Equivalent & Substitute Parts for 7142SA55J

Part Overview

The 7142SA55J is a 16Kbit dual-port asynchronous SRAM manufactured by Renesas Electronics Corporation in a 52-PLCC package. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing system support and new designs. The part operates with a 55 ns access time and requires a 4.5V to 5.5V supply voltage, serving applications requiring parallel memory interface with volatile storage characteristics.

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 7142SA55J is determined by the following critical parameters:

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

The 7142LA20JG qualifies as a direct substitute based on matching all mechanical and electrical compatibility criteria. This part maintains identical memory capacity, organization, technology, interface type, package configuration, voltage specifications, and temperature range. The primary distinction is improved access time performance (20 ns versus 55 ns), which represents a performance upgrade rather than a compatibility limitation.

Parameter Comparison

Parameter	7142SA55J (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 the qualified substitute for the 7142SA55J based on the following engineering criteria:

Mechanical compatibility is assured through identical 52-PLCC package specifications, pinout configuration, and surface mount characteristics. Electrical compatibility is maintained across all critical parameters including memory capacity, organization, interface type, supply voltage range, and operating temperature specifications.

The 7142LA20JG offers additional advantages in terms of product lifecycle status and regulatory compliance. The substitute part is classified as active, ensuring continued availability and manufacturing support. The 7142LA20JG achieves ROHS3 compliance, whereas the original 7142SA55J is non-compliant, making the substitute preferable for applications subject to environmental regulations.

Performance characteristics of the substitute exceed the original specification. The 20 ns access and write cycle times represent a 2.75x improvement over the 55 ns specification of the 7142SA55J. This performance enhancement is backward-compatible with designs originally specified for the slower part.

Frequently Asked Questions (FAQ)

Q: Can the 7142LA20JG be used as a direct replacement for the 7142SA55J in existing designs?

A: Yes. The 7142LA20JG maintains identical pinout, package footprint, memory capacity, organization, interface type, supply voltage range, and operating temperature specifications. No circuit modifications are required for substitution.

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

A: The 7142LA20JG operates at 20 ns access time compared to 55 ns for the 7142SA55J. This represents faster memory response. Systems designed for 55 ns operation will function correctly with the faster 20 ns part, as timing requirements are met or exceeded.

Q: Are there packaging or handling differences between these parts?

A: Both parts use 52-PLCC surface mount packages with identical physical dimensions (19.13x19.13 mm). The 7142LA20JG is supplied in tube packaging, while the 7142SA55J packaging specification was not provided. Both parts have Moisture Sensitivity Level 3 (168 Hours) classification.

Q: What is the impact of RoHS compliance on part selection?

A: The 7142LA20JG is ROHS3 compliant, while the 7142SA55J is non-compliant. For applications subject to RoHS regulations or customer requirements, the 7142LA20JG is the appropriate selection.

Q: Is the 7142LA20JG available for procurement?

A: The 7142LA20JG is classified as active product status with documented inventory availability, ensuring supply chain continuity for new designs and replacement applications.

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