BF494 NPN RF Transistor
July 2006
BF494
NPN RF Transistor
tm
TO-92
1. Collector 2. Emitter 3. Base
T
a
= 25°C unless otherwise noted
Absolute Maximum Ratings *
Symbol
V
CEO
V
CBO
V
EBO
I
C
T
J
T
STG
Collector-Emitter Voltage
Collector-Base Voltage
Emitter-Base Voltage
Collector Current - Continuous
Junction Temperature
Storage Temperature Range
Parameter
Value
20
30
5.0
30
150
- 55 ~ 150
Unit
V
V
V
mA
°C
°C
* These ratings are limiting values above which the serviceability of any semiconductor device may be impaired.
NOTES:
1) These ratings are based on a maximum junction temperature of 150 degrees C.
2) These are steady state limits. The factory should be consulted on applications involving pulsed or low duty cycle operations
Thermal Characteristics
Symbol
P
D
R
θJC
R
θJA
Parameter
Total Device Dissipation, by R
θJA
Derate above 25°C
Thermal Resistance, Junction to case
Thermal Resistance, Junction to Ambient
T
C
= 25°C unless otherwise noted
Value
350
2.8
125
357
Unit
mW
mW/°C
°C/W
°C/W
Electrical Characteristics*
Symbol
V
(BR)CEO
V
(BR)CBO
V
(BR)EBO
I
CES
h
FE
V
CE
(sat)
V
BE
(sat)
V
BE
(ON)
Parameter
Collector-Emitter Breakdown Voltage
Collector-Base BreakdownVoltage
Emitter-Base Breakdown Voltage
Collector-Emitter Sustaining Current
DC Current Gain
Collector-Emitter Saturation Voltage
Base-Emitter Saturation Voltage
Base-Emitter On Voltage
Conditions
I
C
= 1.0mA, I
B
= 0
I
C
= 10µA, I
E
= 0
I
E
= 10µA, I
C
= 0
V
CE
= 40V, V
EB
= 0V
V
CE
= 10V, I
C
= 1mA
I
C
= 10mA, I
B
= 5mA
I
C
= 10mA, I
B
= 5mA
V
CE
= 10V, I
C
= 10mA
Min.
20
30
5.0
Max.
Units
V
V
V
10
67
222
0.2
0.92
650
740
nA
V
V
mV
* DC Item are tested by Pulse Test: Pulse Width≤300us, Duty Cycle≤2%
©2006 Fairchild Semiconductor Corporation
1
www.fairchildsemi.com
BF494 Rev. A
BF494 NPN RF Transistor
BF494 NPN RF Transistor
TRADEMARKS
The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended to
be an exhaustive list of all such trademarks.
ACEx™
ActiveArray™
Bottomless™
Build it Now™
CoolFET™
CROSSVOLT™
DOME™
EcoSPARK™
E
2
CMOS™
EnSigna™
FACT™
FAST
®
FASTr™
FPS™
FRFET™
FACT Quiet Series™
GlobalOptoisolator™
GTO™
HiSeC™
I
2
C™
i-Lo™
ImpliedDisconnect™
IntelliMAX™
ISOPLANAR™
LittleFET™
MICROCOUPLER™
MicroFET™
MicroPak™
MICROWIRE™
MSX™
MSXPro™
Across the board. Around the world.™
The Power Franchise
®
Programmable Active Droop™
OCX™
OCXPro™
OPTOLOGIC
®
OPTOPLANAR™
PACMAN™
POP™
Power247™
PowerEdge™
PowerSaver™
PowerTrench
®
QFET
®
QS™
QT Optoelectronics™
Quiet Series™
RapidConfigure™
RapidConnect™
µSerDes™
ScalarPump™
SILENT SWITCHER
®
SMART START™
SPM™
Stealth™
SuperFET™
SuperSOT™-3
SuperSOT™-6
SuperSOT™-8
SyncFET™
TCM™
TinyBoost™
TinyBuck™
TinyPWM™
TinyPower™
TinyLogic
®
TINYOPTO™
TruTranslation™
UHC™
UltraFET
®
UniFET™
VCX™
Wire™
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 LIABILITY ARISING OUT OF THE APPLICATION OR USE
OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN;NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE
RIGHTS OF OTHERS. THESE SPECIFICATIONS DO NOT EXPAND THE TERMS OF FAIRCHILD’S WORLDWIDE TERMS AND CONDITIONS, SPE-
CIFICALLY THE WARRANTY THEREIN, WHICH COVERS THESE PRODUCTS.
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
Advance Information
Product Status
Formative or In Design
Definition
This datasheet contains the design specifications for
product development. Specifications may change in
any manner without notice.
This datasheet contains preliminary data, and
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.
This datasheet contains final specifications. Fairchild
Semiconductor reserves the right to make changes at
any time without notice in order to improve design.
Preliminary
First Production
No Identification Needed
Full Production
Obsolete
Not In Production
This datasheet contains specifications on a product
that has been discontinued by Fairchild semiconductor.
The datasheet is printed for reference information only.
Rev. I20
3
BF494 Rev. A
www.fairchildsemi.com
京公网安备 11010802033920号
EEWORLD
