Renesas Electronics 7140LA55PF SRAM Equivalent & Substitute Parts

Part Overview

The Renesas Electronics 7140LA55PF is a dual-port asynchronous SRAM memory IC with 8Kbit capacity organized as 1K x 8, housed in a 64-TQFP surface mount package. This component operates at 55 ns access time with a supply voltage range of 4.5V to 5.5V and is rated for 0°C to 70°C operating temperature. The part is currently classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing system support and new design implementations.

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
Supply Voltage	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 eligibility for the 7140LA55PF is determined by strict equivalence across the following critical parameters:

Memory capacity and organization (8Kbit, 1K x 8)
Dual-port asynchronous SRAM technology
Parallel memory interface
64-TQFP (14x14) package footprint and surface mount configuration
Supply voltage compatibility (4.5V ~ 5.5V)
Operating temperature range (0°C ~ 70°C)
Moisture sensitivity level (MSL 3)

The 7140LA25PFG qualifies as a direct substitute based on identical memory capacity, organization, technology, package, voltage, temperature, and MSL specifications. The primary distinction is improved access time performance (25 ns versus 55 ns), which represents a performance upgrade rather than a functional limitation.

Parameter Comparison

Parameter	7140LA55PF (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
Supply Voltage	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C
Package / Case	64-LQFP	64-LQFP
Supplier Device Package	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 obsolete 7140LA55PF. Selection of the 7140LA25PFG provides the following advantages:

Active product status ensures ongoing availability and supply chain continuity
ROHS3 compliance satisfies current environmental and regulatory requirements, whereas the original part is RoHS non-compliant
Faster access time (25 ns) and write cycle time (25 ns) deliver improved system performance without functional compromise
Identical package, pinout, voltage, temperature, and MSL specifications ensure direct PCB compatibility and assembly process compatibility
Both parts share the same base product number (7140LA) and are manufactured by Renesas Electronics Corporation

Frequently Asked Questions (FAQ)

Q: Can the 7140LA25PFG be used as a direct replacement for the 7140LA55PF?

A: Yes. The 7140LA25PFG is functionally equivalent across all critical parameters: memory capacity (8Kbit), organization (1K x 8), technology (dual-port asynchronous SRAM), package (64-TQFP 14x14), supply voltage (4.5V ~ 5.5V), operating temperature (0°C ~ 70°C), and MSL rating (3). The faster access time represents a performance improvement.

Q: Are there any PCB layout or assembly considerations when substituting the 7140LA25PFG?

A: No. Both parts use identical 64-TQFP (14x14) surface mount packages with matching pinouts and footprints. No PCB redesign or assembly process modification is required.

Q: What is the primary reason to transition from the 7140LA55PF to the 7140LA25PFG?

A: The 7140LA55PF is obsolete. The 7140LA25PFG is an active product with current manufacturing support. Additionally, the substitute part is ROHS3 compliant, whereas the original part is RoHS non-compliant.

Q: Are the voltage and temperature specifications identical between these parts?

A: Yes. Both parts operate at 4.5V to 5.5V supply voltage and are rated for 0°C to 70°C operating temperature. No system-level voltage or thermal design changes are necessary.

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

A: No. Faster access time is a performance enhancement that maintains backward compatibility. Systems designed for 55 ns access time will operate correctly with 25 ns access time components.

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