Equivalent & Substitute Parts for 71024S12YGI

Part Overview

The 71024S12YGI is a 1Mbit asynchronous SRAM memory IC manufactured by Renesas Electronics Corporation, configured as 128K x 8 with parallel interface and 12 ns access time. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing system support and new designs. The part is housed in a 32-SOJ package with surface mount technology and operates across the industrial temperature range of -40°C to 85°C.

Key Parameters

Parameter	Value
Memory Type	Volatile SRAM
Memory Size	1Mbit
Memory Organization	128K x 8
Memory Interface	Parallel
Access Time	12 ns
Write Cycle Time	12 ns
Voltage Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	32-SOJ
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 71024S12YGI is determined by the following critical parameters: memory capacity (1Mbit), organization (128K x 8), parallel interface, supply voltage range (4.5V ~ 5.5V), package type (32-SOJ), and mounting technology (surface mount). Parts are grouped into two categories based on access time specifications:

Category A - Direct Equivalents (12 ns Access Time): Parts meeting or exceeding the 12 ns access time specification with identical operating temperature range (-40°C to 85°C) and package dimensions.

Category B - Functional Equivalents (15-20 ns Access Time): Parts with slower access times or restricted operating temperature ranges that maintain core electrical and mechanical compatibility but with performance or environmental trade-offs.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Organization	Access Time (ns)	Voltage Supply	Operating Temp (°C)	Package	Product Status	Packaging Type
71024S12YGI	Renesas Electronics	1Mbit	128K x 8	12	4.5V ~ 5.5V	-40 ~ 85	32-SOJ (10.16mm)	Obsolete	Bulk
71024S12TYGI	Renesas Electronics	1Mbit	128K x 8	12	4.5V ~ 5.5V	-40 ~ 85	32-SOJ (7.62mm)	Active	Tube
AS7C1024B-12JIN	Alliance Memory	1Mbit	128K x 8	12	4.5V ~ 5.5V	-40 ~ 85	32-SOJ (10.16mm)	Active	Tube
AS7C1025B-15JIN	Alliance Memory	1Mbit	128K x 8	15	4.5V ~ 5.5V	-40 ~ 85	32-SOJ (10.16mm)	Active	Tube
AS7C1024B-20JCNTR	Alliance Memory	1Mbit	128K x 8	20	4.5V ~ 5.5V	0 ~ 70	32-SOJ (10.16mm)	Active	Tape & Reel

Engineering Selection Recommendations

Primary Substitute (Direct Replacement): The 71024S12TYGI from Renesas Electronics is the manufacturer-recommended direct equivalent. It maintains identical electrical specifications (12 ns access time, -40°C to 85°C operating range, 4.5V to 5.5V supply voltage) and memory organization. The primary difference is package width (7.62mm versus 10.16mm) and packaging format (tube versus bulk). This part is active and ROHS3 compliant.

Secondary Substitutes (Electrical Equivalents): The AS7C1024B-12JIN from Alliance Memory provides identical electrical performance with 12 ns access time and full industrial temperature range support. Package dimensions match the original 71024S12YGI (10.16mm width). This part is active and ROHS3 compliant.

Functional Alternatives (Performance Trade-offs): The AS7C1025B-15JIN offers 15 ns access time with maintained industrial temperature range and identical memory organization. The AS7C1024B-20JCNTR provides 20 ns access time but operates only across the commercial temperature range (0°C to 70°C), making it unsuitable for applications requiring full industrial temperature support. Both alternatives are active and ROHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Can the 71024S12TYGI directly replace the 71024S12YGI in existing designs?

A: Yes. Both parts share identical electrical specifications (1Mbit capacity, 128K x 8 organization, 12 ns access time, -40°C to 85°C operating range, 4.5V to 5.5V supply voltage). The package width difference (7.62mm versus 10.16mm) must be verified against PCB layout constraints. The 71024S12TYGI is the manufacturer-recommended active equivalent.

Q: What is the impact of using AS7C1025B-15JIN with 15 ns access time instead of 12 ns?

A: The 15 ns access time is slower than the original 12 ns specification. This part is electrically compatible and maintains the full industrial temperature range (-40°C to 85°C). System timing analysis is required to confirm that the 3 ns additional access time does not violate critical path requirements in the target application.

Q: Why is AS7C1024B-20JCNTR not recommended for industrial applications?

A: The AS7C1024B-20JCNTR operates only across the commercial temperature range (0°C to 70°C), whereas the original 71024S12YGI supports the full industrial range (-40°C to 85°C). This part is suitable only for applications with restricted environmental operating conditions.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (71024S12TYGI, AS7C1024B-12JIN, AS7C1025B-15JIN, and AS7C1024B-20JCNTR) are ROHS3 compliant and REACH unaffected, matching the compliance status of the original 71024S12YGI.

Q: What packaging format differences exist among the substitutes?

A: The 71024S12YGI is supplied in bulk packaging. The 71024S12TYGI, AS7C1024B-12JIN, and AS7C1025B-15JIN are supplied in tube packaging. The AS7C1024B-20JCNTR is supplied in tape and reel format. Packaging selection depends on procurement volume and assembly process requirements.

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