Equivalent & Substitute Parts for Renesas 7143LA35PF

Part Overview

The Renesas 7143LA35PF is a 32Kbit dual-port asynchronous SRAM with parallel interface, housed in a 100-TQFP package. This component is classified as obsolete, making equivalent substitutes necessary for ongoing system support and new designs. The part operates within a 4.5V to 5.5V supply range with a 35 ns access time and is designed for applications requiring high-speed volatile memory with dual-port architecture.

Substiute Parts

7143LA35PF

Renesas Electronics CorporationIn Stock: 7097143LA35PF Datasheet

Current PartRFQ

7143LA20JG

Renesas Electronics CorporationIn Stock: 13487143LA20JG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 7143LA35PF is determined by the following critical parameters:

• Memory capacity (32Kbit) and organization (2K x 16) must remain identical
• Dual-port asynchronous SRAM architecture is mandatory
• Parallel interface configuration must be preserved
• Supply voltage range (4.5V ~ 5.5V) must be compatible
• Operating temperature range (0°C ~ 70°C) must be maintained
• Access time and write cycle time may be equal or faster than the original specification

The 7143LA20JG qualifies as a direct substitute based on these criteria. While it features a different package type (68-PLCC versus 100-TQFP) and improved access time (20 ns versus 35 ns), the core memory architecture, capacity, organization, interface type, and electrical specifications remain functionally equivalent.

Parameter Comparison

Engineering Selection Recommendations

The 7143LA20JG is the qualified substitute for the 7143LA35PF based on the following factors:

• Both parts share identical memory architecture, capacity, and organization
• The substitute operates at faster access and write cycle times (20 ns versus 35 ns), providing performance improvement
• Electrical specifications and operating conditions are fully compatible
• The 7143LA20JG maintains active product status, ensuring continued availability and supply chain support
• The substitute achieves ROHS3 compliance, whereas the original part is RoHS non-compliant
• Package differences (68-PLCC versus 100-TQFP) require PCB layout modification but do not affect functional compatibility

Frequently Asked Questions (FAQ)

Q: Can the 7143LA20JG directly replace the 7143LA35PF without design changes?

A: The 7143LA20JG is functionally equivalent in memory architecture and electrical specifications. However, the package change from 100-TQFP to 68-PLCC requires PCB footprint modification. Pin-to-pin compatibility must be verified against the respective datasheets.

Q: What is the significance of the faster access time in the 7143LA20JG?

A: The 20 ns access time of the 7143LA20JG is faster than the 35 ns specification of the 7143LA35PF. This improvement is backward-compatible and does not create timing conflicts in systems designed for the original part.

Q: Why is RoHS compliance important for this substitution?

A: The 7143LA20JG achieves ROHS3 compliance while the original part does not. This is relevant for applications subject to environmental regulations or customer requirements mandating RoHS-compliant components.

Q: Are there any electrical differences between these parts?

A: No. Both parts operate within the same 4.5V to 5.5V supply range and 0°C to 70°C temperature range. Memory organization, interface type, and dual-port architecture are identical.

Q: What considerations apply to the package change?

A: The 68-PLCC package is larger than the 100-TQFP package. PCB layout must accommodate the different footprint dimensions (24.21x24.21 mm for PLCC versus 14x14 mm for TQFP). Pin assignment and signal routing require verification against device datasheets.