Equivalent & Substitute Parts for 7133LA55JI8

Part Overview

The 7133LA55JI8 is a 32Kbit dual-port asynchronous SRAM manufactured by Renesas Electronics Corporation in a 68-PLCC package. This part features a 55 ns access time and parallel memory interface, designed for applications requiring volatile memory with fast read/write cycles. The part is currently obsolete, making substitute components necessary for ongoing system support and new designs. Equivalent parts must maintain identical memory capacity, organization, package form factor, and electrical specifications to ensure direct compatibility.

Key Parameters

Parameter	Value
Memory Type	Volatile SRAM
Memory Format	Dual Port, Asynchronous
Memory Size	32Kbit
Memory Organization	2K x 16
Memory Interface	Parallel
Package / Case	68-LCC (J-Lead)
Supplier Device Package	68-PLCC (24.21x24.21)
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution for the 7133LA55JI8 is based on strict equivalence across the following critical parameters:

Memory capacity and organization (32Kbit, 2K x 16 configuration)
Dual-port asynchronous SRAM technology
Parallel memory interface
68-PLCC package form factor with identical physical dimensions (24.21x24.21)
Supply voltage range (4.5V ~ 5.5V)
Operating temperature range (-40°C ~ 85°C)
Surface mount capability
MSL rating (3, 168 Hours)

The 7133LA25JGI8 qualifies as a direct substitute based on these parameters. Performance characteristics such as access time and write cycle time may differ, but the part maintains full functional and physical compatibility within the specified electrical operating envelope.

Parameter Comparison

Parameter	7133LA55JI8 (Main Part)	7133LA25JGI8 (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	55 ns	25 ns
Write Cycle Time	55 ns	25 ns
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	68-LCC (J-Lead)	68-LCC (J-Lead)
Supplier Device Package	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 Status	RoHS non-compliant	ROHS3 Compliant
Packaging	Bulk	Tape & Reel (TR)

Engineering Selection Recommendations

The 7133LA25JGI8 is the qualified substitute for the obsolete 7133LA55JI8. Selection is based on the following engineering criteria:

Product Status: The 7133LA25JGI8 is active and in production, whereas the 7133LA55JI8 is obsolete. This ensures long-term availability and supply chain continuity.

Compliance: The 7133LA25JGI8 is ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The original part is RoHS non-compliant.

Performance Advantage: The 7133LA25JGI8 provides faster access time (25 ns versus 55 ns) and faster write cycle time (25 ns versus 55 ns), delivering improved performance within the same electrical and physical specifications.

Functional Equivalence: Both parts share identical memory capacity, organization, package dimensions, voltage specifications, and temperature operating range, ensuring direct pin-for-pin and functional compatibility.

Packaging: The 7133LA25JGI8 is supplied in Tape & Reel format, supporting automated assembly processes. The original part is supplied in bulk packaging.

Frequently Asked Questions (FAQ)

Q: Can the 7133LA25JGI8 replace the 7133LA55JI8 in existing designs?

A: Yes. The 7133LA25JGI8 is a direct substitute. Both parts share identical memory capacity (32Kbit), organization (2K x 16), package form factor (68-PLCC, 24.21x24.21), supply voltage range (4.5V ~ 5.5V), and operating temperature range (-40°C ~ 85°C). The substitute part provides faster access and write cycle times, which is compatible with designs specified for the original part.

Q: What are the key differences between these parts?

A: The primary differences are access time (25 ns versus 55 ns), write cycle time (25 ns versus 55 ns), product status (active versus obsolete), RoHS compliance (ROHS3 compliant versus non-compliant), and packaging format (Tape & Reel versus bulk). Functionally and electrically, the parts are equivalent.

Q: Are there any package or pinout differences?

A: No. Both parts use the 68-PLCC package with identical physical dimensions (24.21x24.21 mm) and J-Lead configuration. Pinout and mechanical compatibility are identical.

Q: Does the faster access time of the 7133LA25JGI8 affect system compatibility?

A: No. Faster access time is a performance enhancement that maintains backward compatibility. Systems designed for 55 ns access time will operate correctly with the 25 ns substitute part.

Q: What is the MSL rating for both parts?

A: Both parts have an MSL rating of 3 with a 168-hour moisture sensitivity window. Identical handling and storage requirements apply.

Q: Is the 7133LA25JGI8 available in the same quantities as the original part?

A: Availability differs. The 7133LA25JGI8 is in active production with current inventory. The 7133LA55JI8 is obsolete and no longer manufactured.

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