Equivalent & Substitute Parts for Renesas 7202LA50LB

Part Overview

The Renesas 7202LA50LB is an asynchronous FIFO memory IC with 1K x 9 bit capacity, designed for bi-directional data buffering applications. This device operates at 15MHz with a 50ns access time and is housed in a 32-LCC surface mount package. The product is classified as obsolete, necessitating identification of functionally compatible alternatives for ongoing system support and new designs.

Substiute Parts

7202LA50LB

Renesas Electronics CorporationIn Stock: 7147202LA50LB Datasheet

Current PartRFQ

7202LA12JG

Renesas Electronics CorporationIn Stock: 12297202LA12JG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 7202LA50LB is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• Memory capacity: 1K x 9 bit configuration
• Function: Asynchronous FIFO operation
• Supply voltage range: 4.5V to 5.5V
• Package type: 32-pin LCC/PLCC surface mount
• Retransmit capability: Required

Performance Parameters: The substitute part 7202LA12JG maintains the same memory configuration and core functionality. While it offers improved performance specifications (12ns access time versus 50ns, 50MHz data rate versus 15MHz), these represent enhancements rather than deviations from the original design intent. The substitute operates within the same voltage supply range and retains retransmit capability.

Operational Differences: The 7202LA12JG operates as a uni-directional bus device, whereas the 7202LA50LB is bi-directional. This represents a functional constraint that must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

The 7202LA12JG is the manufacturer-recommended substitute for the obsolete 7202LA50LB. Both devices share the same base product number (7200 series) and maintain identical memory configuration and core asynchronous FIFO functionality.

Compliance Status:

The 7202LA12JG carries active product status with RoHS3 compliance and REACH unaffected designation, ensuring regulatory alignment for new designs and ongoing procurement. The original 7202LA50LB, classified as obsolete, presents supply chain risk and lacks current compliance documentation.

Performance Considerations:

The substitute part delivers superior performance metrics: 12ns access time (versus 50ns) and 50MHz data rate capability (versus 15MHz). These improvements provide operational headroom for existing applications without requiring design modification.

Critical Constraint:

The bus directional configuration differs between parts. The 7202LA50LB operates bi-directionally, while the 7202LA12JG operates uni-directionally. Applications requiring bi-directional bus operation must evaluate this architectural difference against system requirements.

Package Compatibility:

Both parts use 32-pin surface mount packages with similar physical dimensions (LCC versus PLCC variants). PCB layout modifications may be required due to J-lead versus standard lead geometry differences.

Frequently Asked Questions (FAQ)

Q: Can the 7202LA12JG directly replace the 7202LA50LB without circuit modification?

A: Direct replacement is possible for applications where uni-directional bus operation is acceptable. The identical memory configuration, supply voltage range, and retransmit capability support functional substitution. However, applications requiring bi-directional bus operation require circuit redesign.

Q: What is the significance of the access time difference (50ns versus 12ns)?

A: The 7202LA12JG provides faster data access, which represents an improvement over the original specification. Existing designs operating with 50ns access time will function correctly with the faster substitute part.

Q: Are there package compatibility issues between 32-LCC and 32-PLCC variants?

A: Both packages are 32-pin surface mount devices with comparable footprints. The LCC variant uses J-leads while the PLCC uses gull-wing leads. PCB footprint verification is required before substitution to ensure lead compatibility with existing solder pads.

Q: Why is the operating temperature range different (-55°C to 125°C versus 0°C to 70°C)?

A: The substitute part operates within a narrower temperature range. Applications requiring extended temperature operation below 0°C or above 70°C cannot use the 7202LA12JG as a substitute.

Q: What does "uni-directional" versus "bi-directional" bus mean in practical terms?

A: Bi-directional bus allows data flow in both directions on the same signal lines. Uni-directional bus restricts data flow to one direction. Circuit designs using simultaneous bidirectional data transfer require evaluation before substitution.

Q: Is the 7202LA12JG available in the same packaging as the original part?

A: The 7202LA12JG is supplied in 32-PLCC packaging (14 x 11.46mm) versus the original 32-LCC packaging (13.97 x 11.43mm). Physical dimensions are similar but lead geometry differs, requiring footprint verification.