Page 1
Transistors
Low frequency amplifier
QST4
zApplica tion
Low frequency amplifier
Driver
zFeatures
1) A collector current
CE(sat) : max. −250mV
2) V
At I
C=−1.5A / IB=−30mA
is large.
zExternal dimensions (Unit : mm)
ROHM : TSMT6
QST4
0.4
0.16
2.8
1.6
)
1
(
)
2
(
)
3
(
(6)(5)(4)
Each lead has same dimensions
Abbreviated symbol : T04
QST4
2.9
0.85
zAbsolute maximum ratings (Ta=25°C)
Parameter Symbol
Collector-base voltage
Collector-emitter voltage
Emitter-base voltage
Collector current
Power dissipation
Junction temperature
Range of storage temperature
Single pulse, PW=1ms
∗1
∗2
Each Termminal Mounted on a Recommended
Mounted on a 25mm
∗3
t
×
25mm
×
0.8mm Ceramic substrate
CBO
V
V
CEO
V
EBO
I
I
CP
P
Tj
Tstg
C
C
zElectrical characteristics (Ta=25°C)
Parameter Symbol Min. Typ. Max. Unit Conditions
Collector-base breakdown voltage
Collector-emitter breakdown voltage
Emitter-base breakdown voltage
Collector cutoff current
Emitter cutoff current
Collector-emitter saturation voltage
DC current gain
Transition frequency
Collector output capacitance
∗ Pulsed
Limits
−15
−12
−6
−3
−6
500
1.25 W
150
−55 to +150
Unit
V
V
V
A
A
mW
°C
°C
∗1
∗2
∗3
CBO
BV
CEO
BV
EBO
BV
CBO
I
EBO
I
V
CE(sat)
FE
h
f
T
Cob − 30 −
−15
−12
−6
−−
−−
−−
−−
−−
−−120
270 − 680
280
−
zEquivalent circuit
(1) (2) (3)
V
C
=−10µA
I
V
IC=−1mA
V
IE=−10µA
−100
−100
−250 mV
−
nA VCB=−15V
nA VEB=−6V
IC=−1.5A, IB=−30mA
CE
− V
MHz
VCE=−2V, IE=500mA, f=100MHz
V
CB
pF
(4)(5)(6)
=−2V, IC=−500mA
=−10V, IE=0A, f=1MHz
∗
∗
Rev.C
1/2
Page 2
Transistors
zPackaging specifications
Package
Type
Code
Basic ordering unit (pieces)
QST4
zElectrical characteristic curves
1000
125˚C
25˚C
FE
− 40˚C
100
DC CURRENT GAIN : h
VCE=−2V
Pulsed
10
0.001 0.01 0.1
COLLECTOR CURRENT : IC (
10
(A)
C
1
25˚C
0.1
Fig1. DC current gain
vs. collector current
110
A)
Taping
TR
3000
1
V)
(
CE(sat)
0.1
0.01
IC/IB=20/1
Pulsed
0.001
COLLECTOR SATURATION VOLTAGE : V
0.001 0.01 0.1 1
COLLECTOR CURRENT : IC (
Fig.2 Collector-emitter saturation voltage
vs. collector current
125˚C
25˚C
− 40˚C
1000
100
A)
Ta=25°C
VCE=2V
f=100MHz
10
V)
(
BE(sat)
1
− 40˚C
125˚C
IC/IB=20/1
BASE SATURATION VOLTAGE : V
Pulsed
0.1
10
0.001 0.01 0.1 1
COLLECTOR CURRENT : IC (
Fig.3 Base−emitter saturation voltage
1000
100
Cib
Cob
25˚C
vs.collector current
QST4
10
A)
I
C
=0A
f=1MHz
°C
Ta=25
125˚C
0.01
COLLECTOR CURRENT : I
IC/IB=20/1
Pulsed
0.001
0.1 1
BASE TO EMITTER CURRENT : VBE (V
Fig.4 Grounded emitter propagation
− 40˚C
charactereistics
TRANSITION FREQUENCY : fr (MHz)
10
10
0.01 0.1 1 10
)
EMITTER CURRENT : I
Fig.5 Gain bandwidth product
vs. emitter current
10
EMITTER INPUT CAPACITANCE : Cib (pF)
0.001 0.01 0.1 1 10
COLLECTOR OUTPUT CAPACITANCE : Cob (pF)
EMITTER TO BASE VOLTAGE : VEB(V)
E
(A)
Fig 6. Collector output capacitance vs. collector-base voltage
COLLECTOR TO BASE VOLTAGE : V
Emitter input capacitance vs. emitter-base volatage
Rev.C
100
CB
(V)
2/2
Page 3
Appendix
No technical content pages of this document may be reproduced in any form or transmitted by any
means without prior permission of ROHM CO.,LTD.
The contents described herein are subject to change without notice. The specifications for the
product described in this document are for reference only. Upon actual use, therefore, please request
that specifications to be separately delivered.
Application circuit diagrams and circuit constants contained herein are shown as examples of standard
use and operation. Please pay careful attention to the peripheral conditions when designing circuits
and deciding upon circuit constants in the set.
Any data, including, but not limited to application circuit diagrams information, described herein
are intended only as illustrations of such devices and not as the specifications for such devices. ROHM
CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any
third party's intellectual property rights or other proprietary rights, and further, assumes no liability of
whatsoever nature in the event of any such infringement, or arising from or connected with or related
to the use of such devices.
Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or
otherwise dispose of the same, no express or implied right or license to practice or commercially
exploit any intellectual property rights or other proprietary rights owned or controlled by
ROHM CO., LTD. is granted to any such buyer.
Products listed in this document are no antiradiation design.
Notes
The products listed in this document are designed to be used with ordinary electronic equipment or devices
(such as audio visual equipment, office-automation equipment, communications devices, electrical
appliances and electronic toys).
Should you intend to use these products with equipment or devices which require an extremely high level of
reliability and the malfunction of with would directly endanger human life (such as medical instruments,
transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other
safety devices), please be sure to consult with our sales representative in advance.
About Export Control Order in Japan
Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control
Order in Japan.
In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause)
on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction.
Appendix1-Rev1.1
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