DATA SHEET
SMV1493-079LF and SMV1494-079LF Plastic Packaged
Abrupt Junction Tuning Varactors
Applications
• High-Q resonators in wireless system VCOs
• High volume commercial systems
Features
• High Q
• Low series resistance for low phase noise
• Ultra-small SC-79 package (MSL1, 260 °C per
JEDEC J-STD-020)
Description
The SMV1493-079LF and SMV1494-079LF silicon abrupt junction
varactor diodes are designed for use in Voltage Controlled
Oscillators (VCOs) requiring tight capacitance tolerances. The low
resistance of these varactors makes them appropriate for high-Q
resonators in wireless system VCOs to frequencies above 2.5 GHz.
Table 1 describes the SC-79 package and markings of the
SMV1493/SMV1494-079LF varactors.
Table 1. Packaging and Marking
Single
SC-79
Green™
SMV1493-079LF
Marking: Cathode
SMV1494-079LF
Marking: Cathode
Ls = 0.7 nH
The Pb-free symbol or “LF” in the part number denotes a lead-free, RoHScompliant package unless otherwise noted as Green™. Tin/lead (Sn/Pb)
packaging is not recommended for new designs.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET • SMV1493-079LF AND SMV1494-079LF VARACTORS
Table 2. SMV1405-SMV1413 Series Absolute Maximum Ratings
Parameter
Symbol
Minimum
Typical
Maximum
Units
15
V
Reverse voltage
VR
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
SMV1493-079LF and SMV1494-079LF varactors are Class 0 Human Body Model (HBM) ESD devices.
Table 3. SMV1493-079LF and SMV1494-079LF Electrical Specifications (Note 1)
(TOP = 25 °C, Unless Otherwise Noted)
CT @ 1 V
(pF)
Part Number
RS @ 1 V,
500 MHz
(Ω)
CT @ 4 V
(pF)
Min.
Max.
Min.
Max.
Max.
SMV1493
17.4
20.0
10.0
12.1
0.50
SMV1494
36.3
41.7
20.7
25.3
0.45
Note 1: Performance is guaranteed only under the conditions listed in this Table.
Reverse voltage VR (IR = 10 μA) = 12 V minimum
Reverse current IR (VR = 10 V) = 20 nA maximum
Electrical and Mechanical Specifications
Package and Handling Information
The absolute maximum ratings of the SMV1493-079LF and
SMV1494-079LF varactors are provided in Table 2. Electrical
specifications are provided in Table 3. Typical capacitance values
are listed in Table 4. Typical capacitance vs reverse voltage
performance for the SMV1494-079LF and SMV1494-079LF
varactors is illustrated in Figure 1.
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 SPICE model for the SMV1493-079LF and SMV1494-079LF
varactors is shown in Figure 2 and the associated model
parameters are provided in Table 5.
Package dimensions are shown in Figure 3, and tape and reel
dimensions are provided in Figure 4.
The SMV1493-079LF and SMV1494-079LF 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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET • SMV1493-079LF AND SMV1494-079LF VARACTORS
Table 4. Capacitance vs Reverse Voltage
VR
(V)
CT (pF)
SMV1493-079LF
SMV1494-079LF
0
28.7
57.8
0.2
25.6
51.5
0.4
23.3
46.9
0.6
21.5
43.4
0.8
20.1
40.5
1.0
19.0
38.4
1.2
17.9
36.3
1.4
17.0
34.6
1.6
16.2
33.0
1.8
15.5
31.6
2.0
15.0
30.6
2.2
14.4
29.5
2.4
13.9
28.5
2.6
13.5
27.6
2.8
13.1
26.7
3.0
12.7
26.1
3.2
12.4
25.3
3.4
12.0
24.7
3.6
11.7
24.1
3.8
11.4
23.5
4.0
11.2
23.1
4.2
10.9
22.6
4.4
10.7
22.1
4.6
10.5
21.7
4.8
10.3
21.3
5.0
10.1
20.9
6.0
9.2
19.2
7.0
8.5
17.9
8.0
8.0
16.7
9.0
7.6
15.7
10.0
7.1
14.7
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
200070I • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 25, 2011
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DATA SHEET • SMV1493-079LF AND SMV1494-079LF VARACTORS
Typical Performance Characteristics
Figure 1. Capacitance vs Reverse Voltage
Figure 2. SPICE Model
Table 5. SPICE Model Parameters
Part Number
CJO
(pF)
VJ
(V)
M
CP
(pF)
RS
(Ω)
SMV1493
28.66
0.88
0.55
0
0.50
SMV1494
57.70
0.83
0.52
0
0.45
Values extracted from measured performance.
For package inductance, LS, refer to Table 1.
For more details, refer to the Skyworks Application Note, Varactor SPICE Model for Approved RF VCO Applications, document number 200315.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET • SMV1493-079LF AND SMV1494-079LF VARACTORS
Figure 3. SC-79 Package Dimensions
Figure 4. SC-79 Tape and Reel Dimensions
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
200070I • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 25, 2011
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DATA SHEET • SMV1493-079LF AND SMV1494-079LF VARACTORS
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