Renesas Electronics 71V321S55PF Equivalent & Substitute Parts

Part Overview

The 71V321S55PF is a 16Kbit dual-port asynchronous SRAM manufactured by Renesas Electronics Corporation in a 64-TQFP surface mount package. This memory IC operates at 3V to 3.6V supply voltage with a 55 ns access time and write cycle time. The device is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. The part is RoHS non-compliant and carries an MSL rating of 3 (168 hours).

Substiute Parts

71V321S55PF

Renesas Electronics CorporationIn Stock: 104971V321S55PF Datasheet

Current PartRFQ

71V321L25PFG

Renesas Electronics CorporationIn Stock: 104071V321L25PFG Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 71V321S55PF is determined by the following critical parameters that must remain constant or be compatible:

• Memory capacity: 16Kbit (2K x 8 organization)
• Memory type: Dual-port asynchronous SRAM
• Interface: Parallel
• Supply voltage: 3V to 3.6V
• Package: 64-TQFP (14x14)
• Mounting: Surface mount

The 71V321L25PFG qualifies as a direct substitute because it maintains identical memory capacity, organization, interface type, supply voltage range, and physical package specifications. The primary difference is improved access time (25 ns versus 55 ns), which represents a performance upgrade rather than a compatibility issue. Faster access times are backward compatible with designs requiring the original 55 ns specification.

Parameter Comparison

Engineering Selection Recommendations

The 71V321L25PFG is the qualified substitute for the obsolete 71V321S55PF. Selection is based on the following engineering criteria:

• Functional equivalence: Both parts maintain identical memory capacity, organization, interface, and electrical specifications
• Product status: The substitute is active production, ensuring long-term availability and supply chain continuity
• Compliance improvement: The substitute achieves ROHS3 compliance, addressing regulatory requirements that the original part does not meet
• Performance upgrade: The 25 ns access and write cycle times exceed the original 55 ns specification, providing improved performance margins without design modification
• Package compatibility: Identical 64-TQFP (14x14) package enables direct PCB footprint compatibility

Frequently Asked Questions (FAQ)

Q: Can the 71V321L25PFG replace the 71V321S55PF in existing designs?

A: Yes. The substitute maintains identical memory capacity (16Kbit, 2K x 8), dual-port asynchronous architecture, parallel interface, supply voltage range (3V to 3.6V), and 64-TQFP package. The faster access time (25 ns) is a performance upgrade and does not create compatibility issues.

Q: What is the primary reason for substitution?

A: The 71V321S55PF is classified as obsolete. The 71V321L25PFG is an active production part from the same manufacturer, ensuring availability and supply chain support.

Q: Are there differences in compliance or environmental ratings?

A: Yes. The 71V321L25PFG is ROHS3 compliant, while the original part is RoHS non-compliant. Both parts carry identical MSL ratings of 3 (168 hours) and operate across the same temperature range (0°C to 70°C).

Q: Does the package remain the same?

A: Yes. Both parts use the 64-TQFP (14x14) surface mount package with identical pinout and footprint specifications.

Q: What is the impact of the faster access time?

A: The 25 ns access time of the substitute is faster than the original 55 ns specification. This represents a performance improvement and does not introduce timing violations in designs specified for the original part.