Silicon Low Capacitance
Hyperabrupt Junction Varactor Diodes
SMV2019 to SMV2023
Features
Octave Frequency Tuning from 0 to 10 Volts
Good Linearity Tuning Ratio Without
Compensation Network
Offered in Package Styles Suitable for a Wide
Range of Applications
Description
Alpha microwave hyperabrupt diodes are designed
for wideband tuning of microwave filters, resonators,
and local oscillators. Linear tuning, not possible with
conventional abrupt–junction tuning diodes, is
accomplished by maintaining an accurate silicon
doping profile using ion–implantation precision
control techniques.
This series of hyperabrupt diodes offer wide
bandwidth tuning with low bias voltage. For example,
a 22 volt hyperabrupt diode can provide the same
tuning variation as a 90 volt abrupt–junction diode.
When capacitance and tuning ratio values are equal,
a hyperabrupt diode will have a Q (measured at –4
volts, 50 MHz) approximately 1/2 to 1/3 that of an
abrupt–junction diode.
Maximum Ratings
Reverse Voltage, V
R
:
Forward Current, I
F
:
Power Dissipation at 25°C:
Operating Temperature:
Storage Temperature:
22V
100 mA
250 mW
–55 to 150°C
–65 to 200°C
These diodes are available in many Alpha ceramic
packages. They can be supplied in chip form or
mounted on a variety of packages. All chips are
passivated with silicon dioxide for reliability and low
leakage current.
The specifications table indicates chip capacitance
measured at 1 MHz. For packaged varactors add
appropriate package capacitance, e.g., 0.22 pF for
package 210, to obtain total capacitance.
Electrical Specifications at 25°C
Square Passivated Silicon Chips
Part
Number
"
SMV2019–000
SMV2020–000
SMV2021–000
SMV2022–000
"
SMV2023–000
V
B
@ 10
µA
(V)
Min.
22
22
22
22
22
I
R
@ 17.6V
(nA)
Max.
50
50
50
50
50
Min.
0.68
1.13
1.58
2.48
4.28
C
J
@ 4V
(pF)
Max.
0.88
1.43
1.98
3.08
5.28
Min.
0.13
0.23
0.32
0.48
0.78
C
J
@ 20V
(pF)
Max.
0.23
0.33
0.44
0.68
1.08
Q
@ 4V
50 MHz
Min.
500
500
500
400
400
Chip
Outline
Number
N mber
149–801
149–801
149–801
149–801
149–801
"
Available through distribution.
2–10
Alpha Industries
•
[617] 935 5150
•
Fax
[617] 824 4579
•
E-mail
sales@alphaind.com
•
Visit our web site:
www.alphaind.com
Silicon Low Capacitance Hyperabrupt Junction Varactor Diodes
SMV2019 to SMV2023
Ordering Information
The following packages are also available. To order
part in a different package just replace the dash
number with a package style listed below. For
example, SMV2019–000 becomes SMV2019–210.
Available Package Outlines:
202, 203, 204, 210,
219, 230, 240
Refer to the Outline Drawings section in this catalog
for the total selection of outline (package)
dimensions.
2
202
203
204
210
219
230
240
Outline Dimensions
149–801
Alpha Industries
•
[617] 935 5150
•
Fax
[617] 824 4579
•
E-mail
sales@alphaind.com
•
Visit our web site:
www.alphaind.com
2–11
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