Equivalent & Substitute Parts for Renesas 7164S55DB SRAM

Part Overview

The Renesas 7164S55DB is a 64Kbit asynchronous SRAM with parallel interface in 28-CDIP packaging. This part is classified as obsolete, making substitute identification necessary for ongoing system support and component procurement. The 7164S55DB operates with 55 ns access time and is designed for applications requiring volatile memory with through-hole mounting.

Substiute Parts

7164S55DB

Renesas Electronics CorporationIn Stock: 11957164S55DB Datasheet

Current PartRFQ

7164L45DB

Renesas Electronics CorporationIn Stock: 8857164L45DB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 7164S55DB is determined by the following critical parameters:

• Memory capacity: 64Kbit with 8K x 8 organization
• Interface type: Parallel asynchronous SRAM
• Package compatibility: 28-CDIP through-hole form factor
• Voltage specification: 4.5V ~ 5.5V supply range
• Temperature range: -55°C ~ 125°C operation
• Access time: Equal to or faster than 55 ns

The 7164L45DB qualifies as a direct substitute based on matching memory capacity, organization, interface, package, voltage, and temperature specifications. The 7164L45DB provides improved performance with 45 ns access time, which is faster than the original 55 ns specification while maintaining full electrical and mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The 7164L45DB is the qualified substitute for the 7164S55DB. Selection is based on the following factors:

• The 7164S55DB is obsolete, whereas the 7164L45DB maintains active product status, ensuring continued availability and supply chain reliability.
• Both parts share identical electrical specifications for memory capacity, organization, interface, voltage, and temperature range.
• Both parts use the same 28-CDIP through-hole package, enabling direct board-level replacement without layout modifications.
• The 7164L45DB provides superior performance with 45 ns access and write cycle times compared to the 55 ns specification of the original part.
• Both parts carry identical RoHS non-compliance and MSL ratings, maintaining consistency in compliance posture.
• Both parts are manufactured by Renesas Electronics Corporation, ensuring consistent quality and reliability standards.

Frequently Asked Questions (FAQ)

Q: Can the 7164L45DB directly replace the 7164S55DB in existing designs?

A: Yes. The 7164L45DB is electrically and mechanically compatible with the 7164S55DB. Both parts feature identical memory capacity, organization, parallel interface, supply voltage range, operating temperature range, and 28-CDIP package dimensions. No circuit modifications or board redesign is required.

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

A: The primary difference is access time and write cycle time. The 7164L45DB operates at 45 ns, while the 7164S55DB operates at 55 ns. The faster 7164L45DB will not cause timing violations in systems designed for the slower 7164S55DB.

Q: Why is the 7164S55DB listed as obsolete?

A: The 7164S55DB has reached end-of-life status with Renesas Electronics Corporation. The 7164L45DB represents the active alternative from the same manufacturer for continued system support.

Q: Are there any compliance differences between these parts?

A: Both parts share identical RoHS non-compliance status and MSL rating of 1 (Unlimited). No compliance adjustments are necessary when substituting between these parts.

Q: Is the 28-CDIP package still available for new designs?

A: The 7164L45DB is available in 28-CDIP through-hole packaging with active product status, confirming continued package availability from Renesas Electronics Corporation.