UF304 / UF308 3A Ultra Fast Switching Rectifiers is a high efficiency product from ON Semiconductor. It features fast reverse recovery time, low forward voltage, low cost axial packages, void-free plastic in DO-201AD package, 3.0 Ampere operation at TA = 55°C with no thermal runaway, exceeds environmental standards of MIL-S-19500/228 and ultra fast switching for high efficiency.
The UF304 and UF308 are 3 A ultra‑fast switching rectifiers offered in a void‑free plastic DO‑201AD axial package. They feature low forward voltage, fast reverse‑recovery time and meet MIL‑S‑19500/228 environmental standards.
Key electrical characteristics include peak reverse voltages of 400 V (UF304) and 800 V (UF308), maximum RMS voltages of 280 V/560 V, average forward currents of 3.8 A/30 A at 55 °C, and reverse‑recovery times of 50 ns (UF304) and 75 ns (UF308). The devices operate from –55 °C to +150 °C and are supplied with moulded‑plastic cases and axial leads.
| Peak reverse voltage (repetitive) | UF304 – 400 V, UF308 – 800 V |
|---|---|
| Maximum RMS voltage | UF304 – 280 V, UF308 – 560 V |
| DC blocking voltage | UF304 – 400 V, UF308 – 800 V |
| Maximum forward voltage at 3 A, 25 °C | UF304 – 1.4 V, UF308 – 1.7 V |
| Reverse recovery time (0.5 A) | UF304 – 50 ns, UF308 – 75 ns |
| Operating temperature range | -55 °C to +150 °C |
| Typical junction capacitance | UF304 – 75 pF, UF308 – 50 pF |
| Package case material | Moulded plastic |
| Mounting position | Any |
The UF304 has a reverse recovery time of 50 ns, while the UF308 has 75 ns (measured at 0.5 A).
The devices can be mounted in any position.
They are rated for operation and storage from –55 °C to +150 °C.
The case is made of moulded plastic.