Renesas 7204L25JI Asynchronous FIFO Equivalent & Substitute Parts

Part Overview

The Renesas 7204L25JI is an asynchronous FIFO (First-In-First-Out) memory circuit with 36K capacity (4K x 9 bits) designed for uni-directional data buffering applications. Operating at 28.5MHz with a 25ns access time, this component is housed in a 32-PLCC surface mount package. The 7204L25JI is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations.

Substiute Parts

7204L25JI

Renesas Electronics CorporationIn Stock: 15177204L25JI Datasheet

Current PartRFQ

7204L12JG

Renesas Electronics CorporationIn Stock: 14217204L12JG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 7204L25JI is determined by strict alignment across the following critical parameters:

Memory Architecture: Both parts must maintain identical memory capacity (36K, 4K x 9 configuration) and asynchronous FIFO function to ensure data path compatibility.

Electrical Specifications: Supply voltage range (4.5V ~ 5.5V), maximum supply current (120mA), and uni-directional bus configuration must remain constant across substitutions.

Physical Package: The 32-PLCC (14x11.46mm) surface mount package is mandatory for PCB layout compatibility and pin assignment alignment.

Functional Characteristics: Retransmit capability, expansion type (Depth, Width), and absence of programmable flags and FWFT support must be preserved.

The 7204L12JG qualifies as a direct substitute based on these parameters, with the distinction that it offers enhanced performance characteristics (12ns access time, 50MHz data rate) while maintaining full backward compatibility with the 7204L25JI electrical and mechanical interface.

Parameter Comparison

Engineering Selection Recommendations

The 7204L12JG is the qualified substitute for the obsolete 7204L25JI. Selection between these parts should be based on the following engineering criteria:

For Legacy System Maintenance: The 7204L25JI remains available in inventory (1410 pcs) for direct replacement in existing designs where the original specifications are required and the extended temperature range (-40°C ~ 85°C) is necessary.

For New Designs and Modernization: The 7204L12JG is the preferred choice. It maintains full electrical and mechanical compatibility while offering superior performance (50MHz data rate, 12ns access time) and active product status. The 7204L12JG achieves ROHS3 compliance, addressing environmental and regulatory requirements absent in the obsolete variant.

Temperature Consideration: Applications requiring operation below 0°C or above 70°C must retain the 7204L25JI. The 7204L12JG operating range (0°C ~ 70°C) is narrower and unsuitable for extended temperature environments.

Compliance Requirements: Systems subject to RoHS3 mandates must transition to the 7204L12JG, as the 7204L25JI is non-compliant.

Frequently Asked Questions (FAQ)

Q: Can the 7204L12JG directly replace the 7204L25JI in existing PCB designs?

A: Yes. Both parts share identical memory architecture (36K, 4K x 9), electrical specifications (4.5V ~ 5.5V supply, 120mA max current), and physical packaging (32-PLCC surface mount). Pin assignments and functional behavior are fully compatible. The 7204L12JG provides faster access time and higher data rate as performance enhancements.

Q: What is the primary difference between these two parts?

A: The 7204L12JG offers improved performance specifications (12ns access time versus 25ns, 50MHz data rate versus 28.5MHz) and active product status with ROHS3 compliance. The 7204L25JI provides an extended operating temperature range (-40°C ~ 85°C versus 0°C ~ 70°C).

Q: Are there any pin or package differences?

A: No. Both parts use the identical 32-PLCC (14x11.46mm) J-Lead package with surface mount configuration. PCB footprints and pin assignments are identical.

Q: Why is the 7204L25JI classified as obsolete?

A: The 7204L25JI has been superseded by the 7204L12JG, which offers superior performance and modern compliance certifications. Renesas has transitioned production to the newer variant.

Q: Which part should be selected for new product designs?

A: The 7204L12JG is the appropriate choice for new designs. It provides active product status, ROHS3 compliance, and enhanced performance while maintaining full compatibility with legacy system requirements where applicable.

Q: Does the narrower operating temperature range of the 7204L12JG affect compatibility?

A: Only in applications requiring operation outside the 0°C ~ 70°C range. If your system operates within this temperature window, the 7204L12JG is fully compatible. Systems requiring extended temperature operation must retain the 7204L25JI.