Equivalent & Substitute Parts for 7133SA35J

Part Overview

The 7133SA35J 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 product is classified as obsolete, making identification of compatible substitute parts 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	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	68-PLCC (24.21x24.21)
Mounting Type	Surface Mount
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the 7133SA35J is determined by strict equivalence in the following critical parameters:

Memory size and organization (32Kbit, 2K x 16 configuration)
Memory type and technology (Dual Port, Asynchronous SRAM)
Memory interface (Parallel)
Package and pinout (68-PLCC with identical physical dimensions)
Voltage supply range (4.5V ~ 5.5V compatibility)
Operating temperature range (0°C ~ 70°C)
Moisture sensitivity level (MSL 3)

The 7133LA20JG qualifies as a direct substitute based on these parameters. While the substitute part features improved access time and write cycle time specifications (20 ns versus 35 ns), this represents a performance enhancement rather than a functional incompatibility. The faster timing characteristics ensure backward compatibility with systems designed for the original 35 ns part.

Parameter Comparison

Parameter	7133SA35J (Original)	7133LA20JG (Substitute)
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation
Memory Size	32Kbit	32Kbit
Memory Organization	2K x 16	2K x 16
Memory Type	Dual Port, Asynchronous SRAM	Dual Port, Asynchronous SRAM
Memory Interface	Parallel	Parallel
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	68-PLCC (24.21x24.21)	68-PLCC (24.21x24.21)
Mounting Type	Surface Mount	Surface Mount
MSL Rating	3 (168 Hours)	3 (168 Hours)
Product Status	Obsolete	Active
RoHS Compliance	Non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The 7133LA20JG is the qualified substitute for the obsolete 7133SA35J based on functional and electrical equivalence. Selection of the substitute part is supported by the following factors:

The original 7133SA35J is classified as obsolete, creating supply chain risk for ongoing system support and repair operations. The 7133LA20JG maintains active product status with confirmed inventory availability, ensuring long-term procurement viability.

The substitute part achieves ROHS3 compliance, whereas the original part is non-compliant. This compliance improvement aligns with current environmental and regulatory standards applicable to electronic component manufacturing and distribution.

Both parts share identical memory capacity, organization, interface type, package configuration, and electrical operating parameters. The 20 ns timing specification of the substitute part represents a performance improvement that maintains full backward compatibility with systems originally designed for 35 ns operation.

Frequently Asked Questions (FAQ)

Q: Can the 7133LA20JG directly replace the 7133SA35J in existing circuit designs?

A: Yes. The 7133LA20JG is functionally equivalent to the 7133SA35J. Both parts feature identical memory capacity (32Kbit), organization (2K x 16), package type (68-PLCC), pinout, voltage supply range (4.5V ~ 5.5V), and operating temperature range (0°C ~ 70°C). The improved access time and write cycle time of the substitute part (20 ns) ensure compatibility with systems designed for the original 35 ns specification.

Q: Are there any package or pinout differences between these parts?

A: No. Both the 7133SA35J and 7133LA20JG use identical 68-PLCC packaging with surface mount configuration and matching physical dimensions (24.21x24.21 mm). Pinout compatibility is maintained across both parts.

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

A: The 7133SA35J is RoHS non-compliant, while the 7133LA20JG is ROHS3 compliant. For new designs or systems subject to environmental regulations, the ROHS3-compliant substitute part is the appropriate selection. For legacy system repairs where the original part specification is required, compliance status does not affect functional compatibility.

Q: How do the timing specifications affect system performance?

A: The 7133LA20JG operates with 20 ns access and write cycle times compared to 35 ns for the 7133SA35J. This represents a performance enhancement. Systems designed for 35 ns operation will function correctly with the faster 20 ns part, as the substitute meets or exceeds all timing requirements of the original specification.

Q: Are both parts suitable for the same operating temperature range?

A: Yes. Both parts operate across the identical temperature range of 0°C to 70°C (TA), ensuring thermal compatibility in equivalent system environments.

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