Equivalent & Substitute Parts for 71321LA55JI8

Part Overview

The 71321LA55JI8 is a 16Kbit dual-port asynchronous SRAM manufactured by Renesas Electronics Corporation in a 52-PLCC package. This memory IC operates with a 55 ns access time and supports parallel data interfaces across a 2K x 8 memory organization. The part is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing system support and new designs requiring this memory architecture.

Substiute Parts

71321LA55JI8

Renesas Electronics CorporationIn Stock: 81671321LA55JI8 Datasheet

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71321LA25JGI8

Renesas Electronics CorporationIn Stock: 93571321LA25JGI8 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 71321LA55JI8 is determined by strict equivalence across the following parameters:

• Memory capacity and organization (16Kbit, 2K x 8)
• Memory technology (SRAM - Dual Port, Asynchronous)
• Parallel interface architecture
• Package type (52-PLCC with identical physical dimensions)
• Supply voltage range (4.5V ~ 5.5V)
• Operating temperature range (-40°C ~ 85°C)

The 71321LA25JGI8 meets all these criteria. This substitute provides identical memory capacity, organization, interface type, and package specifications. The primary difference is improved access time performance (25 ns versus 55 ns), which represents a performance upgrade rather than a functional limitation.

Parameter Comparison

Engineering Selection Recommendations

The 71321LA25JGI8 is the direct functional equivalent for the obsolete 71321LA55JI8. Selection of this substitute is supported by:

• Identical memory capacity, organization, and interface specifications
• Identical package footprint and mounting characteristics
• Matching supply voltage and operating temperature ranges
• Active product status ensuring continued availability
• ROHS3 compliance, providing regulatory advantage over the non-compliant main part
• Improved access and write cycle times (25 ns), which provide performance headroom in timing-critical applications

The substitute part is electrically and mechanically interchangeable at the board level. No circuit modifications are required for integration.

Frequently Asked Questions (FAQ)

Q: Can the 71321LA25JGI8 directly replace the 71321LA55JI8 in existing designs?

A: Yes. Both parts share identical memory capacity (16Kbit), organization (2K x 8), parallel interface, package type (52-PLCC), supply voltage range (4.5V ~ 5.5V), and operating temperature range (-40°C ~ 85°C). No circuit changes are required.

Q: What is the primary difference between these two parts?

A: The access time and write cycle time differ. The 71321LA25JGI8 operates at 25 ns, while the 71321LA55JI8 operates at 55 ns. This represents a performance improvement in the substitute part.

Q: Are there packaging differences between the main part and substitute?

A: No. Both parts use the 52-PLCC (J-Lead) package with identical physical dimensions (19.13x19.13 mm). The main part is supplied in standard packaging, while the substitute is available in Tape & Reel format.

Q: Does the substitute part meet current regulatory requirements?

A: The 71321LA25JGI8 is ROHS3 compliant, whereas the main part is RoHS non-compliant. This provides regulatory advantage for new designs and systems subject to RoHS requirements.

Q: What is the product status difference?

A: The main part (71321LA55JI8) is classified as obsolete, limiting future availability. The substitute (71321LA25JGI8) is active, ensuring continued supply and support.