CY7C109B-15ZC Equivalent & Substitute Parts

Part Overview

The CY7C109B-15ZC is a 1Mbit asynchronous SRAM memory IC manufactured by Infineon Technologies, featuring parallel interface architecture with 128K x 8 memory organization. This component is classified as obsolete, making substitute parts necessary for new designs and ongoing production support. The part operates within the 4.5V to 5.5V supply voltage range with a 15 ns access time and is housed in a 32-TFSOP surface mount package.

Key Parameters

Parameter	Value
Memory Type	Volatile SRAM
Memory Size	1Mbit
Memory Organization	128K x 8
Memory Interface	Parallel
Access Time	15 ns
Write Cycle Time	15 ns
Voltage Supply Range	4.5V ~ 5.5V
Package Type	32-TFSOP
Mounting Type	Surface Mount
Operating Temperature	0°C ~ 70°C
Moisture Sensitivity Level	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the CY7C109B-15ZC is determined by strict alignment of the following parameters:

Memory capacity and organization must remain constant at 1Mbit with 128K x 8 configuration to ensure functional equivalence. The parallel interface architecture is mandatory for pin-level compatibility. The 32-TFSOP surface mount package is required for mechanical and electrical compatibility with existing PCB layouts. Supply voltage range of 4.5V to 5.5V must be supported. Access time and write cycle time specifications must meet or exceed the original 15 ns requirement. Moisture sensitivity level must not exceed MSL 3 to maintain handling and storage compatibility.

The IS61C1024AL-12TLI qualifies as a direct substitute based on these criteria, offering improved access time performance while maintaining all critical electrical and mechanical parameters.

Parameter Comparison

Parameter	CY7C109B-15ZC (Main)	IS61C1024AL-12TLI (Substitute)
Manufacturer	Infineon Technologies	ISSI (Integrated Silicon Solution Inc)
Memory Size	1Mbit	1Mbit
Memory Organization	128K x 8	128K x 8
Memory Interface	Parallel	Parallel
Access Time	15 ns	12 ns
Write Cycle Time	15 ns	12 ns
Voltage Supply Range	4.5V ~ 5.5V	4.5V ~ 5.5V
Package Type	32-TFSOP	32-TFSOP
Mounting Type	Surface Mount	Surface Mount
Operating Temperature Range	0°C ~ 70°C	-40°C ~ 85°C
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The IS61C1024AL-12TLI is a qualified substitute for the CY7C109B-15ZC based on the following factors:

The substitute part maintains identical memory capacity, organization, and interface specifications, ensuring functional compatibility at the system level. The 12 ns access and write cycle times represent improved performance over the original 15 ns specification, providing timing margin in existing designs. Both parts share identical supply voltage requirements and package geometry, eliminating the need for PCB redesign or power supply modifications.

The substitute part carries Active product status, ensuring long-term availability and supply chain continuity compared to the Obsolete status of the original part. The IS61C1024AL-12TLI achieves ROHS3 compliance, addressing regulatory requirements that may apply to new production runs. The extended operating temperature range of -40°C to 85°C provides broader environmental coverage than the original 0°C to 70°C specification.

Frequently Asked Questions (FAQ)

Q: Can the IS61C1024AL-12TLI be used as a direct pin-for-pin replacement?

A: Yes. Both parts utilize the 32-TFSOP package with identical pinout and electrical interface specifications. No PCB modifications are required for substitution.

Q: What is the impact of the faster 12 ns access time on system compatibility?

A: The faster access time of the IS61C1024AL-12TLI is backward compatible with designs specified for 15 ns operation. Systems designed for the original part will function correctly with the substitute without timing violations.

Q: Are there any supply voltage considerations when switching to the IS61C1024AL-12TLI?

A: No. Both parts operate within the identical 4.5V to 5.5V supply voltage range. Existing power supply configurations require no adjustment.

Q: How does the extended operating temperature range affect system design?

A: The IS61C1024AL-12TLI supports -40°C to 85°C operation compared to the original 0°C to 70°C range. This provides additional thermal margin for applications requiring extended temperature performance, though designs operating within 0°C to 70°C remain fully compatible.

Q: What is the significance of ROHS3 compliance on the substitute part?

A: ROHS3 compliance indicates the substitute part meets current environmental and regulatory standards for hazardous substance restrictions. This is relevant for new production runs and markets with regulatory compliance requirements.

Q: Are moisture sensitivity levels equivalent between the two parts?

A: Yes. Both parts carry MSL 3 (168 Hours) classification, requiring identical handling, storage, and reflow procedures during assembly.

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