Synchronous FIFO — 72K depth at 66.7 MHz
The CY7C4251V-15AC is a 72 Kbit (8 K x 9) synchronous FIFO from the CY7C series, clocked at 66.7 MHz with an 11 ns access time. The 9-bit width (8 data bits plus one parity/control bit) suits applications needing a sideband flag alongside the data word — typical in telecom line cards, industrial data buffers, and video frame stores where a 9-bit bus aligns with byte-plus-parity architectures.
Sourcing is via independent surplus and broker channels, with quantities and date codes confirmed at RFQ. For designs still using this footprint, the 32-TQFP (7x7 mm) package and 3.3 V supply rail are common across the CY7C synchronous FIFO family, but pin-compatibility with any specific sibling depends on the exact depth/width variant — verify the BOM position against the base part number 7C4251 before committing a substitute.
Package and board-fit — 32-TQFP
Housed in a 32-lead TQFP (7x7 mm) with a 0.8 mm pitch, the CY7C4251V-15AC is a surface-mount part suited for reflow assembly. The supplier device package (32-TQFP 7x7) matches the standard JEDEC footprint for this body size — layout guidance is available in the CY7C series datasheet. The commercial temperature grade (0°C to 70°C) limits deployment to indoor, temperature-controlled environments — not suitable for extended industrial or automotive ambient ranges without active cooling.