The Infineon CY62147DV30LL-70ZSXIT is a 4 Mbit asynchronous SRAM from the MoBL® series, organized as 256K x 16 bits. It uses a parallel interface and runs from a 2.2V to 3.6V supply, which means it can sit on either a 2.5V or 3.3V bus without a level shifter. The 70 ns access time is the headline timing spec — it determines whether this part can keep up with a given memory controller or FPGA soft core.
At 70 ns, this is a slower asynchronous SRAM, suited for controllers that do not need zero-bus-turnaround or high clock rates. It works well with 8-bit or 16-bit MCUs running below 20 MHz, or with CPLD/FPGA glue logic that can stretch the read cycle. If your design needs faster throughput — say 10 ns access — the CY7C1041GN30-10BVXI is a pin-compatible alternative in the same 4 Mbit density and 44-TSOP II footprint, but it runs at 10 ns and typically costs more per unit.
Package and mounting
The 44-TSOP II package (0.400" body width, 10.16 mm) is a standard surface-mount footprint for this density. The leads are gull-wing, so you can rework it with a hot-air station or a fine-tip iron — no BGA underfill to worry about. Marking on the top side is clear enough to read under a loupe.
Sourcing and lifecycle posture
For dual-sourcing flexibility, the CY7C1041GN30-10BVXI is a functional second source in the same package and density, though its 10 ns access time is faster and its supply voltage range is 2.2V to 3.6V as well.