Renesas Electronics 70261S55PF SRAM Equivalent & Substitute Parts

Part Overview

The Renesas Electronics 70261S55PF is a 256Kbit dual-port asynchronous SRAM memory IC in a 100-TQFP surface mount package. This part operates with a 55 ns access time and write cycle time, designed for parallel memory interface applications requiring volatile storage. The 70261S55PF is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations. Substitute parts must maintain identical memory capacity, organization, interface type, and package specifications while meeting current compliance and availability requirements.

Key Parameters

Parameter	Value
Memory Type	Volatile SRAM
Memory Format	Dual Port, Asynchronous
Memory Size	256Kbit
Memory Organization	16K x 16
Memory Interface	Parallel
Access Time	55 ns
Write Cycle Time	55 ns
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	100-TQFP (14x14)
Mounting Type	Surface Mount
Moisture Sensitivity Level	MSL 3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the 70261S55PF is determined by strict equivalence across the following critical parameters:

Memory capacity and organization (256Kbit, 16K x 16 configuration)
Dual-port asynchronous SRAM technology
Parallel memory interface architecture
100-TQFP (14x14) surface mount package
Supply voltage range (4.5V ~ 5.5V)
Operating temperature range (0°C ~ 70°C)
Moisture sensitivity classification (MSL 3)

The 70261L15PFG qualifies as a direct substitute based on full compliance with all mandatory parameters. Performance characteristics such as access time and write cycle time may differ; however, faster access times represent functional improvement without introducing incompatibility. The substitute part maintains identical pinout, package footprint, electrical interface, and environmental specifications required for direct replacement.

Parameter Comparison

Parameter	70261S55PF (Main Part)	70261L15PFG (Substitute)
Memory Type	Volatile SRAM	Volatile SRAM
Memory Format	Dual Port, Asynchronous	Dual Port, Asynchronous
Memory Size	256Kbit	256Kbit
Memory Organization	16K x 16	16K x 16
Memory Interface	Parallel	Parallel
Access Time	55 ns	15 ns
Write Cycle Time	55 ns	15 ns
Voltage Supply Range	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C
Package Type	100-TQFP (14x14)	100-TQFP (14x14)
Mounting Type	Surface Mount	Surface Mount
Moisture Sensitivity Level	MSL 3 (168 Hours)	MSL 3 (168 Hours)
Product Status	Obsolete	Active
RoHS Compliance	Non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The 70261L15PFG is the qualified substitute for the obsolete 70261S55PF. Selection of the substitute part is supported by the following engineering factors:

Product Status: The 70261S55PF is classified as obsolete, creating supply chain risk. The 70261L15PFG maintains active product status with confirmed inventory availability, ensuring long-term procurement viability.

Regulatory Compliance: The 70261L15PFG achieves ROHS3 compliance, meeting current environmental and regulatory requirements. The original 70261S55PF is non-compliant with modern RoHS standards.

Performance Characteristics: The 70261L15PFG provides improved access time (15 ns versus 55 ns) and write cycle time (15 ns versus 55 ns). Faster memory performance is functionally compatible with systems designed for the original part and does not introduce timing violations or operational constraints.

Electrical and Mechanical Compatibility: Both parts maintain identical supply voltage specifications (4.5V ~ 5.5V), operating temperature range (0°C ~ 70°C), package configuration (100-TQFP), and moisture sensitivity classification (MSL 3). Direct PCB-level substitution is supported without design modification.

Frequently Asked Questions (FAQ)

Q: Can the 70261L15PFG replace the 70261S55PF in existing designs?

A: Yes. The 70261L15PFG is a direct substitute. Both parts share identical memory capacity (256Kbit), organization (16K x 16), interface type (parallel dual-port asynchronous SRAM), package footprint (100-TQFP), and electrical specifications (4.5V ~ 5.5V supply, 0°C ~ 70°C operating range). The substitute part requires no PCB modifications or design changes.

Q: What is the primary difference between these parts?

A: The primary difference is access time and write cycle time. The 70261L15PFG operates at 15 ns, compared to 55 ns for the 70261S55PF. This represents improved performance with no compatibility impact. The substitute part also achieves ROHS3 compliance, whereas the original part is non-compliant.

Q: Are there any timing considerations when substituting the 70261L15PFG?

A: No. Faster memory access times do not create timing violations in systems designed for the original 55 ns part. The substitute part meets or exceeds all timing requirements of the original design.

Q: Does the package footprint remain identical?

A: Yes. Both parts use the 100-TQFP (14x14) surface mount package with identical pinout and PCB footprint. No layout modifications are required.

Q: What is the moisture sensitivity level for both parts?

A: Both parts are classified as MSL 3 (168 Hours). Handling, storage, and reflow procedures remain identical between the original and substitute parts.

Q: Is the 70261L15PFG available in the same packaging format?

A: The 70261L15PFG is supplied in Tray packaging, whereas the original part packaging is not specified. Both parts maintain identical component specifications and are suitable for automated assembly processes.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message