Equivalent & Substitute Parts for Renesas 7164S25DB SRAM

Part Overview

The Renesas 7164S25DB is a 64Kbit asynchronous SRAM with parallel interface in 28-CDIP packaging. This part is classified as obsolete, making equivalent substitutes necessary for ongoing system support and new designs. The 7164S25DB operates with 25 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.

Substiute Parts

7164S25DB

Renesas Electronics CorporationIn Stock: 12047164S25DB Datasheet

Current PartRFQ

7164L45DB

Renesas Electronics CorporationIn Stock: 8857164L45DB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 7164S25DB is determined by the following critical parameters that must remain constant or compatible:

• Memory capacity: 64Kbit with 8K x 8 organization
• Memory interface: Parallel interface configuration
• Package type: 28-CDIP form factor with identical pin count and spacing
• Supply voltage range: 4.5V ~ 5.5V compatibility
• Operating temperature range: -55°C ~ 125°C support
• Mounting type: Through hole configuration

The 7164L45DB qualifies as a substitute based on matching all critical parameters. The primary difference is access time and write cycle time specification: 45 ns versus the original 25 ns. This represents a slower speed grade of the same memory device family.

Parameter Comparison

Engineering Selection Recommendations

The 7164L45DB is available as an active product from Renesas Electronics Corporation, whereas the 7164S25DB is obsolete. Both parts maintain identical compliance status with respect to RoHS and REACH regulations. The substitute part provides the same memory capacity, organization, interface type, voltage range, and temperature operating range.

Selection between these parts depends on timing requirements. The 7164S25DB specifies 25 ns access and write cycle times, while the 7164L45DB specifies 45 ns. Applications requiring the faster 25 ns specification cannot use the 7164L45DB as a direct substitute. Applications with timing margins that accommodate 45 ns cycle times can utilize the 7164L45DB for new designs and ongoing support.

Frequently Asked Questions (FAQ)

Q: Can the 7164L45DB replace the 7164S25DB in all applications?

A: The 7164L45DB matches all critical parameters except access time and write cycle time. Substitution is valid only for applications where 45 ns timing meets system requirements. Applications requiring 25 ns performance cannot use this substitute.

Q: Are the packages physically identical?

A: Both parts use 28-CDIP packaging with 0.600" (15.24mm) body dimensions. Pin count and spacing are identical, enabling direct socket compatibility.

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

A: The letter designation indicates speed grade. The "S" in 7164S25DB denotes the faster 25 ns speed grade, while the "L" in 7164L45DB denotes the slower 45 ns speed grade. Both are asynchronous SRAM devices from the same product family.

Q: Are there compliance or regulatory differences between these parts?

A: Both parts share identical RoHS and REACH compliance status. No regulatory differences exist between the two parts.

Q: Why is the 7164S25DB obsolete?

A: The 7164S25DB is classified as obsolete by Renesas Electronics Corporation. The 7164L45DB remains in active production status.