CY7C185-35VC Equivalent & Substitute Parts

Part Overview

The CY7C185-35VC is a 64Kbit asynchronous SRAM (Static Random Access Memory) IC manufactured by Infineon Technologies in a 28-SOJ surface mount package. This device provides parallel memory interface with 35 ns access time and operates within a 4.5V to 5.5V supply voltage range. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for system redesign, legacy equipment maintenance, and production continuity.

Key Parameters

Parameter	Value
Memory Type	Volatile SRAM
Memory Size	64Kbit
Memory Organization	8K x 8
Memory Interface	Parallel
Access Time	35 ns
Write Cycle Time	35 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 of the CY7C185-35VC is determined by the following critical parameters:

Memory Capacity & Organization: The substitute must provide 64Kbit capacity in 8K x 8 organization to maintain address and data bus compatibility.

Package & Pinout: The 28-BSOJ surface mount package with 0.300" (7.62mm) width is mandatory for PCB layout compatibility.

Memory Interface: Parallel interface architecture is required for direct replacement without circuit redesign.

Electrical Specifications: Supply voltage range, access time, and write cycle time must be compatible with the original circuit design parameters.

Technology: SRAM asynchronous technology ensures functional equivalence for timing-critical applications.

The IS61C64AL-10JLI meets all substitution criteria, offering superior performance characteristics while maintaining full pin and package compatibility.

Parameter Comparison

Parameter	CY7C185-35VC (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	35 ns	10 ns
Write Cycle Time	35 ns	10 ns
Voltage Supply Range	4.5V ~ 5.5V	4.75V ~ 5.25V
Operating Temperature Range	0°C ~ 70°C	-40°C ~ 85°C
Package Type	28-BSOJ (0.300", 7.62mm)	28-BSOJ (0.300", 7.62mm)
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 CY7C185-35VC based on the following engineering criteria:

Pin and Package Compatibility: Both devices utilize the 28-BSOJ package with identical physical dimensions and pinout configuration, enabling direct PCB replacement without layout modifications.

Memory Specifications: Identical 64Kbit capacity and 8K x 8 organization ensure address and data bus compatibility at the circuit level.

Performance Enhancement: The IS61C64AL-10JLI provides 10 ns access and write cycle times, which is superior to the original 35 ns specification. This faster performance is backward compatible with circuits designed for the CY7C185-35VC, as timing-critical paths will experience improved margins.

Supply Voltage Compatibility: The IS61C64AL-10JLI supply range (4.75V ~ 5.25V) is a subset of the CY7C185-35VC range (4.5V ~ 5.5V). Circuits operating within the narrower range will function without modification.

Product Status and Compliance: The IS61C64AL-10JLI is active production status with ROHS3 compliance, ensuring long-term availability and regulatory alignment compared to the obsolete CY7C185-35VC.

Extended Operating Temperature: The IS61C64AL-10JLI supports -40°C to 85°C operation, providing broader environmental capability than the original 0°C to 70°C range.

Frequently Asked Questions (FAQ)

Q: Can the IS61C64AL-10JLI directly replace the CY7C185-35VC without PCB modifications?

A: Yes. Both devices share identical 28-BSOJ package dimensions, pinout configuration, and parallel memory interface. Direct PCB replacement is possible without layout changes.

Q: Will the faster 10 ns access time of the IS61C64AL-10JLI cause compatibility issues?

A: No. Faster memory access time is backward compatible with circuits designed for 35 ns operation. Timing margins will improve rather than degrade.

Q: What is the impact of the narrower supply voltage range on the IS61C64AL-10JLI?

A: The IS61C64AL-10JLI operates within 4.75V to 5.25V, which is narrower than the CY7C185-35VC range of 4.5V to 5.5V. If your circuit operates within the 4.75V to 5.25V window, substitution is direct. Circuits requiring operation below 4.75V or above 5.25V require voltage regulation verification.

Q: Does the extended temperature range of the IS61C64AL-10JLI provide additional benefits?

A: The IS61C64AL-10JLI supports -40°C to 85°C operation compared to the original 0°C to 70°C. This extended range accommodates industrial and automotive applications without thermal derating.

Q: Is the IS61C64AL-10JLI RoHS compliant?

A: Yes. The IS61C64AL-10JLI is ROHS3 compliant, whereas the CY7C185-35VC is RoHS non-compliant. This compliance status is advantageous for new designs and regulated markets.

Q: Are there any package or moisture sensitivity differences?

A: Both devices share identical 28-BSOJ packaging and MSL 3 (168 Hours) moisture sensitivity classification. Handling and storage procedures remain unchanged.

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