Renesas Electronics 7140SA20J SRAM Equivalent & Substitute Parts

Part Overview

The Renesas Electronics 7140SA20J is an 8Kbit dual-port asynchronous SRAM memory IC in a 52-PLCC package with 20 ns access time and parallel interface. This component is classified as obsolete, making substitute parts necessary for ongoing system support, maintenance, and new production requirements. The part operates within a 4.5V to 5.5V supply range and is suitable for applications requiring volatile parallel memory with fast access characteristics.

Key Parameters

Parameter	Value
Memory Type	Volatile SRAM
Memory Format	Dual Port, Asynchronous
Memory Size	8Kbit
Memory Organization	1K x 8
Memory Interface	Parallel
Access Time	20 ns
Write Cycle Time	20 ns
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	52-PLCC (J-Lead)
Mounting Type	Surface Mount
Moisture Sensitivity Level	MSL 3 (168 Hours)

Substitute Part Grouping Explanation

Substitution for the 7140SA20J is determined by strict equivalence across the following critical parameters:

Memory capacity and organization (8Kbit, 1K x 8 configuration)
Dual-port asynchronous SRAM technology
Parallel interface architecture
Access and write cycle timing (20 ns)
Supply voltage compatibility (4.5V ~ 5.5V)
Package form factor (52-PLCC with J-Lead configuration)
Operating temperature range (0°C ~ 70°C)
Moisture sensitivity classification (MSL 3)

The 7140LA20JG qualifies as a direct substitute based on complete alignment with all electrical and mechanical parameters. Both parts share identical memory specifications, timing characteristics, and physical packaging requirements.

Parameter Comparison

Parameter	7140SA20J (Main Part)	7140LA20JG (Substitute)
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation
Memory Type	Volatile SRAM	Volatile SRAM
Memory Format	Dual Port, Asynchronous	Dual Port, Asynchronous
Memory Size	8Kbit	8Kbit
Memory Organization	1K x 8	1K x 8
Memory Interface	Parallel	Parallel
Access Time	20 ns	20 ns
Write Cycle Time	20 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
Moisture Sensitivity Level	MSL 3 (168 Hours)	MSL 3 (168 Hours)
Product Status	Obsolete	Last Time Buy
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The 7140LA20JG is the qualified substitute for the obsolete 7140SA20J. Both parts maintain identical electrical performance and physical compatibility. The primary distinction is product lifecycle status and regulatory compliance. The 7140LA20J carries Last Time Buy status, indicating limited availability, while the 7140SA20J is fully obsolete. The 7140LA20JG achieves ROHS3 compliance, whereas the original part does not meet RoHS requirements. For new designs or system refreshes, the 7140LA20JG provides equivalent functionality with improved regulatory standing. Both parts are subject to identical moisture sensitivity handling protocols and operate within the same environmental specifications.

Frequently Asked Questions (FAQ)

Q: Can the 7140LA20JG directly replace the 7140SA20J in existing circuit designs?

A: Yes. The 7140LA20JG provides complete electrical and mechanical equivalence. Pin configuration, timing characteristics, voltage requirements, and package dimensions are identical. No circuit modifications are required for substitution.

Q: What is the significance of the product status difference between these parts?

A: The 7140SA20J is classified as obsolete, meaning it is no longer manufactured and existing inventory is depleted. The 7140LA20JG carries Last Time Buy status, indicating limited production runs remain available before discontinuation. For ongoing supply requirements, the 7140LA20JG should be prioritized while inventory exists.

Q: Does the RoHS3 compliance of the 7140LA20JG affect compatibility?

A: No. RoHS compliance is a manufacturing and material standard that does not alter electrical performance or physical compatibility. The 7140LA20JG operates identically to the 7140SA20J in circuit applications. RoHS3 compliance indicates improved environmental and regulatory alignment for systems subject to these requirements.

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

A: Both parts share identical moisture sensitivity classification (MSL 3, 168 hours) and require equivalent storage and handling protocols. The 7140LA20JG is supplied in tube packaging, while the 7140SA20J packaging format is not specified. This distinction affects logistics and inventory management but not component performance.

Q: What is the 52-PLCC package specification?

A: The 52-PLCC (Plastic Leaded Chip Carrier) is a surface-mount package with J-lead configuration measuring 19.13 x 19.13 mm. This package type accommodates 52 connection points and is standard for both the main part and substitute. PCB footprint and reflow soldering parameters remain consistent across both parts.

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