Equivalent & Substitute Parts for 7142LA55J

Part Overview

The 7142LA55J 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 interface applications requiring volatile memory storage in the 2K x 8 organization format. The part is classified as obsolete, making identification of compatible substitute components essential for system maintenance, repair, and legacy equipment support.

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	0°C ~ 70°C
Package Type	52-PLCC (J-Lead)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the 7142LA55J is determined by strict alignment of the following critical parameters:

Memory capacity and organization (16Kbit, 2K x 8 format)
Memory type and technology (Volatile SRAM, dual-port asynchronous)
Interface type (Parallel)
Package and pinout compatibility (52-PLCC J-Lead)
Voltage supply range (4.5V ~ 5.5V)
Operating temperature range (0°C ~ 70°C)

The 7142LA20JG qualifies as a direct substitute based on identical memory capacity, organization, technology, interface, package, voltage, and temperature specifications. The substitute part shares the same base product number (7142LA) and maintains full electrical and mechanical compatibility. The primary distinction is improved access time performance (20 ns versus 55 ns), which represents a performance upgrade rather than a functional limitation.

Parameter Comparison

Parameter	7142LA55J (Main Part)	7142LA20JG (Substitute)
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation
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	20 ns
Write Cycle Time	55 ns	20 ns
Voltage Supply Range	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C
Package Type	52-PLCC (J-Lead)	52-PLCC (J-Lead)
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The 7142LA20JG is a qualified substitute for the 7142LA55J based on complete electrical and mechanical compatibility. The substitute part maintains active product status with Renesas Electronics Corporation, ensuring continued availability and supply chain reliability. The 7142LA20JG achieves ROHS3 compliance, whereas the original part is RoHS non-compliant, providing environmental and regulatory advantages for new designs and system upgrades. Both parts share identical voltage supply and operating temperature specifications, confirming direct functional interchangeability in existing circuit implementations. The improved access time of the substitute part (20 ns) presents no compatibility concerns and may enhance system performance margins.

Frequently Asked Questions (FAQ)

Q: Can the 7142LA20JG directly replace the 7142LA55J in existing applications?

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 J-Lead), voltage supply range (4.5V ~ 5.5V), and operating temperature range (0°C ~ 70°C). Pinout and electrical characteristics are fully compatible.

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

A: The 7142LA20JG features a faster access time of 20 ns compared to the 7142LA55J at 55 ns. This represents a performance improvement with no functional limitations. The substitute part also maintains active product status and ROHS3 compliance, whereas the original part is obsolete and RoHS non-compliant.

Q: Are there any package or mounting considerations for substitution?

A: No. Both parts use identical 52-PLCC (J-Lead) surface mount packaging with dimensions of 19.13 x 19.13 mm. PCB footprints and assembly processes remain unchanged.

Q: Does the faster access time of the substitute part affect circuit operation?

A: No. Faster access time is a performance enhancement that maintains backward compatibility. Systems designed for 55 ns operation will function correctly with the 20 ns substitute part.

Q: What is the significance of the RoHS compliance difference?

A: The 7142LA20JG is ROHS3 compliant, meeting current environmental and hazardous substance restrictions. The 7142LA55J is RoHS non-compliant. For new designs and systems subject to environmental regulations, the substitute part is the appropriate selection.

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