Renesas 7204L35J8 Equivalent & Substitute Parts

Part Overview

The Renesas 7204L35J8 is an asynchronous FIFO (First-In-First-Out) memory circuit with 36K capacity (4K x 9 bits) in a 32-PLCC surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. The 7204L35J8 operates at 22.22MHz with a 35ns access time and is designed for uni-directional data flow applications requiring depth and width expansion capabilities.

Key Parameters

Parameter	Value
Memory Size	36K (4K x 9)
Function	Asynchronous
Data Rate	22.22MHz
Access Time	35ns
Voltage Supply	4.5V ~ 5.5V
Current Supply (Max)	120mA
Bus Directional	Uni-Directional
Package / Case	32-LCC (J-Lead)
Operating Temperature	0°C ~ 70°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 7204L35J8 is determined by strict electrical and mechanical compatibility criteria. The following parameters must remain constant or be compatible:

Memory capacity: 36K (4K x 9) configuration
Function type: Asynchronous FIFO operation
Bus direction: Uni-Directional
Supply voltage range: 4.5V ~ 5.5V
Package type: 32-PLCC (14x11.46mm)
Mounting type: Surface Mount
Operating temperature range: 0°C ~ 70°C

The 7204L12JG8 qualifies as a direct substitute because it maintains identical memory architecture, electrical interface, package footprint, and operating conditions. Performance parameters (data rate and access time) may exceed the original specification, which is acceptable in substitution scenarios.

Parameter Comparison

Parameter	7204L35J8 (Original)	7204L12JG8 (Substitute)	Compatibility
Memory Size	36K (4K x 9)	36K (4K x 9)	Identical
Function	Asynchronous	Asynchronous	Identical
Data Rate	22.22MHz	50MHz	Compatible (higher performance)
Access Time	35ns	12ns	Compatible (faster access)
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	Identical
Current Supply (Max)	120mA	120mA	Identical
Bus Directional	Uni-Directional	Uni-Directional	Identical
Package / Case	32-LCC (J-Lead)	32-LCC (J-Lead)	Identical
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	Identical
Product Status	Obsolete	Active	Substitute is active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Substitute meets current standards

Engineering Selection Recommendations

The 7204L12JG8 is the qualified substitute for the 7204L35J8 based on the following engineering criteria:

Electrical Compatibility: Both components operate within identical voltage supply ranges (4.5V ~ 5.5V) and maximum supply current (120mA), ensuring direct functional replacement without circuit modification.

Memory Architecture: Identical 36K (4K x 9) asynchronous FIFO configuration with uni-directional bus operation maintains data flow compatibility in existing system designs.

Package Compatibility: Both components use 32-PLCC (14x11.46mm) J-Lead surface mount packaging, allowing direct PCB footprint compatibility without layout redesign.

Performance Enhancement: The 7204L12JG8 provides superior performance characteristics (50MHz data rate, 12ns access time) compared to the original specification (22.22MHz, 35ns), making it suitable for applications requiring equal or higher performance.

Compliance Status: The 7204L12JG8 is ROHS3 compliant and carries active product status, whereas the original 7204L35J8 is obsolete and RoHS non-compliant. Selection of the substitute ensures compliance with current environmental and regulatory standards.

Availability: The 7204L12JG8 maintains active inventory status (991 Pcs), providing reliable supply chain availability compared to the obsolete original component.

Frequently Asked Questions (FAQ)

Q: Can the 7204L12JG8 directly replace the 7204L35J8 without PCB modifications?

A: Yes. Both components share identical 32-PLCC (14x11.46mm) J-Lead package footprints and pin configurations. Direct PCB substitution is possible without layout changes.

Q: Are there electrical interface differences between these components?

A: No. Both components operate at 4.5V ~ 5.5V supply voltage with 120mA maximum current draw. Signal levels and timing interfaces are compatible.

Q: Why does the 7204L12JG8 have faster access time and higher data rate?

A: The 7204L12JG8 represents a performance-enhanced version of the same FIFO architecture. The 12ns access time and 50MHz data rate exceed the original 35ns/22.22MHz specification, providing backward compatibility with superior performance margins.

Q: Is the 7204L12JG8 suitable for legacy systems designed for the 7204L35J8?

A: Yes. The substitute maintains identical memory capacity, function type, bus direction, and operating temperature range. Systems designed for the original component will function with the substitute.

Q: What is the significance of RoHS3 compliance on the 7204L12JG8?

A: RoHS3 compliance indicates the substitute meets current environmental and hazardous substance restrictions. The original 7204L35J8 is RoHS non-compliant, making the substitute necessary for applications requiring regulatory compliance.

Q: Are there any moisture sensitivity differences?

A: Yes. The 7204L35J8 has MSL 1 (Unlimited), while the 7204L12JG8 has MSL 3 (168 Hours). The substitute requires standard moisture control during storage and handling per IPC standards.

Q: Can both components be used interchangeably in new designs?

A: Only the 7204L12JG8 should be used in new designs. The 7204L35J8 is obsolete and should be reserved for legacy system maintenance only.

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