Renesas Electronics 7143LA55PF8 SRAM Equivalent & Substitute Parts

Part Overview

The Renesas Electronics 7143LA55PF8 is a 32Kbit dual-port asynchronous SRAM with parallel interface, housed in a 100-TQFP package. This memory IC operates at 4.5V to 5.5V supply voltage with a 55 ns access time and write cycle time. The part is classified as obsolete, making identification of compatible substitutes essential for ongoing system support and new design implementations.

Substiute Parts

7143LA55PF8

Renesas Electronics CorporationIn Stock: 9057143LA55PF8 Datasheet

Current PartRFQ

7143LA20JG8

Renesas Electronics CorporationIn Stock: 11867143LA20JG8 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 7143LA55PF8 is determined by the following critical parameters:

• Memory capacity and organization (32Kbit, 2K x 16 configuration)
• Dual-port asynchronous SRAM technology
• Parallel interface architecture
• Supply voltage compatibility (4.5V ~ 5.5V)
• Operating temperature range (0°C ~ 70°C)
• Surface mount technology requirement

The 7143LA20JG8 qualifies as a manufacturer-recommended substitute because it maintains identical memory specifications, voltage requirements, temperature range, and technology platform. Differences in access time (20 ns versus 55 ns) and package format (68-PLCC versus 100-TQFP) represent performance improvements and alternative packaging, respectively, and do not preclude substitution when physical and electrical constraints permit.

Parameter Comparison

Engineering Selection Recommendations

The 7143LA20JG8 is the manufacturer-recommended substitute for the obsolete 7143LA55PF8. Selection of this substitute is supported by the following factors:

• Identical memory capacity, organization, and interface specifications ensure functional compatibility
• Faster access and write cycle times (20 ns) provide performance improvement over the original part
• Active product status ensures continued availability and supply chain reliability
• ROHS3 compliance addresses environmental and regulatory requirements not met by the original non-compliant part
• Equivalent MSL rating maintains moisture sensitivity handling requirements

Package format change from 100-TQFP to 68-PLCC requires PCB layout modification and must be evaluated against physical space constraints and board design parameters.

Frequently Asked Questions (FAQ)

Q: Can the 7143LA20JG8 directly replace the 7143LA55PF8 without circuit modification?

A: Electrical compatibility is confirmed across all critical parameters: memory capacity, organization, interface type, voltage supply, and temperature range. However, the package format differs (68-PLCC versus 100-TQFP), requiring PCB footprint redesign and layout adjustment.

Q: What is the significance of the faster access time in the 7143LA20JG8?

A: The 20 ns access time in the substitute part is faster than the original 55 ns specification. This represents a performance improvement and does not create compatibility issues in systems designed for the slower original part, as timing requirements are met or exceeded.

Q: Are there compliance differences between these parts?

A: Yes. The 7143LA55PF8 is RoHS non-compliant, while the 7143LA20JG8 is ROHS3 compliant. For applications subject to environmental regulations or customer requirements, the substitute part provides compliance alignment.

Q: What does the package designation change mean for implementation?

A: The 100-TQFP package has 100 pins in a 14x14mm footprint, while the 68-PLCC package has 68 pins in a 24.21x24.21mm footprint. Pin count and physical dimensions differ, necessitating complete PCB redesign for the substitute part.

Q: Is the 7143LA20JG8 the only available substitute?

A: Based on provided data, the 7143LA20JG8 is identified as the manufacturer-recommended substitute. Evaluation of additional alternatives requires expanded component database parameters.