The difference between the Digi-Key # ISL83072EIBZA-TTR-ND (Renesas ISL83072EIBZA-T) vs Digi-Key # ISL83072EIBZA-T7ATR-ND (Renesas # ISL83072EIBZA-T7A) is the T7A suffix calls out a 250 piece tape and reel. The T suffix calls out the standard tape and reel.
Resource for packaging codes
TB347: Tape and Reel Specification for Integrated Circuits (renesas.com)