Equivalent & Substitute Parts for 7133LA55JI

Part Overview

The 7133LA55JI is a 32Kbit dual-port asynchronous SRAM manufactured by Renesas Electronics Corporation in a 68-PLCC surface mount package. This component features a 55 ns access time and parallel memory interface, designed for applications requiring volatile memory with dual-port architecture. The part is classified as obsolete, making identification of compatible substitutes essential for ongoing system support and component procurement.

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
Package Type	68-PLCC (24.21x24.21)
Voltage Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the 7133LA55JI is determined by strict equivalence across the following critical parameters:

Memory capacity and organization (32Kbit, 2K x 16)
Dual-port asynchronous SRAM architecture
Parallel memory interface
68-PLCC package footprint and pinout compatibility
Supply voltage range (4.5V ~ 5.5V)
Operating temperature range (-40°C ~ 85°C)

The 7133LA25JGI qualifies as a direct substitute based on identical memory specifications, package, voltage, and temperature ratings. The primary difference is improved access time performance (25 ns versus 55 ns), which represents a performance upgrade rather than a functional limitation.

Parameter Comparison

Parameter	7133LA55JI (Main Part)	7133LA25JGI (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	25 ns
Write Cycle Time	55 ns	25 ns
Package Type	68-PLCC (24.21x24.21)	68-PLCC (24.21x24.21)
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Status	Non-compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

The 7133LA25JGI is the qualified substitute for the 7133LA55JI based on the following factors:

Functional Compatibility: Both parts share identical memory architecture, capacity, organization, and interface specifications. The 68-PLCC package footprint and pinout are equivalent, enabling direct board-level replacement without layout modifications.

Performance Upgrade: The 7133LA25JGI provides faster access and write cycle times (25 ns versus 55 ns). This performance improvement is backward-compatible with designs specified for the 7133LA55JI, as timing-critical applications will benefit from reduced memory latency.

Product Status and Compliance: The 7133LA55JI is obsolete, while the 7133LA25JGI maintains active production status, ensuring long-term availability. The substitute achieves ROHS3 compliance and REACH unaffected status, meeting modern regulatory requirements that the original part does not satisfy.

Moisture Sensitivity: Both parts carry identical MSL ratings (3, 168 hours), requiring equivalent handling and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can the 7133LA25JGI replace the 7133LA55JI in existing designs?

A: Yes. The 7133LA25JGI is functionally equivalent across all critical parameters: memory capacity, organization, interface type, package footprint, voltage supply, and operating temperature range. Direct substitution is supported without circuit modifications.

Q: What is the primary difference between these parts?

A: Access time and write cycle time. The 7133LA25JGI operates at 25 ns compared to the 7133LA55JI at 55 ns. This represents a performance improvement that is fully backward-compatible with designs specified for the slower part.

Q: Are the packages physically identical?

A: Yes. Both parts use the 68-PLCC package with identical dimensions (24.21x24.21 mm) and J-lead configuration. PCB footprints and pinouts are equivalent.

Q: Does the 7133LA25JGI meet current compliance standards?

A: Yes. The 7133LA25JGI is ROHS3 compliant and REACH unaffected, whereas the 7133LA55JI is non-compliant. For new designs or systems requiring regulatory compliance, the substitute is the appropriate choice.

Q: Are there any voltage or temperature limitations when substituting?

A: No. Both parts operate across the identical voltage range (4.5V ~ 5.5V) and temperature range (-40°C ~ 85°C). No power supply or thermal management modifications are required.

Q: What is the MSL rating, and does it affect substitution?

A: Both parts carry MSL 3 (168 hours). Identical moisture sensitivity levels mean equivalent handling, storage, and reflow requirements apply to both components.

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