperature requirements?

A: No. Both parts operate across the same supply voltage range (4.5V ~ 5.5V) and temperature range (-40°C ~ 85°C).

Q: What is the RoHS compliance status difference?

A: The original 71321LA55PFI is RoHS non-compliant. The substitute 71321LA25PFGI is ROHS3 compliant, making it suitable for applications with RoHS requirements.

Q: Are the moisture sensitivity levels the same?

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

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