Depth and width expansion — cascading without glue
The 72V03L15JG supports depth and width expansion, meaning multiple devices can be cascaded for deeper or wider FIFO arrays without external logic. For a 4K x 9 buffer, two parts cascade depth-wise using the expansion logic pins. For a 2K x 18, two parts run in parallel with shared control signals. The retransmit capability lets the FIFO replay data from a programmed marker — useful in packet retry flows or error-recovery sequences where the host doesn't want to re-request the data.
No official direct replacement or second-source alternate is cited in the available records; if dual-sourcing is required, verify pin-compatible alternatives from the 72V family independently.