CY7C199C-20VC Equivalent & Substitute Parts

Part Overview

The CY7C199C-20VC is a 256Kbit asynchronous SRAM memory IC manufactured by Infineon Technologies, featuring parallel interface architecture with 20 ns access time in a 28-SOJ surface mount package. This component is classified as obsolete, making substitute parts necessary for new designs, maintenance applications, or inventory replenishment. The part operates within the 4.5V to 5.5V supply voltage range and supports 32K x 8 memory organization typical of legacy embedded systems and industrial equipment.

Key Parameters

Parameter	Value
Memory Size	256Kbit
Memory Organization	32K x 8
Memory Type	Volatile SRAM
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

Substitute Part Grouping Explanation

Substitution eligibility for the CY7C199C-20VC is determined by the following critical parameters:

Memory capacity (256Kbit) and organization (32K x 8)
Parallel interface architecture
Package compatibility (28-BSOJ form factor)
Voltage supply range (4.5V ~ 5.5V)
Access time equal to or faster than 20 ns
Surface mount technology

The IS61C256AL-12JLI meets all substitution criteria. It maintains identical memory capacity, organization, interface type, and package form factor. The substitute part features 12 ns access time, which is faster than the original 20 ns specification, ensuring backward compatibility. Both parts operate within the same 4.5V to 5.5V supply voltage window and use identical 28-SOJ packaging.

Parameter Comparison

Parameter	CY7C199C-20VC (Main)	IS61C256AL-12JLI (Substitute)	Compatibility
Manufacturer	Infineon Technologies	ISSI (Integrated Silicon Solution Inc)	Different manufacturer
Memory Size	256Kbit	256Kbit	Identical
Memory Organization	32K x 8	32K x 8	Identical
Memory Type	Volatile SRAM	Volatile SRAM	Identical
Memory Interface	Parallel	Parallel	Identical
Access Time	20 ns	12 ns	Substitute is faster
Write Cycle Time	20 ns	12 ns	Substitute is faster
Voltage Supply Range	4.5V ~ 5.5V	4.5V ~ 5.5V	Identical
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	Substitute has wider range
Package / Case	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 in production
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Substitute meets current standards
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)	Identical

Engineering Selection Recommendations

The IS61C256AL-12JLI is a direct functional substitute for the CY7C199C-20VC based on the following engineering criteria:

Electrical Compatibility: Both parts operate within identical 4.5V to 5.5V supply voltage specifications and maintain the same parallel interface protocol. The substitute's 12 ns access time exceeds the performance requirement of the original 20 ns specification, ensuring no timing violations in existing circuit designs.

Physical Compatibility: Identical 28-BSOJ package dimensions and surface mount technology enable direct PCB footprint compatibility without layout modifications.

Product Status and Compliance: The CY7C199C-20VC is obsolete, making the IS61C256AL-12JLI the appropriate choice for new production and long-term availability. The substitute is actively manufactured and ROHS3 compliant, meeting current regulatory requirements.

Operational Range: The substitute supports an extended operating temperature range (-40°C to 85°C) compared to the original (0°C to 70°C), providing additional margin for industrial and extended-temperature applications.

Frequently Asked Questions (FAQ)

Q: Can the IS61C256AL-12JLI replace the CY7C199C-20VC in existing designs?

A: Yes. Both parts share identical memory capacity (256Kbit), organization (32K x 8), parallel interface architecture, supply voltage range (4.5V ~ 5.5V), and 28-BSOJ package form factor. The substitute's faster 12 ns access time is backward compatible with designs specified for 20 ns operation.

Q: What are the key differences between these parts?

A: The primary differences are manufacturer (Infineon vs. ISSI), product status (obsolete vs. active), and performance specifications. The substitute offers faster access time (12 ns vs. 20 ns), wider operating temperature range (-40°C to 85°C vs. 0°C to 70°C), and ROHS3 compliance versus non-compliance of the original.

Q: Are there any package considerations for substitution?

A: No. Both parts use identical 28-BSOJ surface mount packaging with 0.300" (7.62mm) width. PCB footprints, solder pad layouts, and mounting procedures are identical.

Q: Does the faster access time of the substitute create any compatibility issues?

A: No. Faster access time is a performance enhancement that maintains backward compatibility. Circuits designed for 20 ns operation will function correctly with 12 ns components.

Q: What is the moisture sensitivity level for both parts?

A: Both parts have MSL 3 rating with 168-hour floor life, requiring identical handling and storage procedures.

Q: Is the substitute suitable for industrial temperature applications?

A: The IS61C256AL-12JLI supports -40°C to 85°C operation, making it suitable for extended industrial temperature ranges. The original CY7C199C-20VC is limited to 0°C to 70°C.

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