Characteristic Value
Reverse Voltage (VR) 15 V
Forward Current (IF) 20 mA
Power Dissipation (PD) 250 mW
Storage Temperature (TST) -55°C to +150°C
Operating Temperature (TOP) -55°C to +125°C
Absolute Maximum Ratings
Alpha Industries, Inc. [781] 935-5150 •Fax [617] 824-4579 •Email sales@alphaind.com •www.alphaind.com 1
Specifications subject to change without notice. 1/00A
Hyperabrupt Tuning Varactors
Features
■High Capacitance Ratio,
C0.3 V/C4.7 V = 12 Typ.
■Multiple Packages SOT-23, SOD-323,
SC-70 and SC-79
■Designed for High Volume Commercial
Applications
■SPICE Models are Available
SMV1247–SMV1255
Description
The SMV1247–SMV1255 series of silicon hyperabrupt
junction varactor diodes are designed for use in VCOs with
low tuning voltage operation. This family of varactors is
characterized for capacitance and resistance over
temperature. SPICE models are provided.
♦Available through distribution.
For other packages or configurations, please contact the factory.
Single Single Single Common Anode Common Cathode Common Anode Common Cathode
SC-79 SOD-323 SOT-23 SOT-23 SOT-23 SC-70 SC-70
♦SMV1247-079 ♦SMV1247-074
♦SMV1248-001
♦SMV1249-079 ♦SMV1249-011 ♦SMV1249-001 ♦SMV1249-003 ♦SMV1249-073
♦SMV1251-079 ♦SMV1251-011 ♦SMV1251-001 ♦SMV1251-004 ♦SMV1251-074
♦SMV1253-079 ♦SMV1253-004
♦SMV1255-079 ♦SMV1255-011 ♦SMV1255-001 ♦SMV1255-003 ♦SMV1255-004 ♦SMV1255-073
LS= 0.7 nH LS= 1.5 nH LS= 1.5 nH LS= 1.5 nH LS= 1.5 nH LS= 1.4 nH LS= 1.4 nH
Hyperabrupt Tuning Varactors SMV1247–SMV1255
2Alpha Industries, Inc. [781] 935-5150 •Fax [617] 824-4579 •Email sales@alphaind.com •www.alphaind.com
Specifications subject to change without notice. 1/00A
0.1
1.0
10.0
100.0
6.0 8.04.0
Reverse Voltage (V)
Capacitance vs. Reverse Voltage
2.00
Capacitance (pF)
SMV1253
SMV1251
SMV1249
SMV1255
SMV1248
SMV1247
-3
-2
-1
0
1
2
3
-40 -20 0 20 40 60 80
Percentage Change (%)
Temperature (˚C)
Relative Capacitance Change
vs. Temperature
VR = 4 V
VR = 1 V
-50 -25 0 25 50 75 100
Percentage Change (%)
Temperature (˚C)
Relative Series Resistance Change
vs. Temperature @ 500 MHz
-25
-20
-10
-15
-5
0
5
10
15
0
1.0
2.0
3.0
4.0
3.5
2.5
1.5
0.5
Reverse Voltage (V)
Series Resistance vs. Reverse Voltage
@ 500 MHz
01 2 3 45
RS (Ω)
SMV1247
SMV1251
SMV1253
SMV1255
SMV1248
SMV1249
Typical Performance Data
CTCTCTCTCT@ 0.3 V CT@ 1 V RS@ 3 V Q
Part @ 0.3 V @ 4.7 V @ 1 V @ 3 V CT@ 4.7 V CT@ 3 V 500 MHz @ 3 V
Number (pF) (pF) (pF) (pF) (Ratio) (Ratio) (ΩΩ) 50 MHz
Min. Typ. Typ. Max. Typ. Typ. Min. Typ. Typ. Max. Typ.
SMV1247 6.5 7 0.7 0.78 4.4 0.95 9.5 10.0 4.6 2.0 1500
SMV1248 15.0 17 1.5 1.70 12.3 2.60 10.8 12.0 4.7 1.8 700
SMV1249 28.0 31 2.6 2.80 18.2 3.40 11.0 12.1 5.3 1.5 600
SMV1251 38.0 42 3.4 3.80 28.1 5.80 11.0 12.2 4.8 1.3 400
SMV1253 48.0 53 4.3 4.80 37.0 7.80 11.0 12.3 4.7 1.2 350
SMV1255 58.0 64 5.2 5.80 43.3 8.50 11.0 12.3 5.1 1.0 350
Electrical Specifications at 25°C
Reverse Voltage VR(IR= 10 µA): 15 V
Reverse Current IR(VR= 12 V): 20 nA
Hyperabrupt Tuning Varactors SMV1247–SMV1255
Alpha Industries, Inc. [781] 935-5150 •Fax [617] 824-4579 •Email sales@alphaind.com •www.alphaind.com 3
Specifications subject to change without notice. 1/00A
Part CJO VJMC
PRS
Number (pF) (V) (pF) (ΩΩ)
SMV1247 9.22 13 10.5 0 2.0
SMV1248 21.54 17 14.0 0 1.8
SMV1249 39.00 17 14.0 0 1.5
SMV1250 47.00 17 14.0 0 1.5
SMV1251 60.00 17 14.0 0 1.3
SMV1253 70.00 17 14.0 0 1.2
SMV1255 82.00 17 14.0 0 1.0
Typical Capacitance Values
SPICE Model
SMV1247 SMV1248 SMV1249 SMV1251 SMV1253 SMV1255
VR(V) CT(pF) CT(pF) CT(pF) CT(pF) CT(pF) CT(pF)
0.0 8.86 22.62 37.35 53.65 69.32 81.21
0.5 6.17 16.32 25.88 38.23 50.23 58.28
1.0 4.37 12.33 18.18 28.09 37.07 43.27
1.5 2.96 9.12 12.08 20.13 27.57 31.49
2.0 1.88 6.27 7.27 13.55 19.37 21.50
2.5 1.22 3.93 4.44 8.60 12.39 13.40
3.0 0.95 2.57 3.40 5.78 7.77 8.51
3.5 0.83 1.95 2.96 4.57 5.77 6.51
4.0 0.77 1.71 2.72 3.95 4.86 5.58
4.5 0.73 1.59 2.51 3.58 4.34 5.07
5.0 0.70 1.49 2.38 3.33 4.01 4.76
5.5 0.68 1.44 2.30 3.16 3.78 4.58
6.0 0.67 1.40 2.24 3.03 3.62 4.46
6.5 0.66 1.36 2.19 2.94 3.50 4.39
7.0 0.65 1.33 2.14 2.88 3.41 4.33
7.5 0.64 1.31 2.09 2.83 3.34 4.29
8.0 0.64 1.30 2.03 2.79 3.28 4.26
1. Values extracted from measured performance.
2. For package inductance (LS) refer to package type.
3. For more details refer to the “Varactor SPICE Models for RF VCO
Applications”Application Note.
DIODE
Varactor_Diode
AREA = 1
MODEL = Diode_Model
MODE = nonlinear
RES
RS
R = RS
IND
LS
L = LS
CAP
CP
C = CP
PORT
P_anode
port = 1
PORT
P_Cathode
port = 2
DIODEM
Diode_Model
IS = 1.00e-14
RS = 0
N = 1
TT = 0
CJO = CJO
M = M
EG = 1.11
XTI = 3
KF =0
AF =1
FC = 0.5
BV = 0
IBV = 1e-3
ISR = 0
NR = 2
IKF = 0
NBV = 1
IBVL = 0
NBVL = 1
TBV1 = 0
TNOM = 27
FFE = 1
Hyperabrupt Tuning Varactors SMV1247–SMV1255
4Alpha Industries, Inc. [781] 935-5150 •Fax [617] 824-4579 •Email sales@alphaind.com •www.alphaind.com
Specifications subject to change without notice. 1/00A
SOT-23
3
2
1
0.035 (0.89 mm) MIN.
0.044 (1.12 mm) MAX.
0.0005 (0.01 mm) MIN.
0.004 (0.10 mm) MAX.
0.012 (0.30 mm) MIN.
0.020 (0.50 mm) MAX.
0.003 (0.080 mm) MIN.
0.008 (0.20 mm) MAX.
8˚ MAX.
0.022 (0.55 mm) REF.
0.110 (2.80 mm) MIN.
0.120 (3.04 mm) MAX.
0.083 (2.10 mm) MIN.
0.104 (2.64 mm) MAX.
0.037 (0.95 mm) REF.
0.047 (1.20 mm) MIN.
0.055 (1.40 mm) MAX.
0.076 (1.92 mm) REF.
0.020 (0.51 mm) REF.
SOD-323
0.090 (2.30 mm) MIN.
0.108 (2.74 mm) MAX.
0.045 (1.15 mm) MIN.
0.053 (1.35 mm) MAX.
0.050
(1.25 mm) MAX.
0.006
(0.15 mm) TYP.
0.008 (0.20 mm) NOM.
0.004 (0.10 mm) MAX.
0.010 (0.25 mm) MIN.
0.010
(0.25 mm) MIN.
0.016
(0.40 mm) MAX.
0.063 (1.60 mm) MIN.
0.071 (1.80 mm) MAX.
CATHODE
INDICATOR
21
SC-79
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
12
SC-70
3
2
1
0.031 (0.80 mm) MIN.
0.039 (1.00 mm) MAX.
0.000 (0.00 mm) MIN.
0.004 (0.10 mm) MAX.
0.010 (0.25 mm) MIN.
0.016 (0.40 mm) MAX.
0.071 (1.80 mm) MIN.
0.087 (2.20 mm) MAX.
0.071 (1.80 mm) MIN.
0.094 (2.40 mm) MAX.
0.045 (1.15 mm) MIN.
0.053 (1.35 mm) MAX.
0.026 (0.65 mm) REF.
0.051 (1.30 mm) REF.
0.004 (0.10 mm) MIN.
0.007 (0.18 mm) MAX.
0.004 (0.10 mm) MIN.
0.012 (0.30 mm) MAX.
0.014 (0.35 mm) REF.
