The STTH1L06A is a 600 V, 1 A fast-recovery rectifier from STMicroelectronics, housed in a DO-214AC (SMA) surface-mount package. Its 80 ns reverse recovery time places it in the fast-recovery class — not ultrafast, but fast enough to cut switching losses in continuous-conduction-mode PFC boost stages and flyback snubbers where a standard recovery diode would overheat. The 1.3 V forward drop at 1 A is typical for this voltage and speed class; the 1 µA reverse leakage at the full 600 V rating gives confidence in high-temperature idle conditions. A 175 °C maximum junction temperature provides thermal headroom for compact designs where the SMA body has limited copper to sink heat.
ST lists the STTH1L06A as Active. The base product number STTH1 covers a family of voltage and speed variants; the L06A suffix identifies the 600 V, 1 A, 80 ns trr option.
SMA package — board-area reality
The DO-214AC (SMA) footprint is a common two-pad SMD outline shared across many 1 A rectifiers. The junction-to-ambient thermal resistance depends heavily on the PCB copper area; the 175 °C Tj rating gives margin, but the designer should still size the pad and via array for the expected average current and ambient temperature. No exposed pad here — the junction relies on the leadframe and solder joints for heat extraction.