Equivalent & Substitute Parts for 7143LA55J

Part Overview

The 7143LA55J is a 32Kbit dual-port asynchronous SRAM manufactured by Renesas Electronics Corporation in a 68-PLCC surface mount package. This memory IC operates with a 55 ns access time and write cycle time, designed for parallel memory interface applications requiring volatile storage. The part is classified as obsolete, making identification of compatible substitutes necessary for ongoing system support and component procurement.

Substiute Parts

7143LA55J

Renesas Electronics CorporationIn Stock: 12477143LA55J Datasheet

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7143LA20JG

Renesas Electronics CorporationIn Stock: 13487143LA20JG Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 7143LA55J is determined by strict equivalence in the following parameters:

• Memory type, format, and organization (Dual Port Asynchronous SRAM, 32Kbit, 2K x 16)
• Memory interface (Parallel)
• Voltage supply range (4.5V ~ 5.5V)
• Operating temperature range (0°C ~ 70°C)
• Package and mounting specifications (68-PLCC, Surface Mount)
• Moisture sensitivity level (MSL 3)

The 7143LA20JG qualifies as a direct substitute based on these parameters. While it features improved access time and write cycle time specifications (20 ns versus 55 ns), this represents a performance enhancement rather than a deviation from compatibility requirements. Both parts share identical memory capacity, organization, interface, electrical ratings, and physical packaging.

Parameter Comparison

Engineering Selection Recommendations

The 7143LA20JG is a qualified substitute for the 7143LA55J based on functional and electrical equivalence. Selection between these parts should consider the following factors:

The 7143LA55J is obsolete and presents long-term procurement risk. The 7143LA20JG is active and maintains full product availability.

The 7143LA20JG achieves ROHS3 compliance, whereas the 7143LA55J is non-compliant. For applications subject to RoHS regulations or environmental standards, the 7143LA20JG is the appropriate choice.

The 7143LA20JG provides superior timing performance with 20 ns access and write cycle times compared to 55 ns. This performance improvement is backward compatible with designs specified for the 7143LA55J, as faster memory does not introduce timing violations in systems designed for slower components.

Both parts maintain identical electrical specifications, package geometry, and thermal operating ranges, ensuring direct substitution without circuit redesign or board layout modification.

Frequently Asked Questions (FAQ)

Q: Can the 7143LA20JG directly replace the 7143LA55J without circuit modifications?

A: Yes. The 7143LA20JG is electrically and mechanically equivalent to the 7143LA55J. Both parts feature identical memory capacity (32Kbit), organization (2K x 16), voltage supply range (4.5V ~ 5.5V), operating temperature range (0°C ~ 70°C), and 68-PLCC package specifications. The improved timing performance of the 7143LA20JG does not require circuit changes.

Q: What is the primary reason for substitution?

A: The 7143LA55J is classified as obsolete, creating supply chain risk. The 7143LA20JG is an active product from the same manufacturer with confirmed inventory availability, ensuring long-term component procurement.

Q: Are there compliance differences between these parts?

A: Yes. The 7143LA20JG is ROHS3 compliant, while the 7143LA55J is non-compliant. For applications requiring RoHS certification or environmental compliance, the 7143LA20JG is mandatory.

Q: Do both parts use the same package?

A: Yes. Both the 7143LA55J and 7143LA20JG use the 68-PLCC (J-Lead) surface mount package with identical dimensions (24.21x24.21 mm). No PCB layout changes are required.

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

A: Both parts are rated MSL 3 (168 Hours), indicating identical moisture handling and storage requirements.

Q: Is the faster access time of the 7143LA20JG a concern for legacy designs?

A: No. Faster memory is backward compatible with designs specified for slower components. The 20 ns access time of the 7143LA20JG will not introduce timing violations in systems originally designed for the 55 ns 7143LA55J.