Skyworks Solutions, Inc. [978] 241-7000
Fax [978] 241-7906 Email sales@skyworksinc.com www.skyworksinc.com
1
Specifications subject to change without notice. 9/01A
Hyperabrupt Junction Tuning Varactor
Features
Low Series Resistance
High Capacitance Ratio at Low
Reverse Voltage
Ultra Small SC-79 Package
Designed for High Volume, Low Cost
Battery Applications
Available in Tape and Reel Packaging
SMV1238-079
Description
The SMV1238-079 is a silicon hyperabrupt junction varactor
diode. The specified high capacitance ratio of this varactor
makes it attractive for wideband VCO applications.
Characteristic
Value
Reverse Voltage (V
R
)
30 V
Forward Current (I
F
)
20 mA
Power Dissipation (P
D
)
250 mW
Storage Temperature (T
ST
)
-55C to +150C
Operating Temperature (T
OP
)
-55C to +125C
Absolute Maximum Ratings
Parameter
Condition
Min.
Typ.
Max.
Unit
Reverse Current (I
R
)
V
R
= 24 V
20.0
nA
Capacitance (C
T
)
C
T
@ 1.0 V, V
R
= 1.0 V, F = 1 MHz
36.0
42.0
pF
Capacitance (C
T
)
C
T
@ 28 V, V
R
= 28 V, F = 1 MHz
2.4
3.0
pF
Capacitance Ratio (C
TR
)
C
T
(1.0 V)/C
T
(28 V)
12.0
Series Resistance (R
S
)
V
R
= 5 V, F = 500 MHz
0.75
0.85
Breakdown Voltage (V
BR
)
I
R
= 10
A
30.0
V
Electrical Specifications at 25C
Hyperabrupt Junction Tuning Varactor
SMV1238-079
2
Skyworks Solutions, Inc. [978] 241-7000
Fax [978] 241-7906 Email sales@skyworksinc.com www.skyworksinc.com
Specifications subject to change without notice. 9/01A
Capacitance vs. Reverse Voltage
Reverse Voltage (V)
Capacitance (pF)
0
10
20
30
40
50
60
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28
Typical Performance Data
0.060 (1.50 mm) MIN.
0.067 (1.70 mm) MAX.
0.010
(0.25 mm) MIN.
0.014
(0.35 mm) MAX.
0.043 (1.10 mm) MIN.
0.051 (1.30 mm) MAX.
0.020
(0.50 mm) MIN.
0.028
(0.70 mm) MAX.
0.003
(0.07 mm) MIN.
0.008
(0.20 mm) MAX.
10 MAX.
10 MAX.
0.028
(0.70 mm) MIN.
0.035
(0.90 mm) MAX.
0.006 (0.15 mm) MIN.
CATHODE
INDICATOR
1
2
SC-79
DIODE
Varactor_Diode
AREA = 1
MODEL = Diode_Model
MODE = nonlinear
RES
R
S
R = R
S
IND
L
S
L = L
S
CAP
C
P
C = C
P
PORT
P_anode
port = 1
PORT
P_Cathode
port = 2
DIODEM
Diode_Model
I
S
= 1.00e-14
R
S
= 0
N = 1
T
T
= 0
C
JO
= C
JO
M = M
V
J
= V
J
E
G
= 1.11
X
TI
= 3
K
F
=0
A
F
=1
F
C
= 0.5
B
V
= 0
I
BV
= 1e-3
I
SR
= 0
N
R
= 2
I
KF
= 0
N
BV
= 1
I
BVL
= 0
N
BVL
= 1
T
BV1
= 0
T
NOM
= 27
F
FE
= 1
SPICE Model
V
R
(V)
C
T
(pF)
0
56.0
0.5
46.5
1.0
38.4
1.5
34.0
2.0
29.5
2.5
27.0
3.0
24.0
4.0
19.5
5.0
15.7
6.0
12.4
7.0
9.8
8.0
8.2
9.0
6.9
10.0
6.2
15.0
4.0
20.0
3.3
25.0
2.9
28.0
2.6
Part
C
J0
V
J
M
C
P
R
S
L
S
Number
(pF)
(V)
(pF)
(
))
(nH)
SMV1238-079
56
6.0
2.4
1.2
0.75
0.7
Capacitance vs. Voltage
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