Equivalent & Substitute Parts for Renesas 7164L55DB

Part Overview

The Renesas 7164L55DB is a 64Kbit asynchronous SRAM with parallel interface in 28-CDIP packaging. This device is classified as obsolete, making substitute parts necessary for ongoing system support and new designs. The 7164L55DB operates at 55 ns access time with supply voltage range of 4.5V to 5.5V and supports operating temperatures from -55°C to 125°C. Due to its obsolete status, identifying compatible alternatives ensures design continuity and component availability.

Substiute Parts

7164L55DB

Renesas Electronics CorporationIn Stock: 9687164L55DB Datasheet

Current PartRFQ

7164L45DB

Renesas Electronics CorporationIn Stock: 8857164L45DB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 7164L55DB is based on the following critical parameters that must remain constant or improve:

• Memory capacity: 64Kbit (8K x 8 organization)
• Memory type: Asynchronous SRAM with parallel interface
• Package: 28-CDIP through-hole form factor
• Supply voltage: 4.5V ~ 5.5V compatibility
• Operating temperature range: -55°C ~ 125°C
• Access time: Equal to or faster than 55 ns

The substitute part 7164L45DB meets all these criteria. It maintains identical memory capacity, organization, interface type, packaging, voltage specifications, and temperature range. The access time of 45 ns is faster than the original 55 ns specification, making it a direct functional upgrade while maintaining full pin and electrical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The 7164L45DB is the direct substitute for the 7164L55DB based on the following factors:

• Both parts share identical memory specifications (64Kbit, 8K x 8 organization, parallel interface)
• Both maintain the same 28-CDIP through-hole package with identical pinout and mechanical dimensions
• Both operate within the same supply voltage range (4.5V ~ 5.5V) and temperature range (-55°C ~ 125°C)
• The 7164L45DB provides improved performance with 45 ns access time versus 55 ns, ensuring backward compatibility with timing-critical applications
• The 7164L45DB holds active product status with current inventory availability, whereas the 7164L55DB is obsolete
• Both parts share identical RoHS non-compliance status, REACH unaffected classification, and ECCN/HTSUS codes

The 7164L45DB is suitable for direct replacement in existing designs and new applications requiring 64Kbit asynchronous SRAM with parallel interface in 28-CDIP packaging.

Frequently Asked Questions (FAQ)

Q: Can the 7164L45DB replace the 7164L55DB in existing circuit designs?

A: Yes. The 7164L45DB is a direct pin-compatible replacement. Both devices use identical 28-CDIP packaging, pinout, supply voltage (4.5V ~ 5.5V), and operating temperature range (-55°C ~ 125°C). The faster 45 ns access time of the substitute ensures compatibility with designs specified for 55 ns operation.

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 compared to the 7164L55DB at 55 ns. This represents a performance improvement while maintaining full electrical and mechanical compatibility.

Q: Are there any package or mounting differences?

A: No. Both parts use identical 28-CDIP (0.600", 15.24mm) through-hole packaging. PCB layouts and socket compatibility remain unchanged.

Q: Why is the 7164L55DB listed as obsolete?

A: The 7164L55DB has reached end-of-life status. The 7164L45DB is the active equivalent that provides the same functionality with improved performance specifications.

Q: What compliance certifications apply to both parts?

A: Both parts share identical RoHS non-compliance status and REACH unaffected classification. ECCN and HTSUS codes are identical for both devices.