This document is about the application and features of QST4 Transistors Rev.C 1/2 low frequency amplifier. The features include: 1) Large collector current; 2) Maximum VCE(sat) is -250mV at IC=-1.5A, IB=-30mA. This product is mainly used as a low frequency amplifier driver.
The QST4 is a low‑frequency amplifier transistor offered by ROHM. It is intended for use in driver circuits and audio‑visual or office‑automation equipment where a relatively large collector current is required.
The document lists absolute maximum ratings, electrical parameters such as voltage limits and gain, as well as mechanical dimensions and packaging information (TSMT6 surface‑mount package, 3000‑piece ordering unit).
| Collector‑base voltage (V_CBO) max | 15 V |
|---|---|
| Collector‑emitter voltage (V_CEO) max | 12 V |
| Emitter‑base voltage (V_EBO) max | 6 V |
| Collector current (I_C) max | 1.5 A |
| Power dissipation (P_D) typical / max | 500 mW / 1.25 W |
| Junction temperature (T_j) max | 150 °C |
| Storage temperature range | -55 °C to +150 °C |
| Package type | TSMT6 |
| Basic ordering unit | 3000 pieces |
The QST4 can handle a collector current up to 1.5 A.
The QST4 is supplied in a TSMT6 surface‑mount package.
It can be stored from –55 °C up to +150 °C.