Equivalent & Substitute Parts for Renesas 7143LA55GB SRAM Memory IC

Part Overview

The Renesas 7143LA55GB is a 32Kbit dual-port asynchronous SRAM memory IC in 68-PGA packaging with 55 ns access time. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing system support and new designs. The part operates across an extended temperature range of -55°C to 125°C and requires a 4.5V to 5.5V supply voltage. Due to its obsolete status, equivalent substitute parts with compatible electrical and mechanical specifications are required for procurement and design continuity.

Substiute Parts

7143LA55GB

Renesas Electronics CorporationIn Stock: 9027143LA55GB Datasheet

Current PartRFQ

7143LA20JG

Renesas Electronics CorporationIn Stock: 13487143LA20JG Datasheet

MFR RecommendedRFQ

7133SA90GB

Renesas Electronics CorporationIn Stock: 8647133SA90GB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 7143LA55GB are identified based on the following critical parameters that determine functional compatibility:

Core Compatibility Criteria:

• Memory size: 32Kbit (fixed requirement)
• Memory organization: 2K x 16 (fixed requirement)
• Memory format: Dual port, asynchronous SRAM (fixed requirement)
• Memory interface: Parallel (fixed requirement)
• Voltage supply range: 4.5V ~ 5.5V (fixed requirement)

Variable Parameters Allowing Substitution:

• Access time: Equal to or faster than 55 ns
• Operating temperature range: Must encompass or match the required range
• Package type: May differ if mechanical constraints permit
• Mounting type: May differ based on PCB design requirements

Two substitute parts meet these criteria with different trade-offs in performance, compliance, and packaging.

Parameter Comparison

Engineering Selection Recommendations

7143LA20JG Selection Criteria: This part is suitable when design requirements permit surface-mount technology and the operating temperature range can be constrained to 0°C to 70°C. The 7143LA20JG offers superior performance with 20 ns access time and is ROHS3 compliant, meeting modern regulatory requirements. However, the reduced temperature range and different package footprint (68-LCC versus 68-BPGA) require PCB redesign. This part is recommended for new designs prioritizing compliance and performance.

7133SA90GB Selection Criteria: This part maintains identical through-hole mounting and extended temperature range (-55°C to 125°C) as the original 7143LA55GB, minimizing PCB modifications. The 7133SA90GB is electrically compatible with identical package dimensions. However, the 90 ns access time is slower than the original specification. This part is recommended for legacy system support where PCB redesign is not feasible and timing margins accommodate the slower access time.

Frequently Asked Questions (FAQ)

Q: Can the 7143LA20JG directly replace the 7143LA55GB on existing PCBs? A: No. The 7143LA20JG uses 68-LCC surface-mount packaging (24.21x24.21) versus the 68-BPGA through-hole package (29.46x29.46) of the original part. PCB redesign is required. Additionally, the operating temperature range is limited to 0°C to 70°C.

Q: Is the 7133SA90GB a pin-compatible replacement? A: Yes. The 7133SA90GB maintains the same 68-BPGA through-hole package and identical footprint (29.46x29.46). No PCB modifications are required. The extended temperature range (-55°C to 125°C) matches the original specification.

Q: What is the impact of the 90 ns access time in the 7133SA90GB compared to the original 55 ns? A: The 7133SA90GB has a 35 ns slower access time. System timing analysis is required to confirm that this slower speed does not violate critical path requirements. If the original design included timing margins, this substitute may be acceptable.

Q: Why does the 7143LA20JG have a different base part number? A: The 7143LA20JG shares the same base product number (7143LA) as the original part, indicating the same memory architecture and organization. The suffix designates packaging, speed grade, and temperature range variants within the same product family.

Q: Are there compliance differences between the substitutes? A: Yes. The 7143LA20JG is ROHS3 compliant, while both the original 7143LA55GB and the 7133SA90GB are RoHS non-compliant. For applications requiring RoHS compliance, only the 7143LA20JG meets this requirement, though PCB redesign is necessary.

Q: What is the MSL (Moisture Sensitivity Level) difference between parts? A: The 7143LA55GB and 7133SA90GB have MSL 1 (unlimited shelf life). The 7143LA20JG has MSL 3, requiring storage in controlled humidity conditions and limiting shelf life to 168 hours after moisture exposure. This affects handling and storage procedures.