1.6 GHz SATCOM APPLICAT IONS
RF & MICROWAVE TRANSISTORS
.400 SQ . 2LFL (M186)
epoxy sealed
.1.65 GHz
.28 VOLTS
.EFFICIENCY 40% MIN.
.CLASS C OPERATIO N
.COMMON BASE
.P
OUT
=
32 W MIN. WITH 9 dB GAIN
DESCR IPT ION
The SD1898 is a 28 V Class C silicon NPN tran-
sistor designed for INMARSAT and other 1.65 GHz
SATCOM applications. A gold metallized emitter-
ballasted die geometry is employed providing high
gain and efficiency while ensuring long term re-
liability and ruggedness under severe operating
conditions. SD1898 is packaged in a cost-effective
epoxy sealed housing.
PIN CO NNECTION
BRANDING
1898
ORDER CODE
SD1898
ABSOLUTE MAXIMUM RATINGS (T
case
= 25
°
C)
Symbo l Parameter Value Un i t
V
CBO
Collector-Base Voltage 45 V
V
CEO
Collector-Emitter Voltage 15 V
V
EBO
Emitter-Base Voltage 3.5 V
I
C
Device Current 7.8 A
P
DISS
Power Dissipation 87.5 W
T
J
Junction Temperature +200
°
C
T
STG
Storage Temperature
−
65 to +150
°
C
R
TH(j-c)
Junction-Case Thermal Resistance 2.0 °C/W
SD1898
1. Collector 3. Emitter
2. Base 4. Base
TH ERMA L DA TA
November 1992
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