UMT3906 / SST3906 / MMST3906 is a PNP general purpose transistor produced by ROHM. Its features are BVCEO > −40V (IC= −1mA), which can complement T3904/SST3904/MMST3909 and has low capacitance characteristics. The tube has SC-70 and SC-59 two kinds of package form.
The UMT3906, SST3906, and MMST3906 are PNP general‑purpose transistors offered by ROHM. They feature low capacitance and are intended for use in a variety of electronic equipment such as audio‑visual, communications, and office‑automation devices. The devices are supplied in SC‑70 (EIA) surface‑mount packages with standard marking codes.
Key specifications include a collector‑emitter voltage rating of 40 V, a maximum collector current of 0.2 A, and a transition frequency of 250 MHz. Electrical characteristics such as capacitances, delay times, and storage times are provided for design reference, along with absolute maximum ratings and recommended operating conditions.
| Collector‑emitter voltage (Vceo) | 40 V |
|---|---|
| Collector current (Ic) | 0.2 A |
| Junction temperature (Tj) | 150 °C |
| Storage temperature (Tstg) | -55 °C to +150 °C |
| Transition frequency (ft) | 250 MHz |
| Collector output capacitance (Cob) | 45 pF |
| Emitter input capacitance (Cib) | 10 pF |
| Delay time (td) | 35 ns |
| Rise time (tr) | 35 ns |
| Fall time (tf) | 75 ns |
| Storage time (tstg) | 225 ns |
The collector‑emitter voltage rating is 40 V.
The devices can be stored from –55 °C up to +150 °C.
The transition frequency is specified as 250 MHz.
They are supplied in an SC‑70 (EIA) surface‑mount package.