Renesas Electronics 7133LA55J SRAM Equivalent & Substitute Parts

Part Overview

The Renesas Electronics 7133LA55J is a 32Kbit dual-port asynchronous SRAM memory IC in 68-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 range with a 55 ns access time and is organized as 2K x 16 memory configuration.

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	55 ns
Write Cycle Time	55 ns
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	68-PLCC (J-Lead)
Mounting Type	Surface Mount
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the 7133LA55J is determined by the following critical parameters:

Memory capacity and organization (32Kbit, 2K x 16)
Dual-port asynchronous SRAM technology
Parallel memory interface
68-PLCC package footprint and pinout compatibility
Supply voltage range (4.5V ~ 5.5V)
Operating temperature range (0°C ~ 70°C)
MSL rating (3, 168 Hours)

The 7133LA20JG qualifies as a direct substitute based on identical memory capacity, organization, technology, interface, packaging, voltage specifications, temperature range, and MSL rating. The primary distinction is improved access time performance (20 ns versus 55 ns), which represents a performance upgrade rather than a functional limitation.

Parameter Comparison

Parameter	7133LA55J (Main Part)	7133LA20JG (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	55 ns	20 ns
Write Cycle Time	55 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
MSL Rating	3 (168 Hours)	3 (168 Hours)
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The 7133LA20JG is the qualified substitute for the 7133LA55J based on the following engineering criteria:

Product Status: The 7133LA55J is obsolete, while the 7133LA20JG maintains active product status with confirmed inventory availability (975 pcs in stock). This ensures long-term supply chain viability and manufacturing support.

Compliance and Certifications: The 7133LA20JG achieves ROHS3 compliance, whereas the 7133LA55J is non-compliant. Both parts maintain REACH Unaffected status and EAR99 ECCN classification. For applications requiring regulatory compliance with modern environmental standards, the 7133LA20JG is the appropriate selection.

Performance Characteristics: The 7133LA20JG provides superior access time (20 ns) and write cycle time (20 ns) compared to the original part (55 ns). This performance improvement is backward-compatible with designs specified for the 7133LA55J, as faster memory does not introduce timing violations in systems designed for slower components.

Functional Equivalence: Both parts share identical memory capacity, organization, interface type, packaging, voltage specifications, temperature range, and MSL rating, confirming direct functional substitution capability.

Frequently Asked Questions (FAQ)

Q: Can the 7133LA20JG be used as a direct replacement for the 7133LA55J in existing designs?

A: Yes. The 7133LA20JG is functionally equivalent across all critical parameters: 32Kbit capacity, 2K x 16 organization, dual-port asynchronous SRAM technology, parallel interface, 68-PLCC packaging, 4.5V to 5.5V supply voltage, and 0°C to 70°C operating temperature. The faster access time (20 ns) does not create compatibility issues in systems designed for the 55 ns specification.

Q: What are the key differences between these parts?

A: The primary differences are product status, compliance certification, and performance timing. The 7133LA20JG is an active product with ROHS3 compliance and improved access/write cycle times (20 ns versus 55 ns). The 7133LA55J is obsolete and RoHS non-compliant.

Q: Are the pin configurations identical between these parts?

A: Yes. Both parts use the 68-PLCC (J-Lead) package with identical pinout and footprint (24.21x24.21 mm), enabling direct PCB-level substitution without layout modifications.

Q: What is the MSL rating significance for these components?

A: Both parts carry MSL rating 3 (168 Hours), indicating identical moisture sensitivity levels and requiring equivalent handling and storage protocols during manufacturing and assembly processes.

Q: Why should the 7133LA20JG be selected over the 7133LA55J?

A: The 7133LA20JG should be selected due to active product status, ROHS3 compliance for regulatory requirements, confirmed inventory availability, and superior performance characteristics. The 7133LA55J is obsolete and presents supply chain risk.

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