ROHM QST8 User Manual
Summary
The QST8 is a general-purpose power transistor designed for stable and efficient low-frequency audio amplification applications. This technical manual provides engineers with comprehensive specifications, including absolute maximum ratings, detailed electrical characteristics (like saturation voltage and current gain), and performance curves. It serves as an essential resource for designers building reliable electronic circuits that require robust power amplification capabilities within standard commercial equipment.
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Transistors
General purpose amplification (−12V, −1.5A) QST8
Application External dimensions (Unit : mm)
Low frequency amplifier
Driver
Features 1) A collector current is large. 2) Collector saturation voltage is low.
VCE (sat) : max. −200m V Each lead has same dimensions
At IC = −500m A / IB = −25m A
ROHM : TSMT6 Abbreviated symbol : T08
Absolute maximum ratings (Ta=25°C) Equivalent circuit 0.
Parameter Symbol Limits Unit
Collector-base voltage VCBO −15 (5)(6) (4)
Collector-emitter voltage VCEO −12 Emitter-base voltage VEBO −6 (5
IC −1.5 0. 2.
Collector current Tr1 Tr2
ICP −3
m W/TOTAL
Power dissipation PC 1.25 W/TOTAL
0.9 W/ELEMENT
Junction temperature Tj °C Range of storage temperature Tstg −55 to +150 °C
∗1 Single pulse, Pw=1ms ∗2 Each Terminal 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) −85 −200 m V IC= −500m A, IB= −25m A DC current gain h FE VCE= −2V, IC= −200m A Transition frequency f T MHz VCE= −2V, IE=200m A, f=100MHz
Corrector output capacitance Cob p F VCB= −10V, IE=0A, f=1MHz
∗Pulsed
Rev.A 1/2
Page Summary Contents For ROHM QST8 User Manual
Manual Details
| Brand | ROHM |
|---|---|
| Pages | 3 |
| File Size | 63.86 KB |
| Published | May 29, 2026 |
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Frequently Asked Questions
What are the recommended mounting specifications for this transistor?
It must be mounted on a 25mm×25mm×0.8mm ceramic substrate.
What are the maximum absolute ratings for voltage?
The limit voltages include VCBO of −15 V, VCEO of −12 V, and VEBO of −6 V.
When should I exercise caution regarding device usage?
Use caution if the malfunction could directly endanger human life (e.g., medical instruments or aerospace machinery).
What voltage is the saturation state for the collector-emitter junction?
The maximum specified value for the Collector-emitter saturation voltage VCE(sat) is 200 mV.