Equivalent & Substitute Parts for Renesas 7143LA55PF

Part Overview

The Renesas 7143LA55PF is a 32Kbit dual-port asynchronous SRAM with parallel interface, housed in a 100-TQFP package. This component is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production support. The part operates within a 4.5V to 5.5V supply range with an access time of 55 ns and is suitable for applications requiring volatile memory with parallel data access.

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	55 ns
Write Cycle Time	55 ns
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package Type	100-TQFP (14x14)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the 7143LA55PF is determined by the following critical parameters:

Memory Capacity & Organization: Substitute parts must maintain 32Kbit capacity with 2K x 16 organization to ensure functional equivalence
Memory Technology: Dual-port asynchronous SRAM architecture is required for pin-compatible operation
Parallel Interface: The parallel data access method must be preserved
Voltage Supply Range: 4.5V ~ 5.5V compatibility is mandatory
Operating Temperature Range: 0°C ~ 70°C minimum specification required
Access Time: Substitute parts may have equal or faster access times; slower access times are not acceptable

The 7143LA20JG qualifies as a manufacturer-recommended substitute based on these parameters. While it features a different package type (68-PLCC versus 100-TQFP), it maintains all critical electrical and functional specifications, with improved access time performance (20 ns versus 55 ns).

Parameter Comparison

Parameter	7143LA55PF (Main Part)	7143LA20JG (Substitute)
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation
Memory Type	Volatile SRAM	Volatile SRAM
Memory Format	Dual Port, Asynchronous	Dual Port, Asynchronous
Memory Size	32Kbit	32Kbit
Memory Organization	2K x 16	2K x 16
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	Surface Mount	Surface Mount
Package Type	100-TQFP (14x14)	68-PLCC (24.21x24.21)
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

The 7143LA20JG is the manufacturer-recommended substitute for the obsolete 7143LA55PF. Selection of this substitute is supported by the following factors:

Product Status: The 7143LA20JG maintains active product status, ensuring continued availability and manufacturing support
Compliance: The substitute achieves ROHS3 compliance, whereas the original part is non-compliant
Performance: The 7143LA20JG provides superior access and write cycle times (20 ns versus 55 ns), delivering improved performance characteristics
Electrical Compatibility: Both parts operate within identical voltage supply and temperature ranges, ensuring functional compatibility in existing circuit designs
Memory Specifications: Identical memory capacity, organization, and interface specifications guarantee functional equivalence

The primary design consideration is package footprint change from 100-TQFP to 68-PLCC, which requires PCB layout modification.

Frequently Asked Questions (FAQ)

Q: Can the 7143LA20JG directly replace the 7143LA55PF without circuit modification?

A: The 7143LA20JG is electrically compatible and functionally equivalent. However, the package change from 100-TQFP to 68-PLCC requires PCB layout redesign. Pin mapping must be verified against both datasheets to ensure correct signal routing.

Q: What is the significance of the access time difference between these parts?

A: The 7143LA20JG features 20 ns access time compared to the 7143LA55PF's 55 ns. This represents improved performance; the substitute part responds faster to memory access requests. This faster timing is backward-compatible with designs specified for the original part.

Q: Are there any compliance differences between the main part and substitute?

A: Yes. The 7143LA20JG is ROHS3 compliant, while the 7143LA55PF is non-compliant. This compliance improvement may be required for new designs or updated manufacturing standards.

Q: Do both parts share the same moisture sensitivity level?

A: Yes. Both the 7143LA55PF and 7143LA20JG are classified as MSL 3 (168 Hours), requiring identical handling and storage protocols.

Q: What is the base product number relationship between these parts?

A: Both parts share the base product number 7143LA. The suffix designations (55PF and 20JG) indicate specific package and speed grade variants within the same product family.

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