RF & MICROWAVE TRANSISTORS
SATELLITE COMMUNICATIONS APPLICATIONS
.250 x .320 2LFL (M170)
epoxy sealed
.
CLASS C
.
1.6 GHz
.
COMMON BASE
.
REFRACTORY/GOLD METALLIZATION
.
EFFICIENCY
=
50% MIN.
.
P
OUT
=
4.5 W MIN. WITH 10 dB GAIN
DESCRIPTION
The SD1894 is a common base silicon NPN bipolar
device optimized for 1.6 GHz SATCOM applica-
tions.
The SD1894 offers superior gain and collector effi-
ciency, making it an ideal choice for Class C power
amplifiers used in portable as well as fixed SAT-
COM terminals.
PIN CONNECTION
BRANDING
SD1894
ORDER CODE
SD1894
ABSOLUTE MAXIMUM RATINGS (T
case
=
25
C)
Symbol
Parameter
Valu e
Uni t
V
CBO
Collector-Base Voltage
45
V
V
CES
Collector-Emitter Voltage
45
V
V
EBO
Emitter-Base Voltage
3.0
V
I
C
Device Current
375
mA
P
DISS
Power Dissipation
12.5
W
T
J
Junction Temperature
+200
C
T
STG
Storage Temperature
-
65 to +150
C
R
TH(j-c)
Junction-Case Thermal Resistance
14.0
C/W
SD1894
1. Collector
3. Base
2. Emitter
THERMAL DATA
February 4, 1997
1/4
TEST CIRCUIT
C1 : .6 - 4.5 pf Johanson
C2 : 39pf ATC Chip Capacitor
C3 : .1
f Ceramic
L1 : 10 Turns, AWG #28, .080"I.D.
L2 : 4 Turns, AWG #28, .)80" I.D.
Board Material: Er
=
10.2, Thickness .050"
TYPICAL INPUT
IMPEDANCE
TYPICAL COLL ECTOR LOAD
IMPEDANCE
IMPEDANCE DATA
Z
IN
Z
CL
FREQ.
Z
IN
(
)
Z
CL
(
)
1600 MHz
31.6 + j 21.4
5.2 + j 14.7
1620 MHz
38.0 + j 15.0
5.6 + j 14.55
1635 MHz
38.8 + j 11.3
5.85 + j 14.45
1650 MHz
36.0 + j 9.1
6.1 + j 14.3
1665 MHz
34.3 + j 8.77
6.37 + j 14.2
SD1894
3/4
PACKAGE MECHANICAL DATA
Ref.: Dwg. No.12-0170
UDCS No. 1010996 rev B
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility
for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics.
Specifi cations 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 authorize d for use as criti cal components in life
support devices or systems without express written approval of SGS-THOMSON Microelectronics.
1997 SGS-THOMSON Microelectronics - All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea
Malaysia - Malta - Morocco - The Netherlands - Singapore - Spain - Sweden - Switzerland
Taiwan - Thailand - United Kingdom - U.S. A.
SD1894
4/4
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