Equivalent & Substitute Parts for Renesas 7164S20DB SRAM

Part Overview

The Renesas 7164S20DB is a 64Kbit asynchronous parallel SRAM with 20 ns access time in a 28-CDIP package. This part is classified as obsolete, making substitute components necessary for new designs and ongoing production support. The 7164S20DB operates across an extended temperature range of -55°C to 125°C with supply voltage tolerance of 4.5V to 5.5V, serving applications requiring high-speed volatile memory in through-hole configurations.

Substiute Parts

7164S20DB

Renesas Electronics CorporationIn Stock: 7697164S20DB Datasheet

Current PartRFQ

7164L45DB

Renesas Electronics CorporationIn Stock: 8857164L45DB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 7164S20DB is determined by strict equivalence across the following critical parameters:

• Memory capacity and organization (64Kbit, 8K x 8 configuration)
• Memory interface type (Parallel)
• Package and pinout compatibility (28-CDIP)
• Supply voltage range (4.5V ~ 5.5V)
• Operating temperature range (-55°C ~ 125°C)
• Mounting technology (Through Hole)

The 7164L45DB qualifies as a direct substitute based on identical memory capacity, organization, interface, package, voltage, and temperature specifications. The primary difference is access time and write cycle time, which are relaxed to 45 ns compared to the original 20 ns specification. This relaxation does not prevent substitution in applications where the faster timing is not a functional requirement.

Parameter Comparison

Engineering Selection Recommendations

The 7164L45DB is the qualified substitute for the 7164S20DB based on functional equivalence across all critical electrical and mechanical parameters. The 7164L45DB carries active product status from Renesas Electronics Corporation, ensuring ongoing availability and manufacturing support compared to the obsolete 7164S20DB.

Both parts maintain identical compliance profiles: RoHS non-compliant status and REACH unaffected classification. Moisture sensitivity level remains at MSL 1 (Unlimited) for both components, indicating no special handling requirements during storage or assembly.

Selection between these parts depends solely on timing requirements. The 7164S20DB operates at 20 ns access and write cycle times, while the 7164L45DB operates at 45 ns. Applications with timing-critical paths requiring sub-45 ns memory access cannot use the substitute. Applications with timing margins accommodating 45 ns memory cycles can transition to the 7164L45DB without functional impact.

Frequently Asked Questions (FAQ)

Q: Can the 7164L45DB directly replace the 7164S20DB in existing designs?

A: Direct replacement is possible only if the application timing does not require access times faster than 45 ns. The 7164L45DB is electrically and mechanically compatible with identical pinout, voltage, temperature range, and package specifications. Timing analysis of the specific application circuit is required to confirm compatibility.

Q: Are there any differences in power supply requirements between these parts?

A: No. Both the 7164S20DB and 7164L45DB operate within the identical supply voltage range of 4.5V to 5.5V and support the same operating temperature range of -55°C to 125°C.

Q: What is the significance of the product status difference?

A: The 7164S20DB is classified as obsolete, indicating Renesas has discontinued manufacturing and support. The 7164L45DB maintains active product status, ensuring continued availability, manufacturing support, and technical documentation from Renesas Electronics Corporation.

Q: Are there packaging or mounting differences?

A: No. Both parts use identical 28-CDIP packaging with 0.600" (15.24mm) body dimensions and through-hole mounting technology. PCB layout and assembly processes require no modification.

Q: How do the access time specifications affect circuit performance?

A: Access time determines the maximum speed at which the memory can respond to read requests. The 7164S20DB provides 20 ns access time, while the 7164L45DB provides 45 ns access time. Applications with memory access timing paths exceeding 45 ns will function correctly with the substitute. Applications requiring faster memory response must retain the original 7164S20DB or identify alternative components with faster specifications.