600 V, 30 A fast-recovery diode — now obsolete
The STMicroelectronics STTH30L06D is a 600 V, 30 A fast-recovery rectifier rated for 90 ns reverse recovery time (trr) and a forward voltage of 1.55 V at 30 A. It comes in a TO-220AC through-hole package. This part is typically used in power-factor correction (PFC) boost stages, output rectification in switched-mode power supplies, and freewheeling diodes in motor drives where fast switching and low recovery losses matter.
90 ns trr — switching loss impact
A 90 ns trr at 30 A and 600 V puts this diode in the ultrafast class. In a hard-switched PFC stage running at 50-100 kHz, that recovery time keeps the reverse-recovery charge low enough that the MOSFET or IGBT turn-on losses stay manageable. If you are pushing toward 150 kHz, you will want to check the recovery charge (Qrr) in the full datasheet — the trr alone is a good first filter, but Qrr is the number that drives the loss calculation.
Obsolete — plan the replacement now
STMicroelectronics no longer manufactures this diode. Any stock you find is new-old-stock or surplus from distribution channels.
Sourcing the STTH30L06D today
Because this part is obsolete, it is not available through the standard factory supply chain. We source it through our independent distribution network — surplus inventories, overstock from OEMs, and verified broker channels. If you need a production quantity or a long-term supply plan, the smarter move is to identify and qualify a drop-in replacement now rather than chase shrinking stock.