Equivalent & Substitute Parts for 7143LA35J

Part Overview

The 7143LA35J is a 32Kbit dual-port asynchronous SRAM manufactured by Renesas Electronics Corporation, packaged in a 68-PLCC surface mount configuration. This memory IC operates with a 35 ns access time and write cycle time, designed for parallel memory interface applications requiring volatile storage. The part is classified as obsolete, making identification of compatible substitutes essential for system maintenance, repair, and legacy equipment support.

Key Parameters

Parameter	Value
Memory Type	Volatile SRAM
Memory Format	Dual Port, Asynchronous
Memory Size	32Kbit
Memory Organization	2K x 16
Memory Interface	Parallel
Access Time	35 ns
Write Cycle Time	35 ns
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	68-PLCC (J-Lead)
Mounting Type	Surface Mount
Physical Dimensions	24.21 x 24.21 mm

Substitute Part Grouping Explanation

Substitution eligibility for the 7143LA35J is determined by strict equivalence across the following critical parameters:

Memory capacity and organization (32Kbit, 2K x 16 configuration)
Dual-port asynchronous SRAM technology
Parallel memory interface architecture
Package type and physical dimensions (68-PLCC, 24.21 x 24.21 mm)
Supply voltage compatibility (4.5V ~ 5.5V range)
Operating temperature range (0°C ~ 70°C)

The 7143LA20JG qualifies as a direct substitute based on identical memory specifications, organization, interface type, packaging, voltage requirements, and temperature range. The primary distinction is improved access time and write cycle time performance (20 ns versus 35 ns), which represents a performance upgrade rather than a functional incompatibility.

Parameter Comparison

Parameter	7143LA35J (Main Part)	7143LA20JG (Substitute)
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation
Memory Type	Volatile SRAM	Volatile SRAM
Memory Format	Dual Port, Asynchronous	Dual Port, Asynchronous
Memory Size	32Kbit	32Kbit
Memory Organization	2K x 16	2K x 16
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	68-PLCC (J-Lead)	68-PLCC (J-Lead)
Mounting Type	Surface Mount	Surface Mount
Physical Dimensions	24.21 x 24.21 mm	24.21 x 24.21 mm
Product Status	Obsolete	Active
RoHS Compliance	Non-compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The 7143LA20JG is the qualified substitute for the 7143LA35J based on functional and electrical equivalence. Selection between these parts should consider the following factors:

Product Status: The 7143LA35J is obsolete, while the 7143LA20JG maintains active production status. For new designs or long-term system support, the 7143LA20JG is the appropriate choice.

Regulatory Compliance: The 7143LA20JG is ROHS3 compliant, whereas the 7143LA35J is non-compliant. Systems subject to RoHS regulations must use the 7143LA20JG.

Performance Characteristics: The 7143LA20JG provides faster access and write cycle times (20 ns) compared to the 7143LA35J (35 ns). This performance improvement is backward compatible with systems designed for the slower part, as timing margins are typically conservative in legacy designs.

Packaging and Availability: Both parts use identical 68-PLCC packaging with matching physical dimensions, ensuring direct PCB compatibility. The 7143LA20JG has higher inventory availability (1285 units) compared to the 7143LA35J (805 units).

Frequently Asked Questions (FAQ)

Q: Can the 7143LA20JG replace the 7143LA35J in existing equipment?

A: Yes. The 7143LA20JG is functionally equivalent and electrically compatible. It provides identical memory capacity, organization, interface type, voltage requirements, and temperature range. The faster access time is a performance enhancement that does not create compatibility issues.

Q: Are the physical packages identical?

A: Yes. Both parts use the 68-PLCC (J-Lead) package with identical dimensions of 24.21 x 24.21 mm, enabling direct PCB-level substitution without layout modifications.

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

A: The 7143LA20JG is ROHS3 compliant while the 7143LA35J is non-compliant. For applications subject to RoHS regulations or environmental restrictions, the 7143LA20JG must be used.

Q: Does the faster access time of the 7143LA20JG affect system compatibility?

A: No. Faster access time is a performance upgrade. Systems designed for 35 ns access time will operate correctly with 20 ns parts, as timing constraints are satisfied with improved margins.

Q: Are there any differences in moisture sensitivity?

A: No. Both parts have identical MSL ratings of 3 (168 Hours), requiring the same handling and storage protocols.

Q: What are the supply voltage requirements for both parts?

A: Both the 7143LA35J and 7143LA20JG require a supply voltage range of 4.5V to 5.5V and operate across the same temperature range of 0°C to 70°C.

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