ROHM QST4 User Guide
Summary
This comprehensive datasheet details a high-performance transistor manufactured for reliable low-frequency amplification applications. The manual provides exhaustive technical specifications, including absolute maximum ratings and a variety of electrical characteristics. It covers detailed operational curves, such as collector saturation voltage, ensuring designers have all necessary parameters to integrate this component into circuits requiring stable power output and amplification capabilities.
Page 1 Text Content
Transistors
Low frequency amplifier QST4
Application External dimensions (Unit : mm)
Low frequency amplifier
Driver
Features 1) A collector current is large. 2) VCE(sat) : max. −250m V At IC=−1.5A / IB=−30m A
Each lead has same dimensions
ROHM : TSMT6 Abbreviated symbol : T04
QST4 0.
Absolute maximum ratings (Ta=25°C) Equivalent circuit
Parameter Symbol Limits Unit
Collector-base voltage VCBO −15 (4)(5)(6)
Collector-emitter voltage VCEO −12 Emitter-base voltage VEBO −6 IC −3
Collector current
ICP −6
Power dissipation PC
Junction temperature Tj °C Range of storage temperature Tstg −55 to +150 °C ∗1 Single pulse, PW=1ms ∗2 Each Termminal Mounted on a Recommended ∗3 Mounted on a 25mm×25mm× 0.8mm Ceramic substratet
Electrical characteristics (Ta=25°C)
Parameter Symbol Min. Typ. Max. Unit Conditions
Collector-base breakdown voltage BVCBO −15 IC=−10µA Collector-emitter breakdown voltage BVCEO −12 IC=−1m A Emitter-base breakdown voltage BVEBO −6 IE=−10µA
Collector cutoff current ICBO −100 n A VCB=−15V
Emitter cutoff current IEBO −100 n A VEB=−6V
Collector-emitter saturation voltage VCE(sat) −120 −250 m V IC=−1.5A, IB=−30m A DC current gain h FE VCE=−2V, IC=−500m A Transition frequency f T 280 − MHz VCE=−2V, IE=500m A, f=100MHz
Collector output capacitance Cob p F VCB=−10V, IE=0A, f=1MHz
∗ Pulsed
Rev.C 1/2
Page Summary Contents For ROHM QST4 User Guide
Manual Details
| Brand | ROHM |
|---|---|
| Pages | 3 |
| File Size | 62.71 KB |
| Published | July 15, 2026 |
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Frequently Asked Questions
What is the recommended usage environment for this component?
It is designed for ordinary electronic equipment like audio visual, office-automation, communications devices, or electrical appliances.
Should I use this device in critical safety applications?
No, consult a sales representative if using it with life-support systems (e.g., medical instruments or aerospace machinery).
What are the peak power dissipation limits?
The maximum specified power dissipation (Pc) is 1.25 W when mounted on a specific ceramic substrate.
How many pieces are in one standard bulk order?
The basic ordering unit for this package type is 3000 pieces.