Renesas Electronics 71V321L55PF Equivalent & Substitute Parts

Part Overview

The 71V321L55PF is a 16Kbit dual-port asynchronous SRAM memory IC manufactured by Renesas Electronics Corporation in a 64-TQFP surface mount package. This component features parallel memory interface with 55 ns access time and write cycle time, operating at 3V to 3.6V supply voltage across a 0°C to 70°C temperature range. The part is classified as obsolete, necessitating identification of active equivalent components for new designs and ongoing production requirements.

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	3V to 3.6V
Operating Temperature	0°C to 70°C
Package Type	64-TQFP (14x14)
Mounting Type	Surface Mount
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the 71V321L55PF is determined by strict equivalence across the following critical parameters:

Memory capacity and organization (16Kbit, 2K x 8 configuration)
Dual-port asynchronous SRAM technology
Parallel memory interface
Supply voltage range (3V to 3.6V)
Operating temperature range (0°C to 70°C)
Physical package specification (64-TQFP, 14x14mm)
Surface mount mounting type

The 71V321L25PFG qualifies as a direct substitute based on identical memory specifications, package form factor, and electrical operating parameters. The primary distinction is improved access time and write cycle time performance (25 ns versus 55 ns), which represents a performance upgrade while maintaining full backward compatibility.

Parameter Comparison

Parameter	71V321L55PF (Main Part)	71V321L25PFG (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	3V to 3.6V	3V to 3.6V
Operating Temperature	0°C to 70°C	0°C to 70°C
Package Type	64-TQFP (14x14)	64-TQFP (14x14)
Mounting Type	Surface Mount	Surface Mount
MSL Rating	3 (168 Hours)	3 (168 Hours)
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The 71V321L25PFG is the qualified substitute for the obsolete 71V321L55PF. Selection criteria are based on the following factors:

Product Status: The 71V321L55PF is obsolete, while the 71V321L25PFG maintains active production status, ensuring long-term availability and supply chain continuity.

Compliance: The 71V321L25PFG achieves ROHS3 compliance, whereas the original part is RoHS non-compliant. This distinction is significant for applications subject to environmental and regulatory requirements.

Functional Equivalence: Both parts share identical memory capacity, organization, interface type, voltage specifications, and temperature operating range. The 64-TQFP package footprint is identical, enabling direct PCB-level substitution without layout modification.

Performance Enhancement: The 71V321L25PFG provides faster access and write cycle times (25 ns) compared to the original specification (55 ns). This performance improvement is backward compatible and does not introduce timing conflicts in systems designed for the slower original part.

Frequently Asked Questions (FAQ)

Q: Can the 71V321L25PFG be used as a direct replacement for the 71V321L55PF?

A: Yes. Both parts are manufactured by Renesas Electronics Corporation with identical memory capacity (16Kbit), organization (2K x 8), interface type (parallel dual-port asynchronous SRAM), supply voltage (3V to 3.6V), operating temperature range (0°C to 70°C), and package specification (64-TQFP, 14x14mm). The substitute part offers improved timing performance and is pin-compatible.

Q: What is the primary reason for substitution?

A: The 71V321L55PF is classified as obsolete. The 71V321L25PFG is the active equivalent from the same manufacturer, ensuring continued availability and supply chain support.

Q: Are there differences in compliance or certification?

A: Yes. The 71V321L25PFG is ROHS3 compliant, while the original 71V321L55PF is RoHS non-compliant. Both parts maintain identical MSL ratings (3, 168 Hours) and REACH unaffected status.

Q: Will the faster access time of the substitute part cause compatibility issues?

A: No. The 71V321L25PFG provides faster access and write cycle times (25 ns versus 55 ns). Faster timing is backward compatible with systems designed for the original 55 ns specification and does not introduce timing violations.

Q: Is PCB redesign required for substitution?

A: No. Both parts use the identical 64-TQFP (14x14mm) surface mount package with the same pin configuration. Direct PCB-level substitution is possible without layout modification.

Q: What is the packaging difference between the main part and substitute?

A: The 71V321L55PF is supplied in standard packaging, while the 71V321L25PFG is supplied in Tray packaging. Both maintain identical MSL ratings and handling requirements.

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