CY7C185-25VC Equivalent & Substitute Parts

Part Overview

The CY7C185-25VC is a 64Kbit asynchronous SRAM (Static Random Access Memory) IC manufactured by Infineon Technologies, housed in a 28-SOJ surface mount package. This component is classified as obsolete, making substitute parts necessary for new designs, maintenance, or production continuity. The part operates with a 25 ns access time and requires a 4.5V to 5.5V supply voltage, serving applications requiring parallel memory interface with 8K x 8 organization.

Key Parameters

Parameter	Value
Memory Type	Volatile SRAM
Memory Size	64Kbit
Memory Organization	8K x 8
Memory Interface	Parallel
Access Time	25 ns
Write Cycle Time	25 ns
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	28-BSOJ (0.300", 7.62mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the CY7C185-25VC is determined by the following critical parameters:

Memory capacity (64Kbit) and organization (8K x 8) must remain identical
Parallel memory interface is mandatory
Package type must be 28-BSOJ surface mount to ensure PCB compatibility
Access time and write cycle time must be equal to or faster than 25 ns
Supply voltage range must be compatible or encompass the original specification
Operating temperature range should support the intended application environment

The IS61C64AL-10JLI meets these substitution criteria with improved performance characteristics while maintaining functional and physical compatibility.

Parameter Comparison

Parameter	CY7C185-25VC (Main Part)	IS61C64AL-10JLI (Substitute)
Manufacturer	Infineon Technologies	ISSI (Integrated Silicon Solution Inc)
Memory Size	64Kbit	64Kbit
Memory Organization	8K x 8	8K x 8
Memory Interface	Parallel	Parallel
Access Time	25 ns	10 ns
Write Cycle Time	25 ns	10 ns
Voltage Supply Range	4.5V ~ 5.5V	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C
Package Type	28-BSOJ (0.300", 7.62mm Width)	28-BSOJ (0.300", 7.62mm Width)
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 IS61C64AL-10JLI is a direct functional substitute for the CY7C185-25VC. Key selection factors include:

The substitute part offers superior access and write cycle times (10 ns versus 25 ns), providing performance headroom for timing-critical applications
The substitute maintains identical memory capacity, organization, and parallel interface architecture
Physical compatibility is assured through identical 28-BSOJ package specifications
The substitute is in active production status, ensuring long-term availability and supply chain stability
The substitute achieves ROHS3 compliance, whereas the original part is non-compliant, supporting modern environmental and regulatory requirements
Operating temperature range expansion (-40°C to 85°C) provides broader environmental applicability
Supply voltage range of the substitute (4.75V to 5.25V) is narrower but fully contained within standard 5V logic supply specifications

Frequently Asked Questions (FAQ)

Q: Can the IS61C64AL-10JLI directly replace the CY7C185-25VC without PCB modifications?

A: Yes. Both parts use identical 28-BSOJ package dimensions and pinout. No PCB layout changes are required for physical substitution.

Q: What is the impact of the faster access time (10 ns vs 25 ns) on system compatibility?

A: Faster access time is backward compatible. Systems designed for 25 ns operation will function correctly with 10 ns memory. No timing violations occur when substituting with faster components.

Q: Are there voltage supply compatibility concerns?

A: The substitute's supply range (4.75V to 5.25V) is narrower than the original (4.5V to 5.5V). Verify that your power supply operates within 4.75V to 5.25V. Standard 5V regulated supplies typically meet this requirement.

Q: Does the expanded operating temperature range of the substitute affect selection?

A: The substitute's range (-40°C to 85°C) exceeds the original specification (0°C to 70°C). This provides additional margin for applications in extended temperature environments but does not restrict use in standard temperature ranges.

Q: What is the significance of RoHS3 compliance on the substitute part?

A: RoHS3 compliance indicates the substitute meets current environmental and hazardous substance restrictions. For new designs or products subject to environmental regulations, the substitute is the appropriate choice.

Q: Are the moisture sensitivity levels equivalent?

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

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