Device identity and key ratings
The AUIRFB8405-071: The 20 V rating sets the maximum rail voltage the FET can block in the off state — for a 12 V bus with transients, it leaves roughly 40% headroom before avalanche, which is typical for automotive-grade power stages. Supplied in Bulk packaging, this is a through-hole part suited for board-level assembly where tube or tray handling is the standard.
No second-source or cross-reference is documented by the manufacturer.