Renesas Electronics 7008S55G SRAM Equivalent & Substitute Parts

Part Overview

The Renesas Electronics 7008S55G is a 512Kbit dual-port asynchronous SRAM with parallel interface, organized as 64K x 8 bits. This through-hole mounted component operates at 55 ns access time and write cycle time, with supply voltage range of 4.5V to 5.5V and operating temperature range of 0°C to 70°C. The device is classified as obsolete, making substitute parts necessary for new designs and ongoing production support.

Substiute Parts

7008S55G

Renesas Electronics CorporationIn Stock: 9247008S55G Datasheet

Current PartRFQ

7008L20PFGI

Renesas Electronics CorporationIn Stock: 8267008L20PFGI Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 7008S55G is based on the following critical parameters that must remain compatible:

• Memory capacity: 512Kbit maintained
• Memory organization: 64K x 8 bit structure preserved
• Memory technology: Dual-port asynchronous SRAM required
• Parallel interface: Maintained for signal compatibility
• Supply voltage: 4.5V to 5.5V range supported
• Pin count and functional pinout: Electrical equivalence required

The substitute part 7008L20PFGI meets these core functional requirements while offering improved performance characteristics and modern packaging options.

Parameter Comparison

Engineering Selection Recommendations

The 7008L20PFGI serves as a functional substitute for the obsolete 7008S55G based on electrical equivalence in memory capacity, organization, interface type, and supply voltage compatibility. The substitute part offers the following advantages:

• Active product status ensures ongoing availability and manufacturing support
• ROHS3 compliance meets current environmental and regulatory requirements
• Improved access and write cycle times (20 ns versus 55 ns) provide performance enhancement
• Extended operating temperature range (-40°C to 85°C) supports broader application environments
• Surface mount packaging enables modern PCB assembly processes

Component selection should account for physical package differences. The 7008S55G uses through-hole 84-BPGA mounting, while the 7008L20PFGI requires surface mount 100-LQFP footprint. PCB redesign is necessary to accommodate the different package type and pin count.

Frequently Asked Questions (FAQ)

Q: Can the 7008L20PFGI directly replace the 7008S55G without circuit modification?

A: Electrical substitution is possible due to matching memory capacity, organization, interface type, and supply voltage range. However, physical package differences (84-BPGA through-hole versus 100-LQFP surface mount) require PCB redesign and layout changes.

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

A: Memory size, organization, interface type, supply voltage range, and functional pinout must match. The 7008L20PFGI maintains these parameters with the 7008S55G.

Q: Does the faster access time of the 7008L20PFGI affect circuit operation?

A: The 20 ns access time of the substitute part is faster than the original 55 ns specification. This improvement is backward compatible and does not create timing violations in circuits designed for the slower original part.

Q: What is the significance of the RoHS compliance difference?

A: The 7008S55G is RoHS non-compliant, while the 7008L20PFGI is ROHS3 compliant. For new designs and applications subject to environmental regulations, the compliant substitute part is required.

Q: Are there pin count differences between these parts?

A: Yes. The 7008S55G uses 84 pins in BPGA package, while the 7008L20PFGI uses 100 pins in LQFP package. Functional pinout mapping is required during circuit redesign.