Equivalent & Substitute Parts for 7140SA55PF

Part Overview

The 7140SA55PF is an 8Kbit dual-port asynchronous SRAM manufactured by Renesas Electronics Corporation in a 64-TQFP package. This memory IC operates with a 55 ns access time and write cycle time, supporting parallel memory interface with 1K x 8 organization. The part is classified as obsolete, making identification of compatible alternatives essential for ongoing system support and new design implementations. The 7140SA55PF operates within the 4.5V to 5.5V supply voltage range and is rated for 0°C to 70°C operating temperature.

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
Package Type	64-TQFP (14x14)
Mounting Type	Surface Mount
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution compatibility for the 7140SA55PF is determined by the following critical parameters:

Memory capacity (8Kbit) and organization (1K x 8)
Dual-port asynchronous SRAM technology
Parallel memory interface
Package type (64-TQFP with 14x14 dimensions)
Supply voltage compatibility (4.5V ~ 5.5V)
Operating temperature range (0°C ~ 70°C)

The 7140LA25PFG qualifies as a direct substitute because it maintains identical memory capacity, organization, technology, interface type, package configuration, voltage range, and temperature specifications. The primary difference is improved access time and write cycle time performance (25 ns versus 55 ns), which represents a performance upgrade rather than a compatibility limitation.

Parameter Comparison

Parameter	7140SA55PF (Main Part)	7140LA25PFG (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	25 ns
Write Cycle Time	55 ns	25 ns
Voltage Supply Range	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C
Package Type	64-TQFP (14x14)	64-TQFP (14x14)
Mounting Type	Surface Mount	Surface Mount
MSL Rating	3 (168 Hours)	3 (168 Hours)
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The 7140LA25PFG is the qualified substitute for the 7140SA55PF based on the following factors:

The 7140SA55PF is classified as obsolete, creating supply chain risk for ongoing production and field replacements. The 7140LA25PFG maintains active product status with Renesas Electronics Corporation, ensuring continued availability and manufacturing support.

The 7140LA25PFG achieves ROHS3 compliance, whereas the 7140SA55PF is non-compliant. This distinction is significant for applications subject to RoHS regulations and environmental compliance requirements.

Both parts share identical electrical and mechanical specifications across memory capacity, organization, interface type, voltage range, temperature rating, and package configuration. The 7140LA25PFG provides superior performance with 25 ns access and write cycle times compared to the 55 ns specification of the 7140SA55PF. This performance improvement is backward compatible and does not introduce timing constraints in systems designed for the original part.

Frequently Asked Questions (FAQ)

Q: Can the 7140LA25PFG directly replace the 7140SA55PF in existing designs?

A: Yes. Both parts are 8Kbit dual-port asynchronous SRAM devices with identical memory organization (1K x 8), parallel interface, 64-TQFP package configuration, supply voltage range (4.5V ~ 5.5V), and operating temperature range (0°C ~ 70°C). The 7140LA25PFG provides faster access time (25 ns versus 55 ns), which is a performance upgrade and does not create compatibility issues.

Q: What are the key differences between these parts?

A: The primary differences are access time and write cycle time (7140LA25PFG: 25 ns; 7140SA55PF: 55 ns), product status (7140LA25PFG: Active; 7140SA55PF: Obsolete), and RoHS compliance (7140LA25PFG: ROHS3 Compliant; 7140SA55PF: RoHS non-compliant).

Q: Are there any package or pinout differences?

A: No. Both parts use the 64-TQFP (14x14) package with identical pinout and mounting type (surface mount). PCB layout and footprint compatibility is maintained.

Q: Why is the 7140SA55PF obsolete?

A: The 7140SA55PF is classified as obsolete by Renesas Electronics Corporation. The 7140LA25PFG represents the active product line continuation with improved performance characteristics and current manufacturing support.

Q: Does the faster access time of the 7140LA25PFG affect system compatibility?

A: No. Faster access time is a performance enhancement that does not introduce timing violations in systems designed for the original 55 ns specification. All other electrical and mechanical parameters remain identical.

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