Equivalent & Substitute Parts for 71V321LA55PF

Part Overview

The 71V321LA55PF is a 16Kbit dual-port asynchronous SRAM manufactured by Renesas Electronics Corporation in a 64-TQFP surface mount package. This part features a 55 ns access time and operates within a 3V to 3.6V supply voltage range. The device is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and component procurement.

Key Parameters

Parameter	Value
Memory Type	Volatile SRAM
Memory Format	Dual Port, Asynchronous
Memory Size	16Kbit
Memory Organization	2K x 8
Memory Interface	Parallel
Access Time	55 ns
Write Cycle Time	55 ns
Supply Voltage	3V to 3.6V
Operating Temperature	0°C to 70°C
Package Type	64-TQFP (14x14)
Mounting Type	Surface Mount
Base Product Number	71V321L

Substitute Part Grouping Explanation

Substitution of the 71V321LA55PF is determined by strict equivalence across the following parameters:

Memory capacity and organization (16Kbit, 2K x 8)
Dual-port asynchronous SRAM technology
Parallel memory interface
Supply voltage range (3V to 3.6V)
Operating temperature range (0°C to 70°C)
Package type and pinout (64-TQFP, 14x14)
Base product number (71V321L)

The 71V321L25PFG meets all substitution criteria. While it features improved access time (25 ns versus 55 ns), this represents a performance upgrade rather than a functional incompatibility. The faster access time is backward compatible with systems designed for the 55 ns specification.

Parameter Comparison

Parameter	71V321LA55PF (Main Part)	71V321L25PFG (Substitute)
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation
Memory Type	Volatile SRAM	Volatile SRAM
Memory Format	Dual Port, Asynchronous	Dual Port, Asynchronous
Memory Size	16Kbit	16Kbit
Memory Organization	2K x 8	2K x 8
Memory Interface	Parallel	Parallel
Access Time	55 ns	25 ns
Write Cycle Time	55 ns	25 ns
Supply Voltage	3V to 3.6V	3V to 3.6V
Operating Temperature	0°C to 70°C	0°C to 70°C
Package Type	64-TQFP (14x14)	64-TQFP (14x14)
Mounting Type	Surface Mount	Surface Mount
Base Product Number	71V321L	71V321L
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

The 71V321L25PFG is the direct substitute for the obsolete 71V321LA55PF. Both parts share identical memory architecture, pinout, and electrical specifications within the 3V to 3.6V operating range.

The 71V321L25PFG offers two significant advantages:

Active product status ensures ongoing availability and manufacturing support
ROHS3 compliance satisfies current environmental and regulatory requirements, whereas the main part is RoHS non-compliant

The faster access time (25 ns) of the substitute part does not create compatibility issues in systems originally designed for 55 ns operation. Timing-critical applications benefit from the improved performance margin.

Frequently Asked Questions (FAQ)

Q: Can the 71V321L25PFG directly replace the 71V321LA55PF without PCB modifications?

A: Yes. Both parts use the 64-TQFP package with identical pinout and footprint. No PCB layout changes are required.

Q: Are there timing considerations when substituting the faster 71V321L25PFG?

A: No. The 25 ns access time is faster than the original 55 ns specification. Systems designed for the slower part operate without timing violations when using the faster substitute.

Q: What is the difference between the 71V321LA55PF and 71V321L25PFG designations?

A: The alphanumeric suffix indicates speed grade and packaging. The "A55" denotes 55 ns access time, while "25" denotes 25 ns access time. Both parts share the base product number 71V321L and are manufactured by Renesas Electronics Corporation.

Q: Is the 71V321L25PFG available in the same packaging options?

A: The 71V321L25PFG is supplied in Tray packaging, while the original part does not specify packaging format. Both use the 64-TQFP (14x14) surface mount package.

Q: Does RoHS compliance affect electrical performance?

A: No. ROHS3 compliance relates to material composition and environmental standards. Electrical characteristics, memory capacity, and interface specifications remain unchanged.

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