Equivalent & Substitute Parts: 7204L15PDG

Part Overview

The 7204L15PDG is an asynchronous FIFO (First-In-First-Out) memory circuit manufactured by Renesas Electronics Corporation. This 4K x 9-bit uni-directional device operates at 40MHz with a 15-nanosecond access time and is housed in a 28-pin DIP package. The component is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and legacy system maintenance. Substitute parts must maintain electrical compatibility while accommodating modern packaging and performance requirements.

Key Parameters

Parameter	Value	Unit
Memory Configuration	4K x 9	bits
Function Type	Asynchronous FIFO	—
Data Rate	40	MHz
Access Time	15	ns
Supply Voltage Range	4.5 – 5.5	V
Maximum Supply Current	120	mA
Bus Directionality	Uni-Directional	—
Operating Temperature	0 – 70	°C
Mounting Type	Through Hole	—
Package Type	28-DIP	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the 7204L15PDG is determined by strict equivalence across the following electrical and functional parameters:

Primary Equivalence Criteria:

Memory size: 4K x 9 bits (non-negotiable)
Function: Asynchronous FIFO operation
Bus configuration: Uni-Directional
Supply voltage: 4.5 V – 5.5 V
Operating temperature range: 0°C – 70°C
Retransmit capability: Yes

Secondary Compatibility Factors:

Data rate and access time (substitute may exceed original specifications)
Mounting type and package form factor (may differ from original)
Product status (active status preferred for long-term availability)

The 7204LA12JG meets all primary equivalence criteria while offering improved electrical performance (50MHz data rate, 12ns access time) and active product status. The transition from 28-DIP through-hole to 32-PLCC surface-mount packaging requires PCB redesign considerations but does not affect functional compatibility.

Parameter Comparison

Parameter	7204L15PDG (Original)	7204LA12JG (Substitute)	Compatibility
Memory Configuration	4K x 9	4K x 9	Identical
Function Type	Asynchronous FIFO	Asynchronous FIFO	Identical
Bus Directionality	Uni-Directional	Uni-Directional	Identical
Data Rate	40 MHz	50 MHz	Substitute exceeds specification
Access Time	15 ns	12 ns	Substitute exceeds specification
Supply Voltage Range	4.5 – 5.5 V	4.5 – 5.5 V	Identical
Maximum Supply Current	120 mA	120 mA	Identical
Operating Temperature	0 – 70°C	0 – 70°C	Identical
Retransmit Capability	Yes	Yes	Identical
Mounting Type	Through Hole	Surface Mount	Different
Package Type	28-DIP (0.600", 15.24mm)	32-PLCC (14x11.46mm)	Different
Product Status	Obsolete	Active	Substitute actively supported

Engineering Selection Recommendations

For Legacy System Maintenance: The 7204L15PDG remains functionally viable in existing through-hole PCB designs. Current inventory of 1,148 units supports near-term replacement needs. No electrical redesign is required for direct substitution within the same form factor.

For New Design Implementation: The 7204LA12JG is the designated manufacturer-recommended substitute. Active product status ensures long-term availability and supply chain stability. The 32-PLCC surface-mount package aligns with modern PCB manufacturing standards. Improved electrical performance (50MHz, 12ns) provides design margin without requiring circuit modification. PCB layout redesign is necessary to accommodate the different package footprint and mounting technology.

Voltage and Current Compatibility: Both parts operate within identical supply voltage ranges (4.5 V – 5.5 V) and draw equivalent maximum supply current (120mA). No power supply modifications are required.

Temperature Operating Range: Both parts maintain identical operating temperature specifications (0°C – 70°C), ensuring thermal compatibility in equivalent environmental conditions.

Frequently Asked Questions (FAQ)

Q: Can the 7204LA12JG directly replace the 7204L15PDG on an existing PCB?

A: Electrical substitution is valid; however, physical substitution requires PCB redesign. The 7204L15PDG uses 28-pin DIP through-hole packaging, while the 7204LA12JG uses 32-pin PLCC surface-mount packaging. Pin assignments differ, necessitating layout modification and revalidation.

Q: What is the significance of the improved access time (12ns vs. 15ns) in the substitute part?

A: The 7204LA12JG's 12-nanosecond access time exceeds the original 15-nanosecond specification. This improvement provides faster data retrieval and is backward-compatible with designs requiring 15ns or slower access times. No circuit modification is necessary.

Q: Does the increased data rate (50MHz vs. 40MHz) affect circuit design?

A: The 7204LA12JG's 50MHz data rate exceeds the original 40MHz specification. This improvement is backward-compatible with designs operating at 40MHz or lower frequencies. No circuit modification is required.

Q: Are the pin counts different between these parts?

A: Yes. The 7204L15PDG is a 28-pin DIP device, while the 7204LA12JG is a 32-pin PLCC device. Pin configuration and signal assignments differ. Complete schematic and PCB redesign is required for substitution.

Q: Why is the 7204LA12JG recommended over other potential alternatives?

A: The 7204LA12JG is the manufacturer-recommended substitute designated by Renesas Electronics Corporation. It maintains all critical electrical parameters (memory size, function type, bus configuration, voltage range, temperature range, retransmit capability) while offering improved performance and active product status.

Q: Is the 7204LA12JG suitable for applications requiring the original 28-DIP package?

A: No. The 7204LA12JG uses 32-PLCC surface-mount packaging. For applications requiring through-hole DIP packaging, alternative solutions must be evaluated or the original 7204L15PDG inventory must be utilized.

Q: What is the inventory status of the substitute part?

A: The 7204LA12JG has 676 units in stock as new original inventory, supporting immediate procurement for new designs.

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