1.6 GHz SATCOM APPLICATIONS
RF & MICROWAVE TRANSISTORS
.400 SQ. 2LFL (M186)
epoxy sealed
.1.65 GHz
.28 VOLTS
.EFFICIENCY 40% MIN.
.CLASS C OPERATION
.COMMON BASE
.P
OUT =
32 W MIN. WITH 9 dB GAIN
DESCRIPTION
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 CONNECTION
BRANDING
1898
ORDER CODE
SD1898
ABSOLUTE MAXIMUM RATINGS (T
case
= 25
°
C)
Symbol Parameter Value Unit
VCBO Collector-Base Voltage 45 V
V
CEO
Collector-Emitter Voltage 15 V
V
EBO
Emitter-Base Voltage 3.5 V
IC Device Current 7.8 A
PDISS Power Dissipation 87.5 W
T
J
Junction Temperature +200
°
C
T
STG
Storage Temperature − 65 to +150
°
C
RTH(j-c) Junction-Case Thermal Resistance 2.0 °C/W
SD1898
1. Collector 3. Emitter
2. Base 4. Base
THERMAL DATA
November 1992
1/4