Equivalent & Substitute Parts for Renesas 7142SA100J SRAM Memory IC

Part Overview

The Renesas 7142SA100J is a 16Kbit dual-port asynchronous SRAM memory IC in a 52-PLCC package with 100 ns access time. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing system support and new designs. The part operates within the 4.5V to 5.5V supply range and is suitable for parallel memory interface applications requiring volatile storage.

Key Parameters

Parameter	Value
Memory Type	Volatile SRAM
Memory Format	Dual Port, Asynchronous
Memory Size	16Kbit
Memory Organization	2K x 8
Memory Interface	Parallel
Access 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

Substitute Part Grouping Explanation

The Renesas 7142LA20JG qualifies as a direct substitute for the 7142SA100J based on the following critical parameters:

Memory capacity and organization remain identical at 16Kbit with 2K x 8 configuration
Dual-port asynchronous SRAM technology is preserved
Parallel memory interface is maintained
Supply voltage range is compatible at 4.5V ~ 5.5V
Operating temperature range matches at 0°C ~ 70°C
Physical package remains 52-PLCC (J-Lead) with identical footprint dimensions of 19.13x19.13 mm
Surface mount mounting type is consistent

The 7142LA20JG provides improved performance with 20 ns access time compared to the original 100 ns specification, representing a performance upgrade while maintaining full backward compatibility at the functional and mechanical level.

Parameter Comparison

Parameter	7142SA100J (Original)	7142LA20JG (Substitute)
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation
Memory Type	Volatile SRAM	Volatile SRAM
Memory Format	Dual Port, Asynchronous	Dual Port, Asynchronous
Memory Size	16Kbit	16Kbit
Memory Organization	2K x 8	2K x 8
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)
Package Dimensions	19.13 x 19.13 mm	19.13 x 19.13 mm
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Compliance	Non-compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)
REACH Status	REACH Unaffected	REACH Unaffected
ECCN Classification	EAR99	EAR99

Engineering Selection Recommendations

The 7142LA20JG is the appropriate selection for applications currently using or requiring the 7142SA100J. The substitute part maintains full functional and mechanical compatibility while offering the following advantages:

The 7142LA20JG carries active product status, ensuring continued availability and supply chain reliability. The original 7142SA100J is classified as obsolete, creating long-term sourcing risk.

The 7142LA20JG achieves ROHS3 compliance, meeting current environmental and regulatory requirements. The 7142SA100J is non-compliant with RoHS standards, which may restrict use in regulated applications and markets.

Both parts share identical electrical specifications for supply voltage, operating temperature, and memory organization, ensuring direct functional substitution without circuit redesign. The improved access time of the 7142LA20JG (20 ns versus 100 ns) provides performance headroom and does not introduce compatibility issues in systems designed for the original 100 ns specification.

Frequently Asked Questions (FAQ)

Q: Can the 7142LA20JG be used as a direct replacement for the 7142SA100J without PCB modifications?

A: Yes. Both parts use the identical 52-PLCC package with matching footprint dimensions of 19.13 x 19.13 mm. No PCB layout changes are required for mechanical or electrical compatibility.

Q: Are the electrical specifications compatible between these two parts?

A: Yes. Both parts operate within the same 4.5V to 5.5V supply voltage range and 0°C to 70°C operating temperature range. Memory capacity, organization, and interface type are identical at 16Kbit, 2K x 8, and parallel interface respectively.

Q: What is the significance of the faster access time in the 7142LA20JG?

A: The 7142LA20JG provides 20 ns access time compared to the 100 ns specification of the 7142SA100J. This represents a performance upgrade. Systems designed for 100 ns operation will function correctly with the faster part, as timing requirements are met with margin.

Q: Why is product status relevant for component selection?

A: The 7142SA100J is classified as obsolete, indicating discontinued production and limited future availability. The 7142LA20JG maintains active status, ensuring reliable supply for current and future procurement.

Q: Does the RoHS compliance difference affect substitution?

A: The 7142LA20JG is ROHS3 compliant while the 7142SA100J is non-compliant. For applications subject to RoHS regulations or customer requirements, the 7142LA20JG is the required selection. For legacy systems without such constraints, both parts are electrically compatible.

Q: Are moisture sensitivity levels identical?

A: Yes. Both parts carry MSL rating 3 with 168-hour specification, indicating identical handling and storage requirements.

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