KST4125
General Purpose Transistor
PNP Epitaxial Silicon Transistor
3
2
SOT-23
1
1. Base 2. Emitter 3. Collector
KST4125
Absolute Maximum Ratings
Ta=25°C unless otherwise noted
Symbol Parameter Value Units
V
CBO
V
CEO
V
EBO
I
C
P
C
T
STG
• Refer to KST3906 for graphs
Electrical Characteristics
Collector-Base Voltage -30 V
Collector-Emitter Voltage -30 V
Emitter-Base Voltage -4 V
Collector Current -200 mA
Collector Power Dissipation 350 mW
Storage Temperature 150 °C
Ta=25°C unless otherwise noted
Symbol Parameter Test Condition Min. Max. Units
BV
CBO
BV
CEO
BV
EBO
I
CBO
I
EBO
h
FE
V
(sat) * Collector-Emitter Saturation Voltage IC= -50mA, IB= -5.0mA -0.4 V
CE
(sat) * Base-Emitter Saturation Voltage IC= -50mA, IB= -5.0mA -0.95 V
V
BE
f
T
C
ob
NF Noise Figure I
* Pulse Test: PW≤300µs, Duty Cycle≤2%
Collector-Base Breakdown Voltage IC= -10µA, IE=0 -30 V
* Collector-Emitter Breakdown Voltage IC= -1mA, IE=0 -30 V
Emitter-Base Breakdown Voltage IE= -10µA, IC=0 -4 V
Collector Cut-off Current VCB= -20V, IE=0 -50 nA
Emitter Cut-off Current VEB= -3V, IC=0 -50 nA
* DC Current Gain VCE= -1V, IC= -2.0mA
= -1V, IC= -50mA
V
CE
Current Gain Bandwidth Product IC= -10mA, VCE= -20V
50
25
200 MHz
150
f=100MHz
Output Capacitance VCB= -5V, IE=0, f=100KHz 4.5 pF
= -100µA, VCE= -5V
C
=1KΩ
R
S
f=10Hz to 15.7KHz
5dB
Marking
ZD
©2002 Fairchild Semiconductor Corporation Rev. A2, November 2002
Package Dimensions
0.40
±0.03
KST4125
SOT-23
0.20 MIN
0.45~0.60
0.95
2.90
±0.03
1.90
±0.10
0.95
±0.03
±0.03
±0.10
0.40
±0.03
0.97REF 1.30
0.508REF
±0.10
2.40
0.96~1.14
0.03~0.10
0.38 REF
+0.05
0.12
–0.023
Dimensions in Millimeters
©2002 Fairchild Semiconductor Corporation Rev. A2, November 2002
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2
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®
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C™
I
Across the board. Around the world.™
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DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY
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NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR
CORPORATION.
As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, or (c) whose failure to perform
when properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to
result in significant injury to the user.
2. A critical component is any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet Identification Product Status Definition
Advance Information Formative or In
Design
Preliminary First Production This datasheet contains preliminary data, and
No Identification Needed Full Production This datasheet contains final specifications. Fairchild
Obsolete Not In Production This datasheet contains specifications on a product
©2002 Fairchild Semiconductor Corporation Rev. I1
This datasheet contains the design specifications for
product development. Specifications may change in
any manner without notice.
supplementary data will be published at a later date.
Fairchild Semiconductor reserves the right to make
changes at any time without notice in order to improve
design.
Semiconductor reserves the right to make changes at
any time without notice in order to improve design.
that has been discontinued by Fairchild semiconductor.
The datasheet is printed for reference information only.
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