High-side switch for 12 V automotive loads — what the ratings mean
8 mOhm Rds(on) — the thermal and voltage-drop budget
At 13 A the 8 mOhm typical on-resistance drops just over 100 mV across the switch and dissipates about 1.35 W. The 150°C junction ceiling leaves headroom for ambient under-hood temperatures above 100°C, but the layout must pull heat into the board plane.
The 12-BSOP (0.295", 7.50 mm width) exposed-pad package — Infineon's PG-DSO-12-16 — is a surface-mount body with a large thermal pad on the underside. The narrow 0.50 mm pitch leads demand careful solder-paste stencil alignment, but the pad itself is the primary thermal path, not the leads.
Infineon lists the BTS500801EGAAUMA1 as obsolete. For BOM lines that still call out this exact PROFET® variant, the supply path runs through independent distribution — new-old-stock inventory, surplus lots, or broker-sourced material. Every unit should be date-code traced and the laser etch on the package face checked against Infineon's factory marking standards; the risk of re-marked or relabeled stock rises once the authorized channel closes out.