qsx3 is a low frequency amplifier from rohm company. it has large collector current and low voltage drop. it is mainly used in drive circuits.
This document describes the ROHM QSX3 low‑frequency amplifier transistor. It lists the device's key features, external dimensions, and recommended mounting on a 25 mm × 25 mm × 0.8 mm ceramic substrate.
Detailed electrical specifications are given, including absolute maximum ratings, typical performance curves, and packaging information. An appendix contains legal and export‑control notices.
| Collector‑base voltage (Vcbo) | 30 V |
|---|---|
| Collector‑emitter voltage (Vceo) | 30 V |
| Emitter‑base voltage (Vebo) | 6 V |
| Collector current (Ic) | 5 A |
| Power dissipation (Pc) | 195 mW |
| Junction temperature (Tj) | 150 °C |
| Storage temperature range | -55 °C to +150 °C |
| DC current gain (hFE) | 270 – 680 |
| Transition frequency (fT) | 360 MHz |
| Collector output capacitance (Cob) | 20 pF |
The QSX3 can handle a collector current of up to 5 A.
The device’s absolute maximum ratings are 30 V for collector‑base and collector‑emitter voltages, and 6 V for emitter‑base voltage.
The QSX3 is supplied in a ROHM TSMT6 package and is recommended to be mounted on a 25 mm × 25 mm × 0.8 mm ceramic substrate.