Renesas Electronics 71256L35DB SRAM Equivalent & Substitute Parts

Part Overview

The Renesas Electronics 71256L35DB is a 256Kbit asynchronous SRAM memory IC in 28-CDIP packaging with 35 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 the 4.5V to 5.5V supply range and supports industrial temperature specifications from -55°C to 125°C.

Substiute Parts

71256L35DB

Renesas Electronics CorporationIn Stock: 73671256L35DB 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 71256L35DB is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters for Substitution:

• Memory capacity: 256Kbit
• Memory organization: 32K x 8
• Memory interface: Parallel
• Package type: 28-CDIP
• Voltage supply range: 4.5V ~ 5.5V
• Operating temperature range: -55°C ~ 125°C
• Mounting type: Through Hole
• RoHS compliance: ROHS3 Compliant

Variable Parameter:

• Access time and write cycle time may differ. Substitute parts with equal or faster access times are functionally compatible in applications where timing margins exist.

The 71256L35DB has two qualified substitutes from Renesas Electronics: the 71256L45DB (45 ns access time) and the 71256L70DB (70 ns access time). Both maintain identical memory capacity, organization, packaging, voltage specifications, and temperature range.

Parameter Comparison

Engineering Selection Recommendations

All three parts—71256L35DB, 71256L45DB, and 71256L70DB—are manufactured by Renesas Electronics Corporation and maintain ROHS3 compliance and identical environmental specifications. Selection between these parts depends on application timing requirements:

71256L35DB (35 ns): Use when the original specification requires the fastest access time. This part is the baseline reference.

71256L45DB (45 ns): Use as a substitute when system timing margins accommodate the 10 ns increase in access time. This part has the highest inventory availability (107,090 pcs).

71256L70DB (70 ns): Use as a substitute when system timing margins accommodate the 35 ns increase in access time. This part has limited inventory (2,200 pcs).

All parts share identical packaging, voltage specifications, temperature range, and compliance certifications, ensuring mechanical and electrical compatibility within the stated timing parameters.

Frequently Asked Questions (FAQ)

Q: Can the 71256L45DB replace the 71256L35DB? A: Yes, provided the application timing design accommodates the 45 ns access time specification. The 71256L45DB is electrically and mechanically compatible with identical voltage, temperature, and package specifications.

Q: What is the difference between these substitute parts? A: The primary difference is access time and write cycle time. The 71256L35DB operates at 35 ns, the 71256L45DB at 45 ns, and the 71256L70DB at 70 ns. All other electrical and mechanical parameters are identical.

Q: Are these parts pin-compatible? A: Yes. All three parts use the 28-CDIP package with identical pinout and through-hole mounting configuration.

Q: Do all parts meet the same compliance standards? A: Yes. All three parts are ROHS3 compliant with identical REACH and ECCN classifications.

Q: Which substitute part should I select for a legacy system repair? A: Select based on the original system's timing requirements. If the original design used the 71256L35DB, verify whether the system timing can tolerate slower access times. The 71256L45DB offers the best availability balance.

Q: Are there inventory considerations for part selection? A: Yes. The 71256L45DB has significantly higher inventory (107,090 pcs) compared to the 71256L70DB (2,200 pcs), making it the more readily available substitute option.