QSZ3 is a double-tube transistor produced by ROHM. It integrates 2SB1705 and 2SD2670 two transistors, and its package form is TSMT5, which has the characteristics of low VCE(sat) and small package.
The QSZ3 is a general‑purpose isolated transistor (also usable as a diode) offered in a TSMT5 surface‑mount package. It is intended for use in DC‑DC converters, motor drivers, and similar applications where low saturation voltage and a small footprint are required.
The document lists absolute maximum ratings, electrical characteristics, and packaging details, including voltage limits, current capability, power dissipation, and thermal specifications. An appendix contains legal and export‑control notices from ROHM.
| Collector‑base voltage (Vcbo) | 15 V |
|---|---|
| Collector‑emitter voltage (Vceo) | 12 V |
| Emitter‑base voltage (Vebo) | 6 V |
| Power dissipation (Pd) | 1.25 W |
| Junction temperature (Tj) | 150 °C |
| Storage temperature range | -55 to +150 °C |
| Package | TSMT5 |
| Marking | Z03 |
| Basic ordering unit | 3000 pieces |
The QSZ3 is supplied in a TSMT5 surface‑mount package.
The device is rated for a collector‑base voltage of 15 V, collector‑emitter voltage of 12 V, and emitter‑base voltage of 6 V.
The QSZ3 can dissipate up to 1.25 W.