Renesas Electronics 71321LA55TFG SRAM Equivalent & Substitute Parts

Part Overview

The Renesas Electronics 71321LA55TFG is an active-status dual-port asynchronous SRAM memory IC with 16Kbit capacity organized as 2K x 8, housed in a 64-TQFP surface mount package. This component is designed for applications requiring parallel memory interface with 55 nanosecond access time and write cycle performance. The part operates within a 4.5V to 5.5V supply voltage range and maintains ROHS3 compliance with MSL-3 moisture sensitivity rating. Substitute parts are identified when equivalent memory specifications, electrical characteristics, and package compatibility are maintained across the product line.

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
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	64-TQFP
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the 71321LA55TFG is determined by strict equivalence across the following critical parameters:

Memory capacity and organization (16Kbit, 2K x 8 configuration)
Dual-port asynchronous SRAM technology
Parallel memory interface architecture
Supply voltage compatibility (4.5V ~ 5.5V range)
Operating temperature range (0°C ~ 70°C)
Surface mount 64-TQFP package format
Compliance certifications (ROHS3, MSL-3)

The 71321LA20PFG qualifies as a direct substitute based on identical memory specifications, electrical operating parameters, package configuration, and regulatory compliance. The primary distinction is improved access time and write cycle performance (20 ns versus 55 ns), which represents a performance enhancement rather than a compatibility limitation.

Parameter Comparison

Parameter	71321LA55TFG	71321LA20PFG
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	20 ns
Write Cycle Time	55 ns	20 ns
Voltage Supply Range	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C
Package Type	64-TQFP	64-TQFP (14x14)
Mounting Type	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)
Product Status	Active	Active

Engineering Selection Recommendations

Both the 71321LA55TFG and 71321LA20PFG maintain active product status with full ROHS3 compliance and identical MSL-3 moisture sensitivity ratings. The 71321LA20PFG provides superior timing performance with 20 nanosecond access and write cycle times compared to the 55 nanosecond specification of the primary part. Selection between these components should be based on circuit timing requirements and application performance specifications. Both parts are electrically and mechanically compatible within systems designed for the 64-TQFP package format and 4.5V to 5.5V supply voltage range.

Frequently Asked Questions (FAQ)

Q: Can the 71321LA20PFG replace the 71321LA55TFG in existing designs?

A: Yes. The 71321LA20PFG is electrically and mechanically compatible. Both parts share identical memory capacity, organization, interface type, supply voltage range, operating temperature range, package format, and compliance certifications. The 71321LA20PFG offers faster access and write cycle times, which is a performance enhancement.

Q: What are the key compatibility criteria for SRAM substitution?

A: Memory capacity (16Kbit), organization (2K x 8), technology (dual-port asynchronous SRAM), interface type (parallel), supply voltage (4.5V ~ 5.5V), operating temperature (0°C ~ 70°C), and package format (64-TQFP surface mount) must remain constant. Compliance certifications (ROHS3, MSL-3) must be maintained.

Q: Are there package dimension differences between these parts?

A: Both parts use 64-TQFP surface mount packages. The 71321LA20PFG specifies 14x14 millimeter dimensions. Verify PCB footprint compatibility with your design specifications.

Q: Do these parts require different handling procedures?

A: Both parts carry MSL-3 moisture sensitivity ratings with 168-hour floor life. Identical moisture control and storage procedures apply to both components.

Q: What is the performance difference between these substitutes?

A: The 71321LA20PFG provides 20 nanosecond access and write cycle times versus 55 nanoseconds for the 71321LA55TFG. This represents a 2.75x performance improvement with no functional or electrical compatibility impact.

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