Equivalent & Substitute Parts for 7164S35DB

Part Overview

The 7164S35DB is a 64Kbit asynchronous SRAM (Static Random Access Memory) IC manufactured by Renesas Electronics Corporation in a 28-CDIP package. This parallel interface memory device operates with a 35 ns access time and write cycle time, supporting supply voltages from 4.5V to 5.5V across an operating temperature range of -55°C to 125°C. The device is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new designs requiring this memory architecture.

Substiute Parts

7164S35DB

Renesas Electronics CorporationIn Stock: 8927164S35DB Datasheet

Current PartRFQ

7164L45DB

Renesas Electronics CorporationIn Stock: 8857164L45DB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 7164S35DB is determined by strict equivalence across the following critical parameters:

• Memory capacity (64Kbit) and organization (8K x 8)
• Parallel interface architecture
• Supply voltage compatibility (4.5V ~ 5.5V)
• Operating temperature range (-55°C ~ 125°C)
• Physical package (28-CDIP through-hole)
• Manufacturer (Renesas Electronics Corporation)

The 7164L45DB qualifies as a substitute based on matching all mandatory parameters. The primary difference is the access time and write cycle time specification: 45 ns versus the original 35 ns. This represents a slower speed grade within the same product family, making it suitable for applications where the 45 ns timing meets system requirements.

Parameter Comparison

Engineering Selection Recommendations

The 7164L45DB is the designated substitute for the obsolete 7164S35DB. Both devices maintain identical electrical and mechanical specifications with the exception of access and write cycle timing. The 7164L45DB carries active product status from Renesas Electronics Corporation, ensuring continued availability and supply chain support compared to the obsolete 7164S35DB.

Selection of the 7164L45DB requires confirmation that system timing constraints accommodate the 45 ns access time specification. Applications designed for the 35 ns timing of the original part must evaluate whether the 10 ns increase in access time affects overall system performance or timing margins.

Both parts share identical RoHS non-compliance status and REACH unaffected classification, maintaining equivalent regulatory compliance profiles for applications where these certifications apply.

Frequently Asked Questions (FAQ)

Q: Can the 7164L45DB directly replace the 7164S35DB in existing designs?

A: Direct physical replacement is possible due to identical 28-CDIP packaging and through-hole mounting. Functional compatibility depends on system timing requirements. The 7164L45DB operates at 45 ns access time compared to the original 35 ns specification. Systems with timing margins sufficient to accommodate the slower speed grade can use this substitute without modification.

Q: What is the primary reason for substitution?

A: The 7164S35DB is classified as obsolete. The 7164L45DB is an active product from the same manufacturer and product family, providing continued availability for replacement and new production requirements.

Q: Are the supply voltage and operating temperature ranges identical?

A: Yes. Both parts operate across 4.5V to 5.5V supply voltage and -55°C to 125°C operating temperature range, ensuring equivalent environmental performance specifications.

Q: Do both parts use the same package?

A: Yes. Both the 7164S35DB and 7164L45DB use the 28-CDIP package with 0.600" (15.24mm) body dimensions and through-hole mounting, enabling direct physical substitution on PCBs designed for either part.

Q: What is the difference between the 7164S and 7164L designations?

A: The letter designation indicates the speed grade. The "S" in 7164S35DB denotes the faster 35 ns speed grade, while the "L" in 7164L45DB denotes the slower 45 ns speed grade. Both are asynchronous SRAM devices with identical capacity and organization.