DMD1028
DMD1028-A
Document Number 6509
Issue 3
Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612.
E-mail: sales@semelab.co.uk Website: http://www.semelab.co.uk
Semelab Plc reserves the right to change test conditions, parameter limits and package dimensions without notice. Information furnished by Semelab is believed
to be both accurate and reliable at the time of going to press. However Semelab assumes no responsibility for any errors or omissions discovered in its use.
Semelab encourages customers to verify that datasheets are current before placing orders.
PDPower Dissipation
BVDSS Drain – Source Breakdown Voltage *
BVGSS Gate – Source Breakdown Voltage*
ID(sat) Drain Current*
Tstg Storage Temperature
TjMaximum Operating Junction Temperature
875W (438W -A Version)
70V
±20V
30A
–65 to 150°C
200°C
MECHANICAL DATA
M
K
J
I
O
N
A
C
(
2p
l
s
)
D
F
E
(
4p
l
s
)
B
G
(
t
y
p
)
P
(
2p
l
s
)
1
54
32
H
GOLD METALLISED
MULTI-PURPOSE SILICON
DMOS RF FET
300W – 28V – 175MHz
PUSH–PULL
APPLICATIONS
•VHF/UHF COMMUNICATIONS
from 1 MHz to 400 MHz
METAL GATE RF SILICON FET
TetraFET
* Per Side
D1
PIN 1 SOURCE (COMMON) PIN 2 DRAIN 1
PIN 3 DRAIN 2 PIN 4 GATE 2
PIN 5 GATE 1
FEATURES
• SUITABLE FOR BROAD BAND APPLICATIONS
• SIMPLE BIAS CIRCUITS
• ULTRA-LOW THERMAL RESISTANCE
• BeO FREE
• LOW Crss
• HIGH GAIN – 16 dB MINIMUM
DIM Millimetres Tol. Inches Tol.
A 15.24 0.50 0.600 0.020
B 10.80 0.13 0.425 0.005
C 45° 5° 45° 5°
D 9.78 0.13 0.385 0.005
E 8.38 0.13 0.330 0.005
F 27.94 0.13 1.100 0.005
G 1.52R 0.13 0.060R 0.005
H 10.16 0.15 0.400 0.006
I 21.84 0.23 0.860 0.009
J 0.10 0.02 0.004 0.001
K 1.96 0.13 0.077 0.005
M 1.02 0.13 0.040 0.005
N 4.45 0.38 0.175 0.015
O 34.04 0.13 1.340 0.005
P 1.63R 0.13 0.064R 0.005
ROHS COMPLIANT
DMD1028
DMD1028-A
Document Number 6509
Issue 3
Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612.
E-mail: sales@semelab.co.uk Website: http://www.semelab.co.uk
Semelab Plc reserves the right to change test conditions, parameter limits and package dimensions without notice. Information furnished by Semelab is believed
to be both accurate and reliable at the time of going to press. However Semelab assumes no responsibility for any errors or omissions discovered in its use.
Semelab encourages customers to verify that datasheets are current before placing orders.
Parameter Test Conditions Min. Typ. Max. Unit
70
6
1
17
4.8
0.1
16
60
20:1
360
180
15
VGS = 0 ID= 100mA
VDS = 28V VGS = 0
VGS = 20V VDS = 0
ID= 10mA VDS = VGS
VDS = 10V ID= 6A
ID= 10mA VDS = VGS
PO= 300W
VDS = 28V IDQ = 2A
f = 175MHz
VDS = 28V VGS = –5V f = 1MHz
VDS = 28V VGS = 0 f = 1MHz
VDS = 28V VGS = 0 f = 1MHz
V
mA
μA
V
mhos
V
dB
%
—
pF
pF
pF
ELECTRICAL CHARACTERISTICS (Tcase = 25°C unless otherwise stated)
Drain–Source Breakdown
Voltage
Zero Gate Voltage
Drain Current
Gate Leakage Current
Gate Threshold Voltage*
Forward Transconductance*
Gate Threshold Voltage
Matching Between Sides
Common Source Power Gain
Drain Efficiency
Load Mismatch Tolerance
Input Capacitance
Output Capacitance
Reverse Transfer Capacitance
RTHj–case Thermal Resistance Junction – Case Max. 0.2°C / W
0.4 °C / W -A Version
THERMAL DATA
* Pulse Test: Pulse Duration = 300 μs , Duty Cycle ≤2%
TOTAL DEVICE
PER SIDE
PER SIDE
BVDSS
IDSS
IGSS
VGS(th)
gfs
VGS(th)match
GPS
η
VSWR
Ciss
Coss
Crss
DMD1028
DMD1028-A
Document Number 6509
Issue 3
Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612.
E-mail: sales@semelab.co.uk Website: http://www.semelab.co.uk
Semelab Plc reserves the right to change test conditions, parameter limits and package dimensions without notice. Information furnished by Semelab is believed
to be both accurate and reliable at the time of going to press. However Semelab assumes no responsibility for any errors or omissions discovered in its use.
Semelab encourages customers to verify that datasheets are current before placing orders.
050 100 150 200 250 300 350
Pout W
0
5
10
15
20
25
Gain
dB
Gain (dB)
Vds = 28V
Idq = 2A
f =175MHz
050 100 150 200 250 300 350
Pout W
0
10
20
30
40
50
60
70
80
90
Efficiency %
Efficiency (%)
Vds = 28V
Idq = 2A
f =175MHz
Figure 1 – Gain vs. Power Output. Figure 2 – Efficiency vs. Power Output.
050 100 150 200
250
300
350
Pout
W PEP
-60
-50
-40
-30
-20
-10
dBc
IMD3 (dBc)
f1
= 175 MHz
f2
= 175.1 MHz
Vds
= 28V
Idq
= 2A
Figure 3 – IMD vs. Power Output
DMD1028
DMD1028-A
Document Number 6509
Issue 3
Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612.
E-mail: sales@semelab.co.uk Website: http://www.semelab.co.uk
Semelab Plc reserves the right to change test conditions, parameter limits and package dimensions without notice. Information furnished by Semelab is believed
to be both accurate and reliable at the time of going to press. However Semelab assumes no responsibility for any errors or omissions discovered in its use.
Semelab encourages customers to verify that datasheets are current before placing orders.
0
5
10
15
20
25
30
35
40
0.00 5.00 10.00 15.00 20.00 25.00 30.00 35.00
VDS (V)
IDS (A)
V
g
=13 V
V
g
=12 V
V
g
=11 V
V
g
=10 V
V
g
=9V
V
g
=8 V
V
g
=7 V
V
g
=6 V
V
g
=5 V
1
10
100
1000
0 5 10 15 20 25 30
Vds V
Capacitance pF
Output capacitance
Input Capacitance
Reverse transfer capacitance
Figure 4 – Typical IV Characteristics.
Figure 5 – Typical CV Characteristics.
DMD1028
DMD1028-A
Document Number 6509
Issue 3
Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612.
E-mail: sales@semelab.co.uk Website: http://www.semelab.co.uk
Semelab Plc reserves the right to change test conditions, parameter limits and package dimensions without notice. Information furnished by Semelab is believed
to be both accurate and reliable at the time of going to press. However Semelab assumes no responsibility for any errors or omissions discovered in its use.
Semelab encourages customers to verify that datasheets are current before placing orders.
T2
T3
DMD1028
DMD1028
T4
T6
T5
T1 1u
1u
2-18 pF 47pF
680pF
680pF
2-18 pF
12 1n
L2
L1
10k
1n 100k
Gate-Bias 28V
100n 1n 1000u
100n
90
pF
DMD1028 175MHz TEST FIXTURE
Substrate 1.6mm PTFE/glass, Er=2.5
All microstrip lines W=4.4mm
T1,2,3 7cm Storm Products EXE18 19/30 S1TW coaxial cable on Siemens
B62152A1X1 2-hole core.
T4,5 14cm Storm Products EXE18 19/30 S1TW coaxial cable.
T6 11cm Storm Products EXE18 19/30 S1TW coaxial cable
L1 6 turns 1.2mm dia wire, 5mm internal diameter
L2 1.5 turns 0.9mm dia wire on Siemens A1 x 1 2 hole core