72 Mbit synchronous SRAM — obsolete, but the spec still matters for a BOM hold
The CY7C1471BV33-133BZXC: It belongs to the NoBL™ (No Bus Latency) series, meaning it eliminates the dead bus cycle between reads and writes — the next transaction starts on the clock edge after the previous one completes, which matters for pipelined data paths in networking or baseband ASIC interfaces. This part is now listed as Obsolete by the manufacturer.
Supply, temperature, and package — the board-fit constraints
Operates from a 3.135 V to 3.6 V core supply — a 3.3 V nominal rail with +/-5 % tolerance covers the range without an external regulator. The commercial temperature grade (0 °C to 70 °C) limits deployment to indoor, temperature-controlled equipment; no industrial or automotive extension is offered on this variant. The 165-ball LBGA package (15 x 17 mm body, 1.0 mm ball pitch per the FBGA-165 footprint) demands a controlled impedance PCB stack-up. The 2M x 36 parallel interface routes 36 data lines plus address and control — the trace-length matching budget on the DQ bus is tight at 133 MHz. The Tray packaging means the parts arrive in anti-static trays, not tape-and-reel; plan for manual or tray-fed pick-and-place.
Sourcing an obsolete synchronous SRAM — what to expect
The CY7C1471BV33-133BZXC is officially Obsolete. The only sourcing channel is the independent surplus and broker market, where lots are verified for authenticity and date-code freshness before quotation. Availability and pricing are lot-specific — confirmed at RFQ time against the required quantity. For a design still requiring this exact 72 Mbit NoBL™ part, the 165-FBGA footprint and 3.3 V supply are non-negotiable. No pin-compatible direct replacement from Infineon or a second source is documented — any alternative would require a board spin or an adapter.