Alpha Industries, Inc. [781] 935-5150 •Fax [617] 824-4579 •Email sales@alphaind.com •www.alphaind.com 1
Specifications subject to change without notice. 3/99A
Directional Coupler 0.81–0.96 GHz
Features
■Low Cost
■Low Profile
■Small SOT-6 Package
■Tape & Reel
DC08-73
Description
The DC08-73 is a monolithic directional coupler tailored
to the 0.81–0.96 GHz band. It offers low loss, good
isolation, good input/output matching and exceptional
coupling repeatability. It may be used at higher
frequencies when stronger coupling is required. It is
available in the SOT-6 leaded surface mount package.
Parameter Min. Typ. Max. Unit
Frequency 0.81 0.96 GHz
Inser tion Loss1.35 .45 dB
Isolation 21 22 dB
Input VSWR 1.05:1 1.3:1
Output VSWR 1.05:1 1.3:1
Coupling 14 15 16 dB
Coupled Por t VSWR 1.2:1 1.3:1
Electrical Specifications at 25°C
123
654
GND
GND
COUPLED
OUT
GND
RF IN
DC08
Pin Out
1
2
3
6
5
4
Block Diagram
1. Coupling loss included.
Alpha Industries, Inc. [781] 935-5150 •Fax [617] 824-4579 •Email sales@alphaind.com •www.alphaind.com 2
Specifications subject to change without notice. 3/99A
Directional Coupler 0.81–0.96 GHz DC08-73
Frequency (GHz)
0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0.0
Insertion Loss (dB)
Insertion Loss vs. Frequency
Frequency (GHz)
-40.0
-30.0
-20.0
-10.0
0.0
Isolation (dB)
Isolation vs. Frequency
0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0
Frequency (GHz)
0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0
1.0
1.1
1.2
1.3
1.4
1.5
Output VSWR
Output VSWR vs. Frequency
Frequency (GHz)
1.0
1.1
1.2
1.3
1.4
1.5
Coupled Port VSWR
Coupled Port VSWR vs. Frequency
0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0
Frequency (GHz)
1.0
1.1
1.2
1.3
1.4
1.5
Input VSWR
Input VSWR vs. Frequency
0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0
Frequency (GHz)
-30.0
-25.0
-20.0
-15.0
-10.0
-5.0
Coupling (dB)
Coupling vs. Frequency
0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0
Typical Performance Data
Directional Coupler 0.81–0.96 GHz DC08-73
Alpha Industries, Inc. [781] 935-5150 •Fax [617] 824-4579 •Email sales@alphaind.com •www.alphaind.com 3
Specifications subject to change without notice. 3/99A
Characteristic Value
Input Power +4 W
Operating Temperature -40°C to +85°C
Storage Temperature -65°C to +150°C
Electrostatic Discharge +125 V
Absolute Maximum Ratings
Note: Exceeding these parameters may cause irreversible damage.
Recommended Board Layout
0.075
0.020
0.018 TYP.
0.015
0.039 TYP.
0.0200 DIA.
VIA 3 PLACES
SOT-6
0.074
(1.90 mm REF.)
0.071 (1.80 mm)
0.052 (1.30 mm)
0.037 (0.95 mm) REF.
0.122 (3.10 mm)
0.106 (2.70 mm)
0.006
(0.15 mm)
0.000
(0.00 mm)
0.057 (1.45 mm)
0.035 (0.90 mm)
0.020 (0.51 mm)
0.014 (0.350 mm)
0.126 (3.20 mm)
0.087 (2.20 mm)
PIN 6
PIN 1
PIN 1
INDICATOR
0.022 (0.61 mm)
0.004 (0.10 mm)
0.014
(0.26 mm)
0.004
(0.10 mm)
0.012
(0.30 mm)
TYP.
5.0˚ ± 1˚
5.0˚ ± 1˚
Material is 10 mil FR4.
