Renesas Electronics 71256L25DB SRAM Equivalent & Substitute Parts

Part Overview

The Renesas Electronics 71256L25DB is a 256Kbit asynchronous SRAM memory IC in 28-CDIP packaging with 25 ns access time. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support, maintenance, and legacy equipment repairs. The part operates within a 4.5V to 5.5V supply range and supports industrial temperature specifications from -55°C to 125°C.

Substiute Parts

71256L25DB

Renesas Electronics CorporationIn Stock: 95771256L25DB Datasheet

Current PartRFQ

71256L45DB

Renesas Electronics CorporationIn Stock: 10718271256L45DB Datasheet

MFR RecommendedRFQ

71256L70DB

Renesas Electronics CorporationIn Stock: 225271256L70DB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 71256L25DB is determined by strict equivalence in the following parameters:

• Memory capacity: 256Kbit
• Memory organization: 32K x 8 parallel interface
• Package type: 28-CDIP through-hole mounting
• Supply voltage range: 4.5V ~ 5.5V
• Operating temperature range: -55°C ~ 125°C
• Compliance certifications: ROHS3, REACH Unaffected

The substitute parts listed below maintain identical electrical and mechanical specifications with the exception of access time and write cycle time. These timing parameters are relaxed (slower) in the substitutes, making them suitable for applications where the original 25 ns specification is not a hard requirement.

Parameter Comparison

Engineering Selection Recommendations

All three parts—71256L25DB, 71256L45DB, and 71256L70DB—share identical compliance certifications (ROHS3 Compliant, REACH Unaffected) and regulatory classifications (ECCN 3A001A2C, HTSUS 8542.32.0041). Selection between these parts depends solely on system timing requirements:

• 71256L25DB: 25 ns access time. Use when system timing specifications require the fastest memory response.
• 71256L45DB: 45 ns access time. Use when system timing tolerates moderate latency.
• 71256L70DB: 70 ns access time. Use when system timing accommodates the slowest response specification.

All parts are through-hole mounted in identical 28-CDIP packages and operate within the same voltage and temperature ranges, ensuring direct mechanical and electrical interchangeability within the timing constraints of the application.

Frequently Asked Questions (FAQ)

Q: Can 71256L45DB or 71256L70DB be used as direct replacements for 71256L25DB?

A: Yes, provided the application timing specifications do not require 25 ns access time. Both substitute parts are electrically and mechanically identical except for access time and write cycle time, which are relaxed (slower) in the substitutes.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the 28-CDIP package with identical pinout and through-hole mounting, enabling direct socket replacement.

Q: Do the substitute parts meet the same compliance standards?

A: Yes. All three parts are ROHS3 Compliant and REACH Unaffected, with identical regulatory classifications.

Q: What is the difference between the three parts?

A: The only difference is access time and write cycle time. The 71256L25DB operates at 25 ns, the 71256L45DB at 45 ns, and the 71256L70DB at 70 ns. All other electrical and mechanical specifications are identical.

Q: Can slower parts be used in place of faster parts?

A: Slower parts can be used only if the system design accommodates the increased latency. System timing analysis is required to confirm compatibility.

Q: Are these parts still in production?

A: All three parts are classified as obsolete. Availability is limited to existing inventory from authorized distributors.