Equivalent & Substitute Parts for Renesas 7143SA90J8 SRAM Memory IC

Part Overview

The Renesas 7143SA90J8 is a 32Kbit dual-port asynchronous SRAM memory IC in 68-PLCC surface mount packaging. This part is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing system support and new designs. The 90 ns access time and parallel interface architecture define its operational characteristics within legacy memory applications.

Key Parameters

Parameter	Value
Memory Type	Volatile SRAM
Memory Format	Dual Port, Asynchronous
Memory Size	32Kbit
Memory Organization	2K x 16
Memory Interface	Parallel
Access Time	90 ns
Write Cycle Time	90 ns
Supply Voltage	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	68-PLCC (24.21x24.21)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the 7143SA90J8 is determined by strict parameter matching across the following critical dimensions:

Memory Architecture Compatibility: The substitute must maintain identical memory size (32Kbit), organization (2K x 16), format (dual-port asynchronous SRAM), and interface type (parallel). These parameters define the functional role within the host system.

Electrical Compatibility: Supply voltage range (4.5V ~ 5.5V) and operating temperature range (0°C ~ 70°C) must be identical or broader to ensure drop-in functionality.

Physical Compatibility: Package type (68-PLCC) and mounting method (surface mount) must match to ensure PCB-level compatibility without redesign.

Performance Consideration: Access time and write cycle time may be improved (reduced) without functional impact, as faster devices remain backward compatible with timing-constrained applications.

The 7143LA20JG8 qualifies as a direct substitute based on these criteria, offering improved performance characteristics while maintaining full electrical and mechanical compatibility.

Parameter Comparison

Parameter	7143SA90J8 (Main Part)	7143LA20JG8 (Substitute)	Compatibility
Memory Size	32Kbit	32Kbit	Identical
Memory Organization	2K x 16	2K x 16	Identical
Memory Format	Dual Port, Asynchronous	Dual Port, Asynchronous	Identical
Memory Interface	Parallel	Parallel	Identical
Access Time	90 ns	20 ns	Improved (faster)
Write Cycle Time	90 ns	20 ns	Improved (faster)
Supply Voltage	4.5V ~ 5.5V	4.5V ~ 5.5V	Identical
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	Identical
Package Type	68-PLCC (24.21x24.21)	68-PLCC (24.21x24.21)	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Product Status	Obsolete	Active	Substitute is active
RoHS Compliance	Non-compliant	ROHS3 Compliant	Substitute meets current standards

Engineering Selection Recommendations

The 7143LA20JG8 is the qualified substitute for the obsolete 7143SA90J8. Selection is based on the following engineering criteria:

Functional Equivalence: All memory architecture parameters, electrical specifications, and physical packaging are identical between the main part and substitute, ensuring direct replacement capability.

Product Lifecycle Status: The 7143SA90J8 is obsolete with no active manufacturing. The 7143LA20JG8 is active production, ensuring long-term availability and supply chain continuity.

Regulatory Compliance: The 7143LA20JG8 achieves ROHS3 compliance, meeting current environmental and regulatory requirements. The original part is non-compliant with modern standards.

Performance Enhancement: The 7143LA20JG8 provides superior access time (20 ns versus 90 ns) and write cycle time (20 ns versus 90 ns), delivering improved system performance without design modification.

Packaging and Logistics: Both parts use identical 68-PLCC surface mount packaging. The substitute is available in Tape & Reel format, supporting automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the 7143LA20JG8 directly replace the 7143SA90J8 without PCB modification?

A: Yes. Both parts use identical 68-PLCC packaging with matching pin assignments, electrical specifications, and mechanical dimensions. No PCB redesign is required.

Q: What is the primary reason for substitution?

A: The 7143SA90J8 is obsolete and no longer manufactured. The 7143LA20JG8 is an active production part from the same manufacturer with identical functionality.

Q: Are there timing compatibility concerns when upgrading to the 7143LA20JG8?

A: No. The 7143LA20JG8 has faster access time (20 ns) and write cycle time (20 ns) compared to the original part (90 ns). Faster memory devices are backward compatible with systems designed for slower devices.

Q: Does the 7143LA20JG8 meet current environmental standards?

A: Yes. The 7143LA20JG8 is ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The original 7143SA90J8 is non-compliant.

Q: Are the supply voltage and operating temperature ranges identical?

A: Yes. Both parts operate at 4.5V to 5.5V supply voltage and 0°C to 70°C operating temperature range.

Q: What packaging formats are available for the substitute part?

A: The 7143LA20JG8 is available in Tape & Reel (TR) format, supporting high-volume automated assembly. The original part packaging format is not specified in available data.

Q: Is the memory organization identical between the two parts?

A: Yes. Both parts are organized as 2K x 16 (32Kbit total) dual-port asynchronous SRAM with parallel interface.

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