Equivalent & Substitute Parts for Renesas 7142LA35J SRAM Memory IC

Part Overview

The Renesas 7142LA35J is a 16Kbit dual-port asynchronous SRAM memory IC in 52-PLCC surface mount packaging. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing system support and new designs. The part operates within a 4.5V to 5.5V supply voltage range with a 35 ns access time 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	35 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 eligibility for the 7142LA35J is determined by the following critical parameters:

Memory capacity and organization (16Kbit, 2K x 8 configuration)
Dual-port asynchronous SRAM technology
Parallel memory interface architecture
Package compatibility (52-PLCC J-Lead form factor)
Supply voltage range (4.5V ~ 5.5V)
Operating temperature range (0°C ~ 70°C)
Surface mount mounting type

The 7142LA20JG qualifies as a direct substitute because it maintains identical memory capacity, organization, technology, interface type, package form factor, voltage specifications, and temperature range. The primary difference is an improved access time specification of 20 ns versus the original 35 ns, which represents a performance upgrade rather than a functional incompatibility.

Parameter Comparison

Parameter	7142LA35J (Main Part)	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	35 ns	20 ns
Write Cycle Time	35 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	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The 7142LA20JG is the qualified substitute for the obsolete 7142LA35J. Selection of the 7142LA20JG provides the following advantages:

Active product status ensures continued availability and manufacturing support
ROHS3 compliance meets current environmental and regulatory requirements, whereas the original part is RoHS non-compliant
Faster access time (20 ns) and write cycle time (20 ns) provide improved performance margins without requiring circuit redesign
Identical electrical and mechanical specifications ensure direct pin-for-pin and footprint compatibility
Both parts maintain REACH unaffected status and EAR99 export classification

For applications where the original 35 ns timing specification is a design constraint, the 20 ns substitute remains functionally compatible as it exceeds the performance requirement.

Frequently Asked Questions (FAQ)

Q: Can the 7142LA20JG be used as a direct replacement for the 7142LA35J?

A: Yes. The 7142LA20JG is a direct substitute. Both parts share identical memory capacity (16Kbit), organization (2K x 8), technology (dual-port asynchronous SRAM), interface type (parallel), package form factor (52-PLCC J-Lead), supply voltage range (4.5V ~ 5.5V), and operating temperature range (0°C ~ 70°C). The 20 ns access time of the substitute is faster than the original 35 ns specification, making it functionally compatible for all applications designed for the 7142LA35J.

Q: Are there any PCB layout or footprint modifications required?

A: No. Both the 7142LA35J and 7142LA20JG use identical 52-PLCC J-Lead packaging with the same physical dimensions (19.13 x 19.13 mm). No PCB layout changes are necessary for substitution.

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

A: The 7142LA35J is RoHS non-compliant, while the 7142LA20JG is ROHS3 compliant. For new designs and applications subject to RoHS regulations, the 7142LA20JG is the appropriate selection. For legacy system repairs where RoHS compliance is not a requirement, either part may be used based on availability.

Q: Does the faster access time of the 7142LA20JG affect circuit operation?

A: No. The 20 ns access time of the substitute is faster than the original 35 ns specification. Circuits designed for 35 ns timing will operate correctly with the faster 20 ns part, as timing margins are improved rather than reduced.

Q: Are the moisture sensitivity levels identical?

A: Yes. Both parts have MSL 3 rating with a 168-hour floor life specification. Identical handling and storage procedures apply to both components.

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