Equivalent & Substitute Parts for Renesas 7207L35LB Asynchronous FIFO

Part Overview

The Renesas 7207L35LB is an asynchronous FIFO memory integrated circuit with 288K capacity (32K x 9 bits) designed for uni-directional data buffering applications. This device operates at 22.22MHz with a 35ns access time and is housed in a 32-LCC surface mount package. The 7207L35LB is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new design implementations.

Substiute Parts

7207L35LB

Renesas Electronics CorporationIn Stock: 9687207L35LB Datasheet

Current PartRFQ

7207LA15JG

Renesas Electronics CorporationIn Stock: 8997207LA15JG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 7207L35LB are identified based on strict equivalence of the following critical parameters:

Memory Architecture & Capacity: The substitute must maintain identical memory organization of 32K × 9 bits (288K total capacity) to ensure pin-level and functional compatibility.

Function Type: The substitute must be an asynchronous FIFO with uni-directional bus configuration, matching the original device's data flow architecture.

Electrical Specifications: Supply voltage range (4.5 – 5.5 V) and bus directionality must be identical. Substitutes may have improved performance characteristics (lower access time, higher data rate, reduced supply current) without compromising backward compatibility.

Package Compatibility: The substitute must be a surface mount device in the 32-pin LCC or PLCC family with compatible pinout and mechanical dimensions suitable for existing PCB layouts.

Product Status Consideration: Active or production-status devices are preferred for long-term availability and supply chain reliability.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: Renesas 7207LA15JG

The 7207LA15JG is the manufacturer-recommended substitute for the obsolete 7207L35LB. This device maintains functional and electrical equivalence across all critical parameters: identical memory capacity (32K × 9), asynchronous FIFO architecture, uni-directional bus configuration, and 4.5 – 5.5 V supply voltage compatibility.

Performance Advantages: The 7207LA15JG provides superior performance with 40 MHz data rate (versus 22.22 MHz) and 15 ns access time (versus 35 ns), enabling direct replacement in existing designs without performance degradation. Supply current is reduced to 120 mA maximum, improving power efficiency.

Product Status: The 7207LA15JG holds active production status, ensuring long-term availability and supply chain continuity compared to the obsolete 7207L35LB.

Package Consideration: The substitute uses 32-PLCC packaging (14 × 11.46 mm) versus the original 32-LCC (13.97 × 11.43 mm). While both are 32-pin surface mount packages with compatible pinouts, PCB footprint verification is required to confirm mechanical fit within existing board layouts.

Temperature Range Limitation: The 7207LA15JG operates over 0 to +70 °C, which is narrower than the original device's −55 to +125 °C range. Applications requiring extended temperature operation below 0 °C or above 70 °C must evaluate alternative solutions or implement thermal management strategies.

Frequently Asked Questions (FAQ)

Q: Can the 7207LA15JG directly replace the 7207L35LB in existing designs?

A: Yes, the 7207LA15JG is functionally equivalent for memory capacity, FIFO architecture, and electrical specifications. However, the package change from 32-LCC to 32-PLCC requires PCB footprint verification. Confirm that the 32-PLCC footprint (14 × 11.46 mm) fits within the existing board layout before implementation.

Q: What are the key differences between these two parts?

A: The primary differences are product status (obsolete versus active), performance metrics (data rate and access time), supply current, operating temperature range, and package type. The 7207LA15JG offers superior performance and lower power consumption but has a narrower temperature operating range.

Q: Is the 7207LA15JG backward compatible with the 7207L35LB?

A: Yes, backward compatibility is maintained for memory organization, function type, bus directionality, and supply voltage. The improved performance characteristics (faster access time, higher data rate) do not compromise compatibility with designs originally specified for the 7207L35LB.

Q: What should I verify before switching to the 7207LA15JG?

A: Verify PCB footprint compatibility for the 32-PLCC package. Confirm that the operating temperature range (0 to +70 °C) meets application requirements. Validate that the reduced maximum supply current (120 mA) is acceptable for power budget calculations.

Q: Why is the operating temperature range narrower for the substitute?

A: The 7207LA15JG is specified for commercial-grade operation (0 to +70 °C), while the original 7207L35LB was rated for military-grade operation (−55 to +125 °C). Applications requiring extended temperature operation must confirm that the substitute's range is sufficient or identify alternative solutions.

Q: Are there any pinout differences between the 7207L35LB and 7207LA15JG?

A: Both devices are 32-pin asynchronous FIFOs with identical functional pinouts. The package type differs (LCC versus PLCC), but pin assignments and signal definitions remain compatible.