Renesas Electronics 7140LA100J SRAM Equivalent & Substitute Parts

Part Overview

The Renesas Electronics 7140LA100J is an 8Kbit dual-port asynchronous SRAM memory IC in a 52-PLCC package with 100 ns access time. This component is classified as obsolete, making identification of functionally compatible alternatives essential for system maintenance, repair, and legacy equipment support. The part operates within a 4.5V to 5.5V supply range and is suitable for parallel memory interface applications requiring volatile storage.

Key Parameters

Parameter	Value
Memory Size	8Kbit
Memory Organization	1K x 8
Memory Type	Volatile SRAM
Technology	SRAM - Dual Port, Asynchronous
Memory Interface	Parallel
Access Time	100 ns
Write Cycle Time	100 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 7140LA100J is determined by the following critical parameters:

Core Compatibility Requirements:

Memory capacity: 8Kbit (1K x 8 organization)
Memory type: Volatile SRAM with dual-port asynchronous architecture
Memory interface: Parallel
Package: 52-PLCC (J-Lead) form factor
Supply voltage: 4.5V ~ 5.5V compatibility
Operating temperature range: 0°C ~ 70°C minimum support

Performance Consideration:

Access time and write cycle time may be equal to or faster than the original specification without functional impact

The substitute part 7140LA20JG meets all core compatibility requirements. This part maintains identical memory capacity, organization, technology, interface, package, voltage, and temperature specifications while providing improved access time performance (20 ns versus 100 ns).

Parameter Comparison

Parameter	7140LA100J (Main Part)	7140LA20JG (Substitute)
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation
Memory Size	8Kbit	8Kbit
Memory Organization	1K x 8	1K x 8
Memory Type	Volatile SRAM	Volatile SRAM
Technology	SRAM - Dual Port, Asynchronous	SRAM - Dual Port, Asynchronous
Memory Interface	Parallel	Parallel
Access Time	100 ns	20 ns
Write Cycle Time	100 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	Last Time Buy
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

The 7140LA20JG is a direct functional substitute for the 7140LA100J. Both parts share identical memory specifications, electrical characteristics, and physical packaging. The substitute provides superior access time performance (20 ns versus 100 ns), which is backward-compatible with the original application.

Compliance Considerations:

The 7140LA20JG holds ROHS3 compliance status, whereas the 7140LA100J is RoHS non-compliant. For applications subject to RoHS regulatory requirements, the substitute part satisfies compliance obligations while maintaining full functional compatibility.

Availability Status:

The 7140LA100J is classified as obsolete with limited inventory availability. The 7140LA20JG is designated Last Time Buy, indicating a defined end-of-life window. Both parts are currently in stock through authorized distributors.

Frequently Asked Questions (FAQ)

Q: Can the 7140LA20JG replace the 7140LA100J in existing designs?

A: Yes. The 7140LA20JG is functionally compatible across all electrical and mechanical parameters. The faster access time (20 ns) does not create compatibility issues in applications originally specified for 100 ns operation.

Q: Are the package dimensions identical between these parts?

A: Yes. Both parts use the 52-PLCC (J-Lead) package with dimensions of 19.13 x 19.13 mm. Pin configuration and mounting footprint are identical, enabling direct board-level substitution.

Q: What is the difference in supply voltage requirements?

A: Both parts operate within the identical 4.5V to 5.5V supply range. No power supply modifications are required for substitution.

Q: Does the substitute part support the same operating temperature range?

A: Yes. Both parts are rated for 0°C to 70°C operating temperature, maintaining thermal compatibility with the original specification.

Q: Why is the 7140LA20JG classified as Last Time Buy?

A: Last Time Buy status indicates that the manufacturer has announced end-of-life for this product line. Existing inventory represents the final production run available through distribution channels.

Q: Are there RoHS compliance implications for substitution?

A: The 7140LA20JG is ROHS3 compliant, whereas the 7140LA100J is non-compliant. For applications subject to RoHS directives, the substitute part satisfies regulatory requirements.

Q: What is the Moisture Sensitivity Level for both parts?

A: Both parts carry MSL 3 rating with a 168-hour floor life. Identical moisture handling and storage protocols apply to both components.

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