Equivalent & Substitute Parts for 71321LA55J

Part Overview

The 71321LA55J is a 16Kbit dual-port asynchronous SRAM manufactured by Renesas Electronics Corporation in a 52-PLCC package. This memory IC operates with a 55 ns access time and is designed for parallel data interface applications requiring volatile memory storage in the 2K x 8 organization format.

The 71321LA55J carries an obsolete product status. Locating equivalent or substitute components becomes necessary when original inventory is depleted or when system redesigns require active, currently manufactured alternatives that maintain functional and mechanical compatibility.

Substiute Parts

71321LA55J

Renesas Electronics CorporationIn Stock: 210471321LA55J Datasheet

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71321LA20JG

Renesas Electronics CorporationIn Stock: 195371321LA20JG Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 71321LA55J is determined by the following critical parameters:

• Memory capacity and organization (16Kbit, 2K x 8 format)
• Dual-port asynchronous SRAM technology
• Parallel interface configuration
• 52-PLCC package footprint and pinout compatibility
• Supply voltage range (4.5V to 5.5V)
• Operating temperature range (0°C to 70°C)

The 71321LA20JG qualifies as a direct substitute because it maintains identical memory capacity, organization, technology, interface type, package, voltage specifications, and temperature range. The access time difference (20 ns versus 55 ns) represents an improvement in performance characteristics, making this substitute functionally compatible for all applications designed for the original part.

Parameter Comparison

Engineering Selection Recommendations

The 71321LA20JG is the appropriate substitute for the obsolete 71321LA55J. Both parts share identical memory specifications, package geometry, electrical operating parameters, and thermal characteristics, ensuring direct functional compatibility at the circuit board level.

The 71321LA20JG offers two significant advantages: it maintains active product status with current manufacturing availability, and it carries ROHS3 compliance certification, meeting modern environmental and regulatory requirements. The improved access time (20 ns versus 55 ns) provides performance headroom without introducing any compatibility constraints.

Selection of the 71321LA20JG eliminates obsolescence risk while maintaining full electrical and mechanical interchangeability with existing circuit designs.

Frequently Asked Questions (FAQ)

Q: Can the 71321LA20JG be used as a direct replacement for the 71321LA55J?

A: Yes. Both parts are manufactured by Renesas Electronics Corporation with identical memory capacity (16Kbit), organization (2K x 8), technology (dual-port asynchronous SRAM), interface type (parallel), package configuration (52-PLCC), supply voltage range (4.5V to 5.5V), and operating temperature range (0°C to 70°C). The 20 ns access time of the substitute is faster than the original 55 ns specification, ensuring compatibility with all timing-critical applications.

Q: What is the significance of the access time difference between these parts?

A: Access time defines the maximum delay from address input to valid data output. The 71321LA20JG with 20 ns access time is faster than the 71321LA55J with 55 ns access time. Faster access time does not create compatibility issues; it only improves performance margins in timing-sensitive circuits.

Q: Are the package dimensions and pinouts identical?

A: Yes. Both parts use the 52-PLCC (J-Lead) package with identical physical dimensions (19.13 x 19.13 mm) and pinout configuration. No PCB layout modifications are required for substitution.

Q: What is the difference in RoHS compliance status?

A: The 71321LA55J is RoHS non-compliant, while the 71321LA20JG is ROHS3 compliant. ROHS3 compliance indicates the substitute meets current environmental standards for hazardous substance restrictions, making it suitable for applications requiring regulatory compliance with modern manufacturing directives.

Q: Is the moisture sensitivity level the same for both parts?

A: Yes. Both parts carry an MSL rating of 3 (168 Hours), indicating identical moisture handling and storage requirements during manufacturing and assembly processes.