CY7C199C-12VC Equivalent & Substitute Parts

Part Overview

The CY7C199C-12VC is a 256Kbit asynchronous SRAM memory IC manufactured by Infineon Technologies, featuring parallel interface architecture with 12 ns access time in a 28-SOJ surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system support, maintenance, and new design implementations where legacy compatibility is required.

Key Parameters

Parameter	Value
Memory Size	256Kbit
Memory Organization	32K x 8
Memory Format	SRAM
Technology	SRAM - Asynchronous
Memory Interface	Parallel
Access Time	12 ns
Write Cycle Time	12 ns
Voltage Supply	4.5V ~ 5.5V
Package / Case	28-BSOJ (0.300", 7.62mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the CY7C199C-12VC is determined by strict equivalence across the following critical parameters:

Memory capacity: 256Kbit minimum
Memory organization: 32K x 8 configuration
Access time: 12 ns or faster
Write cycle time: 12 ns or faster
Supply voltage range: 4.5V ~ 5.5V compatibility
Package type: 28-BSOJ surface mount
Memory interface: Parallel architecture
Memory format: Asynchronous SRAM

The IS61C256AL-12JLI meets all substitution criteria and is classified as an active product with current manufacturing status and improved compliance certifications.

Parameter Comparison

Parameter	CY7C199C-12VC (Main Part)	IS61C256AL-12JLI (Substitute)
Manufacturer	Infineon Technologies	ISSI (Integrated Silicon Solution Inc)
Memory Size	256Kbit	256Kbit
Memory Organization	32K x 8	32K x 8
Memory Format	SRAM	SRAM
Technology	SRAM - Asynchronous	SRAM - Asynchronous
Memory Interface	Parallel	Parallel
Access Time	12 ns	12 ns
Write Cycle Time	12 ns	12 ns
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C
Package / Case	28-BSOJ (0.300", 7.62mm Width)	28-BSOJ (0.300", 7.62mm Width)
Mounting Type	Surface Mount	Surface Mount
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The IS61C256AL-12JLI is the qualified substitute for the CY7C199C-12VC based on the following factors:

Electrical equivalence is confirmed across all critical parameters: identical memory capacity, organization, access time, write cycle time, and supply voltage specifications ensure functional interchangeability in circuit applications.

Product status transition from obsolete to active manufacturing provides supply chain continuity and long-term component availability for production and maintenance applications.

Compliance improvement is achieved through ROHS3 certification of the substitute part, compared to the non-compliant status of the original component. Both parts maintain REACH Unaffected status.

Operating temperature range expansion in the substitute part (-40°C ~ 85°C versus 0°C ~ 70°C) provides enhanced thermal performance capability, though applications requiring only the original temperature range remain fully compatible.

Packaging and mounting specifications are identical, enabling direct physical replacement without PCB redesign or mechanical modification.

Frequently Asked Questions (FAQ)

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

A: Yes. Both parts share identical memory capacity (256Kbit), organization (32K x 8), access time (12 ns), write cycle time (12 ns), supply voltage range (4.5V ~ 5.5V), and 28-BSOJ package specifications. Direct pin-for-pin substitution is supported without circuit modification.

Q: What are the key differences between these two parts?

A: The primary differences are product status (obsolete versus active), RoHS compliance (non-compliant versus ROHS3 compliant), and operating temperature range (-40°C ~ 85°C for the substitute versus 0°C ~ 70°C for the original). Electrical and functional specifications are equivalent.

Q: Does the wider operating temperature range of the IS61C256AL-12JLI affect compatibility?

A: No. The expanded temperature range of the substitute part is a superset of the original specification. Applications operating within the original 0°C ~ 70°C range remain fully compatible and unaffected.

Q: Are there any packaging or mounting differences?

A: No. Both parts use identical 28-BSOJ surface mount packaging with 0.300" (7.62mm) width. Mechanical compatibility and PCB footprint are identical.

Q: What is the significance of the RoHS compliance difference?

A: The substitute part IS61C256AL-12JLI meets ROHS3 compliance standards, while the original CY7C199C-12VC is non-compliant. For applications subject to RoHS regulations or environmental compliance requirements, the substitute part is the appropriate selection.

Q: Are moisture sensitivity specifications identical?

A: Yes. Both parts carry MSL 3 (168 Hours) moisture sensitivity level ratings, requiring identical handling, storage, and reflow procedures.

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