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DATA SHEET
SMV1247-SMV1255 Series: Hyperabrupt Junction Tuning
Varactors
Applications
Low tuning voltage VCOs
High-volume commercial systems
Features
High capacitance ratio: C0.3V/C4.7V = 12 typical
Packages rated MSL1, 260 °C per JEDEC J-STD-020
Description
The SMV1247-SMV1255 group of silicon hyperabrupt junction
varactor diodes is designed for use in Voltage Controlled
Oscillators (VCOs) with a low tuning voltage operation. This group
of varactors is characterized for capacitance and resistance over
temperature.
Table 1 describes the various packages and markings of the
SMV1247 to SMV1255 varactors.
DATA SHEET • SMV1247-SMV1255 VARACTORS
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Table 1. Packaging and Marking
Single Single Single Common Anode Common Cathode Common Cathode Single
SC-79
Green™
SOD-323
Green™
SOT-23 SOT-23 SOT-23 SC-70 SOD-882
Green™
SMV1247-074
Marking: BF3
SMV1247-079LF
Marking: Cathode
SMV1247-011LF
Marking: GF
SMV1247-074LF
Green™
Marking: GF3
SMV1248-079LF
Marking: Cathode
SMV1248-001
Marking: BG1
SMV1248-074
Marking: GG3
SMV1248-001LF
Green™
Marking: GG1
SMV1248-074LF
Green™
Marking: GG3
SMV1248-040LF
Green™
Marking: 8
SMV1249-001
Marking: AF1
SMV1249-003
Marking: AF9
SMV1249-004
Marking: AF3
SMV1249-074
Marking: AF3
SMV1249-079LF
Marking: Cathode
SMV1249-011LF
Marking: EF
SMV1249-001LF
Green™
Marking: EF1
SMV1249-003LF
Green™
Marking: EF9
SMV1249-004LF
Green™
Marking: EF3
SMV1249-074LF
Green™
Marking: EF3
SMV1251-004
Marking: AH3
SMV1251-074
Marking: AH3
SMV1251-079LF
Marking: Cathode
SMV1251-011LF
Marking: EH
SMV1251-001LF
Green™
Marking: EH
SMV1251-004LF
Green™
Marking: EH3
SMV1251-074LF
Green™
Marking: EH3
SMV1253-004
Marking: AJ3
SMV1253-040LF
Green™
Marking: 3
SMV1253-079LF
Marking: Cathode
SMV1253-004LF
Green™
Marking: EJ3
SMV1255-001
Marking: AK1
SMV1255-004
Marking: AK3
SMV1255-040LF
Green™
Marking: 4
SMV1255-079LF
Marking: Cathode
SMV1255-011LF
Marking: EK
SMV1255-001LF
Green™
Marking: EK1
SMV1255-004LF
Green™
Marking: EK3
LS = 0.7 nH LS = 1.5 nH LS = 1.5 nH LS = 1.5 nH LS = 0.45 nH
The Pb-free symbol or “LF” in the part number denotes a lead-free, RoHS-compliant package unless otherwise noted as Green™. Tin/lead (Sn/Pb) packaging is not recommended
for new designs.
Innovation to Go™
Select Linear Products (indicated by ) now available for purchase online.
Electrical and Mechanical Specifications
The absolute maximum ratings of the SMV1247-SMV1255 group
of varactors are provided in Table 2. Electrical specifications are
provided in Table 3. Typical capacitance values are listed in Table
4. Typical performance characteristics of the SMV1247-SMV1255
varactors are illustrated in Figures 1 through 4.
The SPICE model for the SMV1247-SMV1255 varactors is shown
in Figure 5 and the associated model parameters are provided in
Table 5.
Package dimensions are shown in Figures 6 to 14 (even
numbers), and tape and reel dimensions are provided in Figures 7
to 15 (odd numbers).
DATA SHEET • SMV1247-SMV1255 VARACTORS
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Package and Handling Information
Instructions on the shipping container label regarding exposure to
moisture after the container seal is broken must be followed.
Otherwise, problems related to moisture absorption may occur
when the part is subjected to high temperature during solder
assembly.
The SMV1247-SMV1255 group of varactors are rated to Moisture
Sensitivity Level 1 (MSL1) at 260 °C. They can be used for lead or
lead-free soldering. For additional information, refer to the
Skyworks Application Note, Solder Reflow Information, document
number 200164.
Care must be taken when attaching this product, whether it is
done manually or in a production solder reflow environment.
Production quantities of this product are shipped in a standard
tape and reel format.
Table 2. SMV1247-SMV1255 Absolute Maximum Ratings
Parameter Symbol Minimum Typical Maximum Units
Reverse voltage VR 15 V
Forward current IF 20 mA
Power dissipation PDIS 250 mW
Operating temperature TOP 55 +125 °C
Storage temperature TSTG 55 +150 °C
Note: Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other
parameters set at or below their nominal value. Exceeding any of the limits listed here may result in permanent damage to the device.
CAUTION: Although this device is designed to be as robust as possible, Electrostatic Discharge (ESD) can damage this device. This device
must be protected at all times from ESD. Static charges may easily produce potentials of several kilovolts on the human body
or equipment, which can discharge without detection. Industry-standard ESD precautions should be used at all times. The
SMV1247-SMV1255 series varactors are Class 0 Human Body Model (HBM) ESD devices.
Table 3. SMV1247-SMV1255 Electrical Specifications (Note 1)
(TOP = 25 °C, Unless Otherwise Noted)
Part Number CT
@ 0.3 V
(pF)
CT
@ 4.7 V
(pF)
CT
@ 1 V
(pF)
CT
@ 3 V
(pF)
CT @ 0.3 V
CT @ 4.7 V
(Ratio)
CT @ 1 V
CT @ 3 V
(Ratio)
RS @ 3 V,
500 MHz
(Ω)
Q @ 3
V,
50 MHz
Min. Typical Typical Max. Typical Typical Min. Typical Typical Max. Typical
SMV1247 6.5 7 0.7 0.78 4.4 0.95 9.5 10.0 4.6 6.0 1500
SMV1248 15.0 17 1.5 1.70 12.3 2.60 10.8 12.0 4.7 3.3 700
SMV1249 28.0 31 2.6 2.80 18.2 3.40 11.0 12.1 5.3 2.2 600
SMV1251 38.0 42 3.4 3.80 28.1 5.80 11.0 12.2 4.8 1.6 400
SMV1253 48.0 53 4.3 4.80 37.0 7.80 11.0 12.3 4.7 1.4 350
SMV1255 58.0 64 5.2 5.80 43.3 8.50 11.0 12.3 5.1 1.3 350
Note 1: Performance is guaranteed only under the conditions listed in this Table.
Reverse voltage VR (IR = 10 μA) = 15 V minimum
Reverse current IR (VR = 12 V) = 20 nA maximum
DATA SHEET • SMV1247-SMV1255 VARACTORS
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Table 4. Capacitance vs Reverse Voltage
VR
(V)
CT (pF)
SMV1247 SMV1248 SMV1249 SMV1251 SMV1253 SMV1255
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
DATA SHEET • SMV1247-SMV1255 VARACTORS
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Typical Performance Characteristics
Figure 1. Capacitance vs Reverse Voltage
Figure 3. Relative Capacitance Change vs Temperature
Figure 2. Series Resistance vs Reverse Voltage @ 500 MHz
Figure 4. Relative Series Resistance Change vs Temperature
@ 500 MHz
DATA SHEET • SMV1247-SMV1255 VARACTORS
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Figure 5. SPICE Model
Table 5. SPICE Model Parameters
Part Number CJO
(pF)
VJ
(V)
M CP
(pF)
RS
(Ω)
SMV1247 8.47 80 70 0.54 4.9
SMV1248 22.12 138 100 0.87 2.4
SMV1249 36.40 80 70 1.68 1.7
SMV1251 52.48 100 76 2.00 1.4
SMV1253 68.30 100 71 2.00 1.1
SMV1255 80.00 135 100 2.74 1.0
Model was designed to fit measured data in the range of up to 4 V
.
For package inductance (L
S), refer to Table 1.
For more details, refer to the Skyworks Application Note,
Varactor SPICE Model for Approved RF VCO Applications, document number 200315.
DATA SHEET • SMV1247-SMV1255 VARACTORS
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Figure 6. SC-70 Package Dimensions
Figure 7. SC-70 Tape and Reel Dimensions
DATA SHEET • SMV1247-SMV1255 VARACTORS
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Figure 8. SC-79 Package Dimensions
Figure 9. SC-79 Tape and Reel Dimensions
DATA SHEET • SMV1247-SMV1255 VARACTORS
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Figure 10. SOD-323 Package Dimensions
Figure 11. SOD-323 Tape and Reel Dimensions
DATA SHEET • SMV1247-SMV1255 VARACTORS
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Figure 12. SOD-882 Package Dimensions
Figure 13. SOD-882 Tape and Reel Dimensions
DATA SHEET • SMV1247-SMV1255 VARACTORS
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Figure 14. SOT-23 Package Dimensions
Figure 15. SOT-23 Tape and Reel Dimensions
DATA SHEET • SMV1247-SMV1255 VARACTORS
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