Equivalent & Substitute Parts for 71321LA55JI

Part Overview

The 71321LA55JI 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 supports parallel data interfaces across a 2K x 8 memory organization. The part is classified as obsolete, making identification of compatible substitutes essential for system maintenance, repair, and legacy equipment support. Active alternatives with improved performance characteristics are available from the same manufacturer.

Key Parameters

Parameter	Value
Memory Size	16Kbit
Memory Organization	2K x 8
Memory Type	Volatile SRAM
Technology	SRAM - Dual Port, Asynchronous
Memory Interface	Parallel
Access Time	55 ns
Write Cycle Time	55 ns
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	52-PLCC (J-Lead)
Mounting Type	Surface Mount
Physical Dimensions	19.13 x 19.13 mm

Substitute Part Grouping Explanation

Substitution eligibility for the 71321LA55JI is determined by strict equivalence across the following parameters:

Memory capacity and organization (16Kbit, 2K x 8)
Memory type and technology (Volatile SRAM, Dual Port, Asynchronous)
Interface type (Parallel)
Supply voltage range (4.5V ~ 5.5V)
Operating temperature range (-40°C ~ 85°C)
Package and pinout (52-PLCC, 19.13 x 19.13 mm)

The 71321LA25JGI qualifies as a direct substitute because it maintains identical specifications across all these critical parameters. The primary difference is improved access time performance (25 ns versus 55 ns), which represents a performance upgrade rather than a functional incompatibility. Both parts share the same base product number (71321LA) and are manufactured by Renesas Electronics Corporation.

Parameter Comparison

Parameter	71321LA55JI (Main Part)	71321LA25JGI (Substitute)
Memory Size	16Kbit	16Kbit
Memory Organization	2K x 8	2K x 8
Memory Type	Volatile SRAM	Volatile SRAM
Technology	SRAM - Dual Port, Asynchronous	SRAM - Dual Port, Asynchronous
Memory Interface	Parallel	Parallel
Access Time	55 ns	25 ns
Write Cycle Time	55 ns	25 ns
Voltage Supply Range	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	52-PLCC (J-Lead)	52-PLCC (J-Lead)
Mounting Type	Surface Mount	Surface Mount
Physical Dimensions	19.13 x 19.13 mm	19.13 x 19.13 mm
Product Status	Obsolete	Active
RoHS Compliance	Non-compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

The 71321LA25JGI is the appropriate substitute for the obsolete 71321LA55JI. Selection is based on the following factors:

Product Status: The 71321LA55JI is classified as obsolete, while the 71321LA25JGI maintains active product status with current manufacturing support and availability.

Compliance and Certifications: The 71321LA25JGI achieves ROHS3 compliance, whereas the original part is non-compliant. For applications subject to environmental regulations or procurement standards requiring RoHS compliance, the substitute part satisfies these requirements.

Functional Equivalence: Both parts maintain identical memory capacity, organization, interface type, voltage specifications, and temperature operating range. Pinout and package dimensions are identical, enabling direct board-level replacement without layout modifications.

Performance Characteristics: The 71321LA25JGI provides faster access and write cycle times (25 ns versus 55 ns). This performance improvement is backward-compatible with system designs originally specified for the 71321LA55JI, as faster memory does not introduce timing violations in circuits designed for slower access times.

Frequently Asked Questions (FAQ)

Q: Can the 71321LA25JGI be used as a direct replacement for the 71321LA55JI?

A: Yes. Both parts are pin-compatible with identical package dimensions (52-PLCC, 19.13 x 19.13 mm), memory capacity (16Kbit), organization (2K x 8), and electrical specifications (4.5V ~ 5.5V supply, -40°C ~ 85°C operating range). The substitute part can be soldered directly into existing PCB footprints without modification.

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

A: The access time and write cycle time differ. The 71321LA55JI operates at 55 ns, while the 71321LA25JGI operates at 25 ns. This represents a performance upgrade with no functional incompatibility.

Q: Are there any compliance differences?

A: Yes. The 71321LA25JGI is ROHS3 compliant, while the 71321LA55JI is non-compliant. For applications requiring RoHS certification, the substitute part meets these requirements.

Q: Will the faster access time of the 71321LA25JGI cause compatibility issues?

A: No. Faster memory access times are backward-compatible with circuits designed for slower parts. System timing margins are maintained or improved when substituting a faster part for a slower one.

Q: Are both parts manufactured by the same company?

A: Yes. Both the 71321LA55JI and 71321LA25JGI are manufactured by Renesas Electronics Corporation and share the same base product number (71321LA).

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

A: Both parts have a Moisture Sensitivity Level (MSL) of 3, requiring storage and handling within 168-hour exposure limits to prevent moisture absorption.

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