Equivalent & Substitute Parts for R1LP0408DSP-7SI#B0

Part Overview

The R1LP0408DSP-7SI#B0 is a 4Mbit parallel SRAM memory IC manufactured by Renesas Electronics Corporation in a 32-SOP package. This component is classified as Not For New Designs, indicating it has reached end-of-life status. Finding equivalent substitute parts is necessary for legacy system maintenance, repair operations, and continued support of existing installations where this memory IC remains in service.

Key Parameters

Parameter	Value
Memory Size	4Mbit
Memory Organization	512K x 8
Memory Interface	Parallel
Access Time	70 ns
Voltage Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	32-SOIC
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the R1LP0408DSP-7SI#B0 must satisfy the following criteria:

Memory capacity of 4Mbit with 512K x 8 organization
Parallel interface architecture
Access time equal to or faster than 70 ns
Supply voltage range of 4.5V ~ 5.5V
Operating temperature range of -40°C ~ 85°C
32-SOIC package configuration
RoHS3 compliance

The identified substitute parts meet all electrical and mechanical parameters. The primary distinction lies in access time performance and product lifecycle status.

Parameter Comparison

Parameter	R1LP0408DSP-7SI#B0	IS62C5128BL-45QLI	IS62C5128BL-45QLI-TR
Manufacturer	Renesas Electronics	ISSI	ISSI
Memory Size	4Mbit	4Mbit	4Mbit
Memory Organization	512K x 8	512K x 8	512K x 8
Memory Interface	Parallel	Parallel	Parallel
Access Time	70 ns	45 ns	45 ns
Write Cycle Time	70 ns	45 ns	45 ns
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	32-SOIC (11.40mm)	32-SOIC (11.30mm)	32-SOIC (11.30mm)
Product Status	Not For New Designs	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

Both IS62C5128BL-45QLI and IS62C5128BL-45QLI-TR are functionally equivalent substitutes for the R1LP0408DSP-7SI#B0. The ISSI parts offer superior access time performance at 45 ns compared to the original 70 ns specification, providing improved timing margins in legacy system applications.

The IS62C5128BL-45QLI-TR variant includes tape-and-reel packaging, suitable for automated assembly environments. The IS62C5128BL-45QLI is available in standard packaging configurations.

Both substitute parts maintain Active product status, ensuring continued availability and manufacturing support. All three parts carry ROHS3 compliance and identical ECCN and HTSUS classifications, confirming regulatory equivalence.

The 0.1mm difference in package width (11.40mm versus 11.30mm) falls within standard PCB footprint tolerance specifications for 32-SOIC packages and does not present mechanical compatibility issues.

Frequently Asked Questions (FAQ)

Q: Can IS62C5128BL-45QLI parts directly replace R1LP0408DSP-7SI#B0 in existing designs?

A: Yes. Both parts share identical memory capacity, organization, interface type, voltage supply range, and operating temperature specifications. The 32-SOIC package dimensions are within standard tolerance for PCB footprint compatibility. The faster access time of the ISSI parts (45 ns versus 70 ns) improves system timing performance.

Q: What is the difference between IS62C5128BL-45QLI and IS62C5128BL-45QLI-TR?

A: Both parts are electrically identical. The -TR suffix indicates tape-and-reel packaging format, optimized for high-volume automated assembly. The non-TR variant uses standard packaging. Select based on assembly process requirements.

Q: Are there compatibility concerns with the package width difference?

A: No. The 0.1mm difference between the Renesas package (11.40mm) and ISSI package (11.30mm) is within standard PCB footprint tolerance for 32-SOIC components and does not affect mechanical fit or electrical performance.

Q: Why is the original R1LP0408DSP-7SI#B0 marked as Not For New Designs?

A: This designation indicates the part has reached end-of-life status. Existing inventory remains available for legacy system support, but new designs should utilize the active ISSI alternatives.

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

A: Yes. All three parts carry ROHS3 compliance, identical ECCN classification (3A991B2A), and matching HTSUS codes (8542.32.0041), confirming full regulatory equivalence.

Q: What is the significance of the MSL rating difference?

A: The original part carries MSL 1 (unlimited moisture sensitivity level), while ISSI substitutes carry MSL 3 (168 hours). For legacy repair applications, standard moisture control procedures during storage and handling are sufficient to maintain component integrity.

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