Renesas Electronics 71321LA55TFG8 SRAM Equivalent & Substitute Parts

Part Overview

The Renesas Electronics 71321LA55TFG8 is a 16Kbit dual-port asynchronous SRAM memory IC in 64-TQFP packaging with 55 ns access time. This part is classified as Last Time Buy, indicating end-of-life status. Equivalent and substitute parts are necessary to ensure design continuity and maintain supply chain reliability for applications requiring 16Kbit parallel SRAM functionality with compatible electrical and mechanical specifications.

Substiute Parts

71321LA55TFG8

Renesas Electronics CorporationIn Stock: 101871321LA55TFG8 Datasheet

Current PartRFQ

71321LA20PFG8

Renesas Electronics CorporationIn Stock: 118171321LA20PFG8 Datasheet

MFR RecommendedRFQ

71321LA20TFG8

Renesas Electronics CorporationIn Stock: 81771321LA20TFG8 Datasheet

MFR RecommendedRFQ

71321LA25PFGI8

Renesas Electronics CorporationIn Stock: 104871321LA25PFGI8 Datasheet

MFR RecommendedRFQ

71321LA25TFGI8

Renesas Electronics CorporationIn Stock: 95271321LA25TFGI8 Datasheet

MFR RecommendedRFQ

71421LA25PFGI8

Renesas Electronics CorporationIn Stock: 120771421LA25PFGI8 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 71321LA55TFG8 is determined by the following critical parameters that must remain constant across all equivalent parts:

Fixed Parameters (Non-Negotiable):

• Memory Size: 16Kbit
• Memory Organization: 2K x 8
• Memory Format: Dual Port, Asynchronous SRAM
• Memory Interface: Parallel
• Supply Voltage: 4.5V ~ 5.5V
• Package / Case: 64-LQFP
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant
• MSL Rating: 3 (168 Hours)

Variable Parameters (Allowed to Differ):

• Access Time / Write Cycle Time: May be faster (20 ns or 25 ns) than the original 55 ns
• Operating Temperature Range: May be extended (-40°C ~ 85°C) from the original 0°C ~ 70°C
• Packaging Format: Tape & Reel (TR) acceptable as alternative to tube
• Base Product Number: 71321LA or 71421LA variants acceptable

Substitute parts must maintain electrical compatibility (voltage, memory capacity, interface type) and mechanical compatibility (package footprint, mounting method) while potentially offering improved performance characteristics or extended temperature ratings.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Recommended for New Designs):

The 71321LA20PFG8 and 71321LA20TFG8 are the preferred substitutes, offering superior performance with 20 ns access time while maintaining the original 0°C ~ 70°C operating temperature range. Both parts are in Active product status, ensuring long-term availability. The 20 ns variants are pin-compatible and functionally superior, providing faster memory access without design modification.

Extended Temperature Alternatives:

The 71321LA25PFGI8, 71321LA25TFGI8, and 71421LA25PFGI8 provide 25 ns access time with extended operating temperature range (-40°C ~ 85°C). These parts are suitable for applications requiring wider temperature operation. The 71421LA25PFGI8 represents a variant base product number but maintains identical electrical and mechanical specifications.

Compatibility Assurance:

All substitute parts maintain ROHS3 compliance and MSL rating 3 (168 Hours), ensuring compatibility with existing manufacturing processes and supply chain requirements. All parts are available in Active product status, guaranteeing supply continuity beyond the Last Time Buy status of the original 71321LA55TFG8.

Frequently Asked Questions (FAQ)

Q: Can I use a faster access time substitute (20 ns or 25 ns) in place of the 55 ns original part?

A: Yes. Faster access time is a performance improvement and does not create compatibility issues. The substitute will operate correctly in any application designed for the original 55 ns part. Timing margins will be improved.

Q: What is the difference between 71321LA and 71421LA base product numbers?

A: Both base product numbers represent Renesas dual-port asynchronous SRAM with identical 16Kbit capacity and 2K x 8 organization. The 71421LA25PFGI8 is functionally equivalent to the 71321LA variants and maintains all critical electrical and mechanical parameters.

Q: Are the different package designations (PFG8 vs. TFG8 vs. PFGI8 vs. TFGI8) interchangeable?

A: All variants use 64-LQFP package with identical pin configuration and footprint. The designations indicate different physical package dimensions (14x14 mm or 10x10 mm) and tape & reel packaging format. Electrical performance and pinout remain identical, making them mechanically and electrically interchangeable on the PCB.

Q: Can I use the extended temperature variants (-40°C ~ 85°C) in applications only requiring 0°C ~ 70°C?

A: Yes. Extended temperature rating is a superset of the original specification. Parts rated for -40°C ~ 85°C will operate correctly in 0°C ~ 70°C environments with no performance degradation.

Q: Is the 71321LA55TFG8 still available for purchase?

A: The 71321LA55TFG8 is classified as Last Time Buy, indicating end-of-life status. Active substitutes (71321LA20PFG8, 71321LA20TFG8, 71321LA25PFGI8, 71321LA25TFGI8, 71421LA25PFGI8) are recommended for new designs and ongoing production to ensure supply continuity.

Q: Do all substitute parts maintain RoHS3 compliance?

A: Yes. All listed substitute parts are ROHS3 compliant with MSL rating 3 (168 Hours), matching the original part's environmental and regulatory compliance status.