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Infineon Technologies CY7C109B-12VC — Memory (DRAM / SRAM / Flash / EEPROM)

Infineon CY7C109B-12VC 1 Mbit Async SRAM, 12 ns, 32-SOJ

MPNCY7C109B-12VC
Obsolete

Infineon CY7C109B-12VC, 1 Mbit asynchronous SRAM, 128K x 8 organization, 12 ns access time, parallel interface, 4.5 V to 5.5 V supply, 0°C to 70°C, 32-SOJ package.

Infineon Technologies CY7C109B-12VC datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

CY7C109B-12VC specifications
ParameterValue
Memory typeVolatile
MountingSurface Mount
Voltage4.5V ~ 5.5V
Memory interfaceParallel
Operating temperature0°C~70°C(TA)
PackageTube
TechnologySRAM - Asynchronous
Access time12 ns
Memory size1Mbit
Memory formatSRAM
Case32-BSOJ (0.400\", 10.16mm Width)
Memory organization128K x 8
Write cycle time - word, page12ns

Product details

12 ns access time — timing closure for the bus

The CY7C109B-12VC is a 1 Mbit asynchronous SRAM from Infineon (formerly Cypress), organized as 128K x 8 bits. Its 12 ns access time means the part can deliver data within 12 ns of an address change, which is fast enough for many mid-speed 8-bit or 16-bit bus systems without inserting wait states. The write cycle time matches the read at 12 ns, so back-to-back writes are equally tight. This part runs on a 5 V ±0.5 V supply rail — a legacy voltage that is becoming less common in newer designs but is still standard in many industrial controllers, telecom line cards, and test equipment that maintain a 5 V bus.

The 32-SOJ package (32-BSOJ, 0.400" body width) is a surface-mount, J-bend footprint that was common in the 1990s and 2000s for memory modules.

Infineon lists the CY7C109B-12VC as obsolete.

Frequently asked questions

What is the replacement for CY7C109B-12VC?

Infineon has not published an official direct replacement. For new designs, consider current-production 5 V async SRAMs in the same 32-SOJ footprint from ISSI, Alliance Memory, or Renesas — but verify pin compatibility against the respective datasheets.

What is the access time of CY7C109B-12VC?

The access time is 12 ns for both read and write cycles.

Can CY7C109B-12VC be used as replacement for CY7C109B-10VC?

The CY7C109B-12VC is a slower-speed variant (12 ns) of the same base part number. The CY7C109B-10VC has a 10 ns access time. If your system timing requires 10 ns, the 12 ns part will not meet the spec. Otherwise, they are pin-compatible and functionally identical.