30 A fast recovery diode — obsolete, but still specified in legacy PFC and SMPS designs
The STTH3002PI is a 30 A, 200 V fast recovery diode from STMicroelectronics, with a 50 ns reverse recovery time and a forward voltage drop of 1.05 V at 30 A. It comes in the DOP3I insulated through-hole package, rated for a maximum junction temperature of 175 °C.
50 ns trr at 30 A — the spec that drives the switching loss budget
The 50 ns reverse recovery time at 30 A average forward current is the headline parameter. The part is obsolete.
200 V reverse voltage, 1.05 V forward drop — conduction loss and voltage headroom
Rated for 200 V DC reverse maximum, the STTH3002PI fits into 170–200 V DC-link buses commonly found in single-phase PFC outputs. The 1.05 V forward drop at 30 A gives a conduction loss of about 31.5 W at full rated current — a sizeable figure that demands a heatsink with good thermal contact to the DOP3I package. The insulated DOP3I-2 body means you can bolt the diode directly to a grounded heatsink without an insulating pad, which simplifies assembly in high-voltage sections.
Obsolete — no official successor listed
STMicroelectronics lists the STTH3002PI as obsolete. For a BOM line that still calls this exact part, the supply path is through independent distribution — last-time-buy lots or surplus inventory. The reverse leakage at 200 V is 20 µA, which is typical for a fast recovery diode of this voltage class; date-code provenance matters more than parametric matching when buying obsolete stock.