SD1898
RF & MICROWAVE TRANSISTORS
1.6 GHz SATCOM APPLICATIONS
.
.
.
.
.
.
1.65 GHz
28 VOLTS
EFFICIENCY 40% MIN.
CLASS C OPERATION
COMMON BASE
P
OUT
=
32 W MIN. WITH 9 dB GAIN
.400 SQ. 2LFL (M186)
epoxy sealed
ORDER CODE
SD1898
BRANDING
1898
PIN CONNECTION
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.
ABSOLUTE MAXIMUM RATINGS
(T
case
=
25
°
C)
Symbol
Parameter
Value
Unit
1. Collector
2. Base
3. Emitter
4. Base
V
CBO
V
CEO
V
EBO
I
C
P
DISS
T
J
T
STG
Collector-Base Voltage
Collector-Emitter Voltage
Emitter-Base Voltage
Device Current
Power Dissipation
Junction Temperature
Storage Temperature
45
15
3.5
7.8
87.5
+200
−
65 to +150
V
V
V
A
W
°
C
°
C
THERMAL DATA
R
TH(j-c)
November 1992
Junction-Case Thermal Resistance
2.0
°C/W
1/4
SD1898
ELECTRICAL SPECIFICATIONS
(T
case
=
25
°
C)
STATIC
Symbol
Test Conditions
Value
Min.
Typ.
Max.
Unit
BV
CBO
BV
CEO
BV
EBO
h
FE
DYNAMIC
Symbol
I
C
=
10mA
I
C
=
10mA
I
E
=
10mA
V
CE
=
5V
I
E
=
0mA
I
B
=
0mA
I
C
=
0mA
I
C
=
2A
45
12
3.5
15
—
—
—
—
—
—
—
150
V
V
V
—
Test Conditions
Value
Min .
Typ.
Max.
Unit
P
OUT
G
P
η
c
f
=
1.65 GHz
f
=
1.65 GHz
f
=
1.65 GHz
P
IN
=
4.0 W
P
IN
=
4.0 W
P
IN
=
4.0 W
V
CE
=
28 V
V
CE
=
28 V
V
CE
=
28 V
32
9.0
40
—
—
—
—
—
—
W
dB
%
TYPICAL PERFORMANCE
POWER OUTPUT vs POWER INPUT
EFFICIENCY vs POWER INPUT
2/4
SD1898
IMPEDANCE DATA
TYPICAL INPUT
IMPEDANCE
Z
IN
FREQ.
1550 MHz
TYPICAL COLLECTOR
LOAD IMPEDANCE
Z
CL
1600 MHz
1650 MHz
Z
IN
(
Ω
)
6.6 + j 15.0
8.3 + j 14.5
12.0 + j 12.0
Z
CL
(
Ω
)
5.6
−
j 2.5
4.7
−
j 1.9
4.1
−
j 1.4
TEST CIRCUIT
C1, C2 : .4 - 2.5pF Johanson Capacitor
C3
: 15,000pF EMI Filter
C4
: 1000pF Chip Capacitor
L1, L2 : 5 Turns Choke Diameter Wire .025” I.D. .125”
Substrate: Er
=
10.2, Height .050”, 1 Oz. Copper
All Dimensions in Inches.
3/4
SD1898
PACKAGE MECHANICAL DATA
Ref.: Dwg. No.12-0186
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use ascritical components in life support devices or systems without express
written approval of SGS-THOMSON Microelectonics.
©
1994 SGS-THOMSON Microelectronics - All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands -
Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A
4/4
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