Equivalent & Substitute Parts for 71321LA55J8

Part Overview

The 71321LA55J8 is a 16Kbit dual-port asynchronous SRAM manufactured by Renesas Electronics Corporation in a 52-PLCC package. This part is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing system support and new designs. The part operates with a 55 ns access time and write cycle time, suitable for parallel memory interface applications requiring volatile storage.

Substiute Parts

71321LA55J8

Renesas Electronics CorporationIn Stock: 86671321LA55J8 Datasheet

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71321LA20JG8

Renesas Electronics CorporationIn Stock: 101071321LA20JG8 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the 71321LA55J8 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
• Package type and pinout (52-PLCC)
• Supply voltage range (4.5V ~ 5.5V)
• Operating temperature range (0°C ~ 70°C)

The 71321LA20JG8 qualifies as a direct substitute based on these criteria. The primary difference is improved access time (20 ns versus 55 ns), which represents a performance upgrade rather than a functional incompatibility. Both parts share identical memory organization, package configuration, and electrical specifications.

Parameter Comparison

Engineering Selection Recommendations

The 71321LA20JG8 is the appropriate substitute for the obsolete 71321LA55J8. Selection is based on the following factors:

• Functional Equivalence: Both parts maintain identical memory capacity, organization, and interface specifications, ensuring direct pin-compatible replacement.
• Product Status: The 71321LA20JG8 is active and available, whereas the 71321LA55J8 is obsolete with limited future availability.
• Compliance: The 71321LA20JG8 meets ROHS3 compliance requirements, whereas the original part is non-compliant. This is significant for applications subject to regulatory requirements.
• Performance: The 71321LA20JG8 provides faster access and write cycle times (20 ns), which is a performance improvement over the original specification and poses no compatibility risk.
• Inventory: The 71321LA20JG8 is available in higher quantities (945 Pcs) compared to the original part (779 Pcs), supporting production continuity.

Frequently Asked Questions (FAQ)

Q: Can the 71321LA20JG8 be used as a direct replacement for the 71321LA55J8?

A: Yes. Both parts are pin-compatible 52-PLCC packages with identical memory organization (2K x 8), supply voltage (4.5V ~ 5.5V), and operating temperature range (0°C ~ 70°C). The 71321LA20JG8 operates at faster access times, which does not create functional incompatibility.

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

A: The access time and write cycle time differ: the 71321LA55J8 operates at 55 ns, while the 71321LA20JG8 operates at 20 ns. The substitute part is faster and represents a performance upgrade.

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

A: Both parts use the 52-PLCC (J-Lead) package with identical physical dimensions (19.13x19.13 mm). The main difference is packaging format: the original uses standard packaging, while the substitute is supplied in Tape & Reel format.

Q: Does the RoHS compliance difference affect substitution?

A: The 71321LA20JG8 is ROHS3 compliant, whereas the 71321LA55J8 is non-compliant. For applications subject to RoHS regulations, the substitute part is required. For legacy systems without regulatory constraints, both parts are functionally equivalent.

Q: What is the moisture sensitivity level for both parts?

A: Both parts have a Moisture Sensitivity Level (MSL) of 3, requiring storage and handling within 168-hour exposure limits to prevent moisture absorption.