Equivalent & Substitute Parts for 709079S12PF

Part Overview

The 709079S12PF is a 256Kbit dual-port synchronous SRAM manufactured by Renesas Electronics Corporation, packaged in a 100-TQFP (14x14mm) surface-mount configuration. This component operates at 12 ns access time with a 4.5V to 5.5V supply voltage range and is rated for 0°C to 70°C operating temperature. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations where legacy compatibility is required.

Key Parameters

Parameter	Value
Memory Type	Volatile SRAM
Memory Format	Dual Port, Synchronous
Memory Size	256Kbit
Memory Organization	32K x 8
Memory Interface	Parallel
Access Time	12 ns
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	100-LQFP
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the 709079S12PF is determined by the following critical parameters:

Memory capacity (256Kbit) and organization (32K x 8)
Dual-port synchronous SRAM architecture
Parallel interface configuration
100-LQFP package footprint and pin compatibility
Surface-mount technology compatibility

The substitute part 70V9079L7PFG meets these core functional requirements. While this substitute exhibits improved performance characteristics (7.5 ns access time versus 12 ns) and operates at a different voltage range (3V to 3.6V), it maintains identical memory capacity, organization, interface type, and physical package dimensions. The faster access time and lower voltage operation represent performance enhancements rather than functional incompatibilities.

Parameter Comparison

Parameter	709079S12PF (Main Part)	70V9079L7PFG (Substitute)
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation
Memory Type	Volatile SRAM	Volatile SRAM
Memory Format	Dual Port, Synchronous	Dual Port, Synchronous
Memory Size	256Kbit	256Kbit
Memory Organization	32K x 8	32K x 8
Memory Interface	Parallel	Parallel
Access Time	12 ns	7.5 ns
Voltage Supply Range	4.5V ~ 5.5V	3V ~ 3.6V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C
Package / Case	100-LQFP	100-LQFP
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

The 70V9079L7PFG is the manufacturer-recommended substitute for the obsolete 709079S12PF. Selection of this alternative is supported by the following factors:

Active product status ensures ongoing availability and manufacturing support
ROHS3 compliance versus non-compliant status of the original part
Identical memory capacity, organization, and interface specifications
Compatible 100-LQFP package footprint and pin configuration
Faster access time (7.5 ns) provides performance margin over the original 12 ns specification

System integration requires evaluation of the voltage supply range difference. The substitute operates at 3V to 3.6V, whereas the original part requires 4.5V to 5.5V. This voltage differential necessitates circuit-level assessment to determine compatibility with existing power distribution architecture.

Frequently Asked Questions (FAQ)

Q: Can the 70V9079L7PFG directly replace the 709079S12PF in existing designs?

A: Physical package compatibility is confirmed through identical 100-LQFP footprints and pin counts. Functional compatibility is established through matching memory capacity (256Kbit), organization (32K x 8), and parallel interface architecture. Voltage supply range differences require circuit evaluation.

Q: What is the significance of the access time difference between 12 ns and 7.5 ns?

A: The substitute part exhibits faster access time, which represents improved performance. Systems designed for 12 ns access time will operate correctly with a 7.5 ns component, as the faster device meets or exceeds timing requirements.

Q: How does the voltage supply range difference affect substitution?

A: The original part operates at 4.5V to 5.5V, while the substitute requires 3V to 3.6V. These ranges do not overlap. System power supply architecture must be evaluated to determine whether the lower voltage requirement of the substitute can be accommodated or if voltage regulation modifications are necessary.

Q: What is the impact of RoHS compliance status?

A: The substitute part is ROHS3 compliant, whereas the original is non-compliant. For applications subject to RoHS regulations or customer requirements, the substitute provides regulatory alignment. For legacy systems without such constraints, this difference is not functionally significant.

Q: Are the moisture sensitivity levels equivalent?

A: Both parts are rated at MSL 3 (168 Hours), indicating identical moisture handling and storage requirements.

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