CY7C109B-20ZC Equivalent & Substitute Parts

Part Overview

The CY7C109B-20ZC is a 1Mbit asynchronous SRAM memory IC manufactured by Infineon Technologies, featuring parallel interface architecture with 128K x 8 memory organization. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support, legacy equipment maintenance, and design continuity.

The primary reason for identifying substitute parts is the discontinued status of the CY7C109B-20ZC. Active production alternatives with compatible electrical and mechanical specifications enable system designers to maintain operational continuity without requiring substantial circuit redesign.

Key Parameters

Parameter	CY7C109B-20ZC
Memory Type	Volatile SRAM
Memory Size	1Mbit
Memory Organization	128K 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	32-TFSOP
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	Non-compliant

Substitute Part Grouping Explanation

Substitute parts for the CY7C109B-20ZC are identified based on strict electrical and mechanical compatibility criteria. The following parameters must align for valid substitution:

Memory capacity: 1Mbit
Memory organization: 128K x 8
Memory interface: Parallel
Package type: 32-TFSOP
Supply voltage range: 4.5V ~ 5.5V (compatible overlap required)
Mounting type: Surface Mount

The IS61C1024AL-12TLI meets all mandatory substitution criteria. While this part exhibits improved access time (12 ns versus 20 ns) and extended operating temperature range (-40°C ~ 85°C versus 0°C ~ 70°C), these represent performance enhancements rather than incompatibilities. The faster access time and broader temperature specification ensure functional compatibility in applications originally designed for the CY7C109B-20ZC.

Parameter Comparison

Parameter	CY7C109B-20ZC (Infineon)	IS61C1024AL-12TLI (ISSI)	Compatibility
Memory Size	1Mbit	1Mbit	Identical
Memory Organization	128K x 8	128K x 8	Identical
Memory Interface	Parallel	Parallel	Identical
Access Time	20 ns	12 ns	Compatible (faster)
Write Cycle Time	20 ns	12 ns	Compatible (faster)
Voltage Supply Range	4.5V ~ 5.5V	4.5V ~ 5.5V	Identical
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	Compatible (extended range)
Package Type	32-TFSOP	32-TFSOP	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Product Status	Obsolete	Active	Substitute is active
RoHS Status	Non-compliant	ROHS3 Compliant	Substitute offers compliance

Engineering Selection Recommendations

The IS61C1024AL-12TLI is a direct functional substitute for the CY7C109B-20ZC based on electrical and mechanical parameter alignment. Selection of this alternative provides the following advantages:

Active product status ensures ongoing availability and supply chain continuity
ROHS3 compliance addresses environmental and regulatory requirements
Improved access time (12 ns) and write cycle time (12 ns) provide performance margin beyond original specification
Extended operating temperature range (-40°C ~ 85°C) accommodates broader application environments
Identical package footprint (32-TFSOP) and pinout enable direct board-level replacement without layout modification

The substitute part maintains full electrical compatibility with the original design while offering enhanced specifications and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can the IS61C1024AL-12TLI replace the CY7C109B-20ZC in existing designs?

A: Yes. Both parts share identical memory capacity (1Mbit), organization (128K x 8), parallel interface, package type (32-TFSOP), and supply voltage range (4.5V ~ 5.5V). The substitute exhibits faster access and write cycle times, which are backward-compatible with designs specified for 20 ns operation.

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

A: The IS61C1024AL-12TLI provides 12 ns access time compared to the original 20 ns specification. This represents a performance enhancement that maintains compatibility with timing-critical applications originally designed for the CY7C109B-20ZC.

Q: Are there any package or pinout differences between these parts?

A: No. Both parts use the 32-TFSOP package with identical physical dimensions (0.724" × 18.40mm width) and pinout configuration, enabling direct board-level substitution.

Q: How does the extended operating temperature range affect compatibility?

A: The IS61C1024AL-12TLI operates across -40°C ~ 85°C, compared to the original 0°C ~ 70°C range. This extended specification ensures functionality across a broader temperature envelope, providing additional operational margin for applications originally designed within the narrower temperature window.

Q: What is the impact of RoHS3 compliance on substitution?

A: RoHS3 compliance in the IS61C1024AL-12TLI addresses environmental and regulatory requirements applicable to new designs and manufacturing processes. The original CY7C109B-20ZC, being obsolete and non-compliant, makes the substitute part preferable for systems requiring regulatory adherence.

Q: Is the substitute part available in the same packaging format?

A: Yes. The IS61C1024AL-12TLI is supplied in 32-TSOP I packaging (tray format), matching the mechanical and electrical interface of the original component.

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