Equivalent & Substitute Parts for 7143LA55J8

Part Overview

The 7143LA55J8 is a 32Kbit dual-port asynchronous SRAM manufactured by Renesas Electronics Corporation in a 68-PLCC surface mount package. This part features a 55 ns access time and parallel memory interface with 2K x 16 organization. The device is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing system support and new designs requiring this memory architecture.

Substiute Parts

7143LA55J8

Renesas Electronics CorporationIn Stock: 10947143LA55J8 Datasheet

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7143LA20JG8

Renesas Electronics CorporationIn Stock: 11867143LA20JG8 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 7143LA55J8 is determined by strict equivalence across the following critical parameters:

Memory capacity and organization (32Kbit, 2K x 16) must remain identical to maintain address and data bus compatibility. The dual-port asynchronous SRAM architecture is non-negotiable for functional replacement. The 68-PLCC package footprint and surface mount configuration must match exactly to ensure PCB compatibility without redesign. Supply voltage range (4.5V ~ 5.5V) and operating temperature range (0°C ~ 70°C) define the electrical operating envelope.

The 7143LA20JG8 qualifies as a direct substitute based on these parameters. While this part features improved access time (20 ns versus 55 ns), it maintains identical memory capacity, organization, interface type, package, voltage specifications, and temperature range. Faster access time represents a performance upgrade with no functional incompatibility.

Parameter Comparison

Engineering Selection Recommendations

The 7143LA20JG8 is the qualified substitute for the 7143LA55J8. Selection of this part is supported by the following engineering factors:

The 7143LA20JG8 maintains active product status, ensuring long-term availability and supply chain continuity compared to the obsolete 7143LA55J8. The substitute achieves ROHS3 compliance, meeting current environmental and regulatory requirements, whereas the main part is non-compliant. Both parts share identical memory specifications, electrical characteristics, and physical packaging, enabling direct replacement without circuit modification.

The improved access time of the 7143LA20JG8 (20 ns) provides performance headroom relative to the original specification (55 ns), ensuring compatibility with timing-critical applications without degradation of system performance.

Frequently Asked Questions (FAQ)

Q: Can the 7143LA20JG8 be used as a direct replacement for the 7143LA55J8 in existing designs?

A: Yes. Both parts are identical in memory capacity (32Kbit), organization (2K x 16), package (68-PLCC), voltage supply (4.5V ~ 5.5V), and operating temperature range (0°C ~ 70°C). No PCB modifications or circuit redesign are required.

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

A: The 7143LA20JG8 features faster access time (20 ns) and write cycle time (20 ns) compared to the 7143LA55J8 (55 ns). The substitute also maintains active product status and ROHS3 compliance, whereas the original part is obsolete and non-compliant.

Q: Are there any timing considerations when substituting the 7143LA20JG8 for the 7143LA55J8?

A: No adverse timing effects occur. The faster access time of the substitute part is backward compatible with designs specified for 55 ns operation. System timing margins improve with the faster device.

Q: Does the packaging differ between these parts?

A: No. Both parts use the 68-PLCC (24.21x24.21) surface mount package with identical pinout and footprint.

Q: What is the compliance status difference between these parts?

A: The 7143LA55J8 is RoHS non-compliant. The 7143LA20JG8 is ROHS3 compliant, meeting current environmental regulations for new designs and manufacturing environments.