Renesas Electronics 7130LA55C SRAM Equivalent & Substitute Parts

Part Overview

The 7130LA55C is an 8Kbit dual-port asynchronous SRAM manufactured by Renesas Electronics Corporation. This parallel interface memory device operates with a 55 ns access time and write cycle time, designed for through-hole mounting in 48-DIP packaging. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for system redesign, legacy equipment maintenance, and production continuity. Substitute parts must maintain core electrical specifications including memory capacity, interface type, voltage supply range, and operating temperature while accommodating packaging and performance variations.

Key Parameters

Parameter	Value
Memory Type	Volatile SRAM
Memory Format	Dual Port, Asynchronous
Memory Size	8Kbit
Memory Organization	1K x 8
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
Mounting Type	Through Hole
Package	48-DIP (0.600", 15.24mm)

Substitute Part Grouping Explanation

Substitution eligibility for the 7130LA55C is determined by the following mandatory parameters:

Memory capacity: 8Kbit minimum
Memory organization: 1K x 8 configuration
Interface type: Parallel
Voltage supply: 4.5V ~ 5.5V compatibility
Operating temperature range: 0°C ~ 70°C minimum coverage
Technology: SRAM dual-port asynchronous

The 7130LA20JG qualifies as a functional substitute based on matching memory size, organization, interface type, voltage supply range, and operating temperature. This part shares the same base product number (7130LA) and manufacturer, confirming design compatibility. Differences in access time (20 ns versus 55 ns) and packaging (52-PLCC surface mount versus 48-DIP through hole) represent performance improvements and form factor changes that do not prevent substitution in applications where the circuit board layout can accommodate surface-mount technology.

Parameter Comparison

Parameter	7130LA55C (Main Part)	7130LA20JG (Substitute)
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation
Memory Type	Volatile SRAM	Volatile SRAM
Memory Format	Dual Port, Asynchronous	Dual Port, Asynchronous
Memory Size	8Kbit	8Kbit
Memory Organization	1K x 8	1K x 8
Memory Interface	Parallel	Parallel
Access Time	55 ns	20 ns
Write Cycle Time	55 ns	20 ns
Voltage Supply Range	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C
Mounting Type	Through Hole	Surface Mount
Package	48-DIP (0.600", 15.24mm)	52-LCC (J-Lead)
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The 7130LA20JG is the primary substitute for the obsolete 7130LA55C. Selection of this alternative is justified on the following engineering grounds:

Product Status: The 7130LA55C is obsolete, while the 7130LA20JG maintains active production status, ensuring long-term availability and supply chain stability.

Electrical Compatibility: Both parts operate within identical voltage supply ranges (4.5V ~ 5.5V) and temperature ranges (0°C ~ 70°C), confirming functional interchangeability in existing circuit designs.

Memory Specifications: Matching 8Kbit capacity and 1K x 8 organization preserve data storage and addressing architecture without modification to firmware or software.

Performance Enhancement: The 7130LA20JG provides faster access and write cycle times (20 ns versus 55 ns), delivering improved system performance without degradation risk.

Compliance Improvement: The 7130LA20JG achieves ROHS3 compliance, addressing environmental and regulatory requirements that the non-compliant 7130LA55C does not meet.

Packaging Consideration: Substitution requires circuit board redesign to accommodate surface-mount 52-LCC packaging in place of through-hole 48-DIP. This represents a design change requiring PCB layout modification and assembly process adjustment.

Frequently Asked Questions (FAQ)

Q: Can the 7130LA20JG directly replace the 7130LA55C without circuit modification?

A: Electrical and functional compatibility is confirmed. However, packaging differs fundamentally: the 7130LA55C uses through-hole 48-DIP mounting, while the 7130LA20JG requires surface-mount 52-LCC (J-Lead) placement. Direct socket substitution is not possible. Circuit board redesign and assembly process changes are necessary.

Q: What are the key parameters that determine substitution eligibility?

A: Substitution requires matching memory capacity (8Kbit), organization (1K x 8), interface type (parallel), voltage supply range (4.5V ~ 5.5V), and operating temperature coverage (0°C ~ 70°C minimum). Both parts meet these criteria as members of the 7130LA product family.

Q: Does the faster access time of the 7130LA20JG create compatibility issues?

A: No. The 7130LA20JG's 20 ns access and write cycle times are faster than the 7130LA55C's 55 ns specification. Faster memory improves system performance and does not introduce timing violations in circuits designed for the slower original part.

Q: What compliance differences exist between these parts?

A: The 7130LA55C is RoHS non-compliant. The 7130LA20JG achieves ROHS3 compliance, meeting current environmental and regulatory standards for electronic components in regulated markets.

Q: Are there additional substitute options beyond the 7130LA20JG?

A: The 7130LA20JG is listed as the manufacturer-recommended substitute. The 7130LA20JG documentation references additional substitutes (7130LA25JGI, 7140LA20JG), which may provide alternative packaging or performance options within the Renesas 7130LA/7140LA product families.

Q: What inventory status should be considered for production planning?

A: The 7130LA55C shows 763 pieces in stock as new original inventory. The 7130LA20JG maintains 868 pieces in active stock. For new designs or production transitions, the 7130LA20JG's active product status ensures ongoing availability, while the 7130LA55C's obsolete classification limits future sourcing options.

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