Renesas Electronics 7164L25DB SRAM Equivalent & Substitute Parts

Part Overview

The Renesas Electronics 7164L25DB is a 64Kbit asynchronous SRAM memory IC with parallel interface, organized as 8K x 8, housed in a 28-CDIP package. This component features a 25 ns access time and operates across the industrial temperature range of -55°C to 125°C with a supply voltage range of 4.5V to 5.5V. The 7164L25DB is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new designs.

Substiute Parts

7164L25DB

Renesas Electronics CorporationIn Stock: 1069987164L25DB Datasheet

Current PartRFQ

7164L45DB

Renesas Electronics CorporationIn Stock: 8857164L45DB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 7164L25DB is determined by the following critical parameters:

• Memory capacity (64Kbit) and organization (8K x 8)
• Parallel interface architecture
• Package compatibility (28-CDIP through-hole mounting)
• Supply voltage range (4.5V ~ 5.5V)
• Operating temperature range (-55°C ~ 125°C)
• Access time and write cycle time specifications

The 7164L45DB qualifies as a direct substitute based on matching memory capacity, organization, interface type, package form factor, voltage specifications, and temperature range. The primary difference is the access time specification: 45 ns versus the original 25 ns. This timing difference is acceptable in applications where the slower access time does not violate system timing requirements.

Parameter Comparison

Engineering Selection Recommendations

The 7164L45DB is the designated substitute for the obsolete 7164L25DB. Selection of this alternative is based on:

• Active product status, ensuring ongoing availability and manufacturing support
• Identical memory capacity, organization, and interface specifications
• Identical package form factor and through-hole mounting compatibility
• Matching voltage supply and operating temperature specifications
• Equivalent compliance certifications (RoHS non-compliant, REACH Unaffected)

The 45 ns access and write cycle time of the 7164L45DB represents a performance trade-off compared to the original 25 ns specification. This substitution is valid only for applications where system timing margins accommodate the slower access time without violating critical path requirements.

Frequently Asked Questions (FAQ)

Q: Can the 7164L45DB directly replace the 7164L25DB in existing designs?

A: Direct replacement is possible from a physical and electrical standpoint. The 28-CDIP package dimensions, pinout, voltage requirements, and temperature range are identical. However, the 45 ns access time must be evaluated against system timing requirements. If the original design operated with timing margins that accommodate 45 ns access time, substitution is valid.

Q: What is the primary difference between these two parts?

A: The access time and write cycle time differ: the 7164L25DB operates at 25 ns while the 7164L45DB operates at 45 ns. Both parts are 64Kbit SRAM with 8K x 8 organization in identical 28-CDIP packages.

Q: Are there any compliance or certification differences?

A: Both parts share identical RoHS and REACH compliance status. Neither part is RoHS compliant, and both are REACH Unaffected.

Q: Why is the 7164L25DB classified as obsolete?

A: The 7164L25DB has reached end-of-life status with Renesas Electronics Corporation. The 7164L45DB remains in active production and is the recommended alternative for new designs and legacy system support.

Q: What packaging options are available for the substitute part?

A: The 7164L45DB is supplied in Tube packaging, maintaining the 28-CDIP form factor identical to the original part.