Equivalent & Substitute Parts for 7142SA35J

Part Overview

The 7142SA35J is a 16Kbit dual-port asynchronous SRAM manufactured by Renesas Electronics Corporation in a 52-PLCC package. This memory IC operates with a 35 ns access time and supports parallel data interfaces across a 2K x 8 memory organization. The part is classified as obsolete, making identification of compatible alternatives essential for system maintenance, legacy equipment repair, and design updates where continued supply cannot be guaranteed.

Key Parameters

Parameter	Value
Memory Type	Volatile SRAM
Memory Size	16Kbit
Memory Organization	2K x 8
Memory Interface	Parallel
Technology	SRAM - Dual Port, Asynchronous
Access Time	35 ns
Write Cycle Time	35 ns
Voltage Supply	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 of the 7142SA35J is determined by strict equivalence across the following critical parameters:

Memory capacity and organization (16Kbit, 2K x 8)
Memory technology (dual-port asynchronous SRAM)
Parallel interface architecture
Package form factor (52-PLCC with identical physical dimensions)
Supply voltage range (4.5V ~ 5.5V compatibility)
Operating temperature range (0°C ~ 70°C)

The 7142LA20JG qualifies as a direct substitute because it maintains identical memory specifications, package geometry, electrical operating conditions, and interface characteristics. The primary distinction is improved access time performance (20 ns versus 35 ns), which represents a performance upgrade rather than a functional incompatibility.

Parameter Comparison

Parameter	7142SA35J (Main Part)	7142LA20JG (Substitute)
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation
Memory Type	Volatile SRAM	Volatile SRAM
Memory Size	16Kbit	16Kbit
Memory Organization	2K x 8	2K x 8
Memory Interface	Parallel	Parallel
Technology	SRAM - Dual Port, Asynchronous	SRAM - Dual Port, Asynchronous
Access Time	35 ns	20 ns
Write Cycle Time	35 ns	20 ns
Voltage Supply	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
MSL Rating	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

The 7142LA20JG is the qualified substitute for the 7142SA35J based on the following factors:

Functional Compatibility: Both parts share identical memory architecture, capacity, organization, and interface specifications. Pin-to-pin compatibility is maintained through the identical 52-PLCC package footprint.

Performance Upgrade: The 7142LA20JG provides faster access and write cycle times (20 ns versus 35 ns). This represents a performance improvement that does not introduce incompatibility with systems designed for the original 35 ns specification.

Product Status and Supply: The 7142SA35J is obsolete, whereas the 7142LA20JG maintains active product status, ensuring continued availability and supply chain reliability.

Compliance Advantage: The 7142LA20JG is ROHS3 compliant, whereas the 7142SA35J is non-compliant. For applications subject to RoHS regulations, the substitute part satisfies compliance requirements.

Electrical and Environmental Equivalence: Both parts operate within identical voltage supply ranges (4.5V ~ 5.5V) and temperature ranges (0°C ~ 70°C), ensuring direct electrical substitution without circuit modification.

Frequently Asked Questions (FAQ)

Q: Can the 7142LA20JG be used as a direct replacement for the 7142SA35J in existing designs?

A: Yes. The 7142LA20JG is electrically and mechanically compatible with the 7142SA35J. Both parts feature identical memory capacity, organization, interface type, package geometry, and operating voltage and temperature ranges. No circuit modifications are required.

Q: What is the primary difference between these two parts?

A: The primary difference is access time and write cycle time. The 7142LA20JG operates at 20 ns, while the 7142SA35J operates at 35 ns. The 7142LA20JG is a performance upgrade. Additionally, the 7142LA20JG is ROHS3 compliant and maintains active product status, whereas the 7142SA35J is obsolete and non-compliant.

Q: Are the package dimensions identical?

A: Yes. Both parts use the 52-PLCC (J-Lead) package with dimensions of 19.13 x 19.13 mm. PCB footprints and mounting requirements are identical.

Q: Does the faster access time of the 7142LA20JG create any compatibility issues?

A: No. Faster access time does not create incompatibility. Systems designed for 35 ns access time will operate correctly with a 20 ns part, as the faster part meets or exceeds the original timing requirements.

Q: What is the moisture sensitivity level for both parts?

A: Both parts carry an MSL rating of 3 (168 Hours), indicating identical moisture handling and storage requirements.

Q: Is the 7142LA20JG available in the same packaging format?

A: Yes. The 7142LA20JG is supplied in tube packaging, maintaining the same 52-PLCC form factor as the original part.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message