Equivalent & Substitute Parts for 72235LB25TF

Part Overview

The Renesas Electronics 72235LB25TF is a Synchronous FIFO Logic IC with 36K memory capacity (2K x 18), designed for uni-directional data buffering applications. This component operates at 40MHz with a 15ns access time and is housed in a 64-TQFP package. The part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. Texas Instruments SN74V235 series components provide direct functional equivalents with enhanced performance characteristics and active product status.

Key Parameters

Parameter	Value
Memory Size	36K (2K x 18)
Function	Synchronous FIFO
Bus Directional	Uni-Directional
Package / Case	64-TQFP (10x10)
Mounting Type	Surface Mount
Operating Temperature	0°C ~ 70°C
Programmable Flags Support	Yes
Expansion Type	Depth, Width
Moisture Sensitivity Level	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the 72235LB25TF is determined by the following mandatory parameters:

Memory capacity of 36K (2K x 18)
Synchronous FIFO function
Uni-directional bus architecture
64-TQFP (10x10) package configuration
Surface mount mounting type
Operating temperature range of 0°C ~ 70°C
Programmable flags support capability
Depth and width expansion capability

The Texas Instruments SN74V235 series satisfies all these core requirements across three speed-grade variants. Substitutes differ in data rate and access time specifications, allowing selection based on application performance requirements. All substitute parts maintain identical memory organization, bus configuration, and physical packaging.

Parameter Comparison

Parameter	72235LB25TF (Original)	SN74V235-7PAG	SN74V235-10PAG	SN74V235-15PAG
Manufacturer	Renesas Electronics	Texas Instruments	Texas Instruments	Texas Instruments
Memory Size	36K (2K x 18)	36K (2K x 18)	36K (2K x 18)	36K (2K x 18)
Function	Synchronous FIFO	Synchronous FIFO	Synchronous FIFO	Synchronous FIFO
Data Rate	40MHz	133MHz	100MHz	66.7MHz
Access Time	15ns	5ns	6.5ns	10ns
Voltage - Supply	4.5 V ~ 5.5 V	3 V ~ 3.6 V	3 V ~ 3.6 V	3 V ~ 3.6 V
Current - Supply (Max)	60mA	35mA	35mA	35mA
Bus Directional	Uni-Directional	Uni-Directional	Uni-Directional	Uni-Directional
Package / Case	64-TQFP	64-TQFP	64-TQFP	64-TQFP
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Programmable Flags Support	Yes	Yes	Yes	Yes
FWFT Support	No	Yes	Yes	Yes
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The 72235LB25TF is obsolete and no longer supported by the manufacturer. All three SN74V235 variants are active products with ROHS3 compliance, ensuring long-term availability and regulatory alignment for new designs.

Selection among the three Texas Instruments substitutes depends on application performance requirements:

SN74V235-7PAG provides the highest performance with 133MHz data rate and 5ns access time, suitable for demanding high-speed buffering applications.

SN74V235-10PAG offers 100MHz data rate and 6.5ns access time, balancing performance and availability with 682 units in stock.

SN74V235-15PAG operates at 66.7MHz with 10ns access time and has the highest inventory level at 932 units, appropriate for moderate-speed applications.

All substitutes operate at lower supply voltages (3V to 3.6V versus 4.5V to 5.5V for the original) and consume less current (35mA maximum versus 60mA), providing improved power efficiency. Circuit design must accommodate the voltage difference through appropriate power supply adjustment or voltage regulation.

Frequently Asked Questions (FAQ)

Q: Can SN74V235 parts directly replace the 72235LB25TF without circuit modifications?

A: Physical and functional compatibility is confirmed for memory organization, bus configuration, and package. However, the supply voltage difference (3V-3.6V versus 4.5V-5.5V) requires power supply circuit adjustment. Pin-level compatibility must be verified against detailed datasheets before implementation.

Q: Which SN74V235 variant should be selected for a legacy system currently using 72235LB25TF?

A: SN74V235-15PAG is the recommended starting point, as its 66.7MHz data rate and 10ns access time most closely match the original 40MHz/15ns specification. This minimizes design risk while providing active product status and ROHS3 compliance.

Q: Are all three SN74V235 variants pin-compatible with the 72235LB25TF?

A: All three variants share identical 64-TQFP packaging and memory organization. Pin compatibility is determined by functional equivalence within the FIFO architecture. Detailed pinout verification against manufacturer datasheets is required before board-level substitution.

Q: What is the impact of FWFT (First Word Fall Through) support on substitution?

A: The original 72235LB25TF does not support FWFT, while all SN74V235 variants do. This additional capability in substitutes does not prevent compatibility but may require firmware or timing adjustments if the original design specifically avoided FWFT operation.

Q: How does the lower supply voltage of SN74V235 parts affect system integration?

A: The 3V-3.6V supply requirement versus the original 4.5V-5.5V necessitates dedicated voltage regulation or power supply redesign. Current consumption is reduced (35mA maximum versus 60mA), improving overall system power efficiency.

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