CY7C185-20VC Equivalent & Substitute Parts

Part Overview

The CY7C185-20VC is a 64Kbit asynchronous SRAM memory IC manufactured by Infineon Technologies, packaged in a 28-SOJ surface mount configuration. This component is classified as obsolete, making substitute parts necessary for new designs, maintenance, or production continuity. The part operates with a 20 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	CY7C185-20VC
Memory Type	Volatile SRAM
Memory Size	64Kbit
Memory Organization	8K x 8
Memory Interface	Parallel
Access Time	20 ns
Write Cycle Time	20 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
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the CY7C185-20VC is determined by the following critical parameters:

Memory capacity (64Kbit) and organization (8K x 8) must remain identical
Memory interface type must be parallel
Package type must be 28-BSOJ with matching physical dimensions
Access time and write cycle time must be equal to or faster than the original specification
Supply voltage range must be compatible or overlapping with system requirements
Mounting type must be surface mount

The IS61C64AL-10JLI meets these substitution criteria. It maintains the same memory capacity, organization, parallel interface, and identical package footprint. The faster access time (10 ns versus 20 ns) and improved temperature range provide enhanced performance characteristics while maintaining backward compatibility at the board level.

Parameter Comparison

Parameter	CY7C185-20VC	IS61C64AL-10JLI	Compatibility
Memory Size	64Kbit	64Kbit	Identical
Memory Organization	8K x 8	8K x 8	Identical
Memory Interface	Parallel	Parallel	Identical
Access Time	20 ns	10 ns	Substitute is faster
Write Cycle Time	20 ns	10 ns	Substitute is faster
Voltage Supply Range	4.5V ~ 5.5V	4.75V ~ 5.25V	Overlapping range
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	Substitute has wider range
Package Type	28-BSOJ (0.300", 7.62mm Width)	28-BSOJ (0.300", 7.62mm Width)	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Product Status	Obsolete	Active	Substitute is current
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Substitute meets current standards

Engineering Selection Recommendations

The IS61C64AL-10JLI is a direct functional substitute for the CY7C185-20VC based on the following engineering criteria:

Pin-compatible footprint and identical package dimensions ensure direct board-level replacement without layout modifications. The substitute part maintains the same memory capacity and organization, ensuring software and firmware compatibility without code changes.

The IS61C64AL-10JLI offers improved performance characteristics with faster access and write cycle times (10 ns versus 20 ns), which provides timing margin in existing designs. The extended operating temperature range (-40°C to 85°C versus 0°C to 70°C) supports broader application environments.

The substitute part holds active product status with ROHS3 compliance, addressing regulatory requirements for new production and long-term supply chain sustainability. The overlapping supply voltage range (4.75V to 5.25V within the original 4.5V to 5.5V specification) ensures compatibility with standard 5V logic systems.

Frequently Asked Questions (FAQ)

Q: Can the IS61C64AL-10JLI replace the CY7C185-20VC in existing designs without PCB modifications?

A: Yes. Both parts use the identical 28-BSOJ package with matching pin assignments and physical dimensions. Direct socket substitution is possible without board redesign.

Q: What is the impact of the faster access time in the substitute part?

A: The IS61C64AL-10JLI operates at 10 ns access time compared to the original 20 ns specification. This faster performance is backward compatible and improves system timing margins. No design changes are required.

Q: Are there voltage supply compatibility concerns?

A: The substitute part operates within 4.75V to 5.25V, which overlaps with the original specification of 4.5V to 5.5V. Systems designed for standard 5V operation will function correctly with both parts. Designs operating at the extremes of the original range (below 4.75V or above 5.25V) require evaluation.

Q: Why is the substitute part recommended despite the voltage range difference?

A: The overlapping voltage range (4.75V to 5.25V) covers the standard 5V operating point used in most applications. The substitute part's ROHS3 compliance and active product status provide long-term supply assurance and regulatory alignment for new designs.

Q: Does the wider operating temperature range of the substitute part affect compatibility?

A: No. The substitute part's extended temperature range (-40°C to 85°C) is a superset of the original specification (0°C to 70°C). Applications operating within the original temperature range will function identically with the substitute part.

Q: What is the significance of the product status change from Obsolete to Active?

A: The substitute part's active status ensures ongoing availability, manufacturing support, and supply chain continuity. The original part's obsolete status makes the substitute necessary for production quantities and long-term maintenance.

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