TOC
Tuning Varactors
30 VOLT ABRUPT JUNCTION VARACTOR DIODES
DESCRIPTION
The GC1500 series varactors are silicon abrupt junction
devices. They offer the highest Q and lowest series resis-
tance available in a 30 Volt silicon varactor.
RATINGS
Minimum Voltage Breakdown: 30 V at 10µA
Maximum Leakage Current at:
25 V and 25ºC
0.02 µA
25 V and 125ºC
2.00 µA
Capacitance-Temp. Coefficient: 300 ppm/ºC at V
R
=-4V
Operating Temperature:
Storage Temperature:
-55ºC to +150ºC
-65ºC to +200ºC
APPLICATIONS
The GC1500 series varactors are used for narrow to
moderate band width tuning. They are available in val-
ues appropriate for VHF through KU band frequencies.
These devices are best used in low phase noise voltage
controlled oscillators, low loss voltage variable filters
and phase shifters.
Standard capacitance tolerance is ±10% Other capaci-
tance values and custom mechanical configurations are
also available. All specifications shown are based on
style 30 package and include .18 pF case capacitance.
Consult package outline section of this catalog for other
case styles available. Complete electrical and mechani-
cal data is also provided.
Typical Junction Capacitance vs Reverse Bias
SEMICONDUCTOR OPERATION
75 T
echnology Drive Lowell, MA 01851 T
el: 978-442-5600 Fax: 978-937-3748
15
TOC
Tuning Varactors
30 VOLT ABRUPT JUNCTION VARACTOR DIODES
ELECTRICAL SPECIFICATIONS: T
A
= 25°C
MODEL NUMBER
1
GC1500A
4
GC1500B
GC1500
GC1501
GC1502
GC1503
GC1504
GC1505
GC1506
GC1507
GC1508
GC1509
GC1510
GC1511
GC1512
GC1513
NOTES:
1. When ordering, specify the desired case style by adding its number as a suffix to the model number
.
Some limitations apply - consult factory for details.
.
2. These values include a package capacitance of .18 P
.
3. Q is calculated from: Q=
2
1
TOTAL CAPACITANCE
2
(AT-4V, 1 MHz)
Ct-4 (pF)
0.4
0.6
0.8
1.0
1.2
1.5
1.8
2.2
2.7
3.3
3.9
4.7
5.6
6.8
8.2
10.0
QUALITY FACTOR
3
(AT-4V, 50 MHz)
Q-4 (MIN)
5000
4000
3900
3800
3800
3600
3500
3500
3300
3100
2700
2600
2600
2400
2200
2200
CAPACITANCE RATIO
2
C
T0
/C
T30
(MIN)
4.2
3.0
3.3
3.4
3.4
3.5
3.5
3.7
3.7
3.8
3.9
3.9
4.0
4.0
4.0
4.2
π
fR
5
C
where f=50 MHz and
j
R
I
= Series resistance measured a 1 GHz using transmission loss techniques. Capacitance is measured at 1 MHz.
4. GC1500A only available in Die Form.
SEMICONDUCTOR OPERATION
75 T
echnology Drive Lowell, MA 01851 T
el: 978-442-5600 Fax: 978-937-3748
16
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