DATA SHEET
SMP1321 Series: Low Capacitance, Plastic Packaged PIN
Diodes
Applications
High-performance wireless switches
Features
Capacitance: 0.18 pF typical @ 30 V
Series resistance: 1.05 typical @ 10 mA
Packages rated MSL1, 260 C per JEDEC J-STD-020
Description
The SMP1321 series of plastic packaged, surface mountable PIN
diodes is designed for use in high volume switch applications from
10 MHz to more than 10 GHz. The low capacitance of these
diodes (0.25 pF), combined with a low resistance (2.0
maximum at 10 mA), makes the SMP1321 series particularly
suited to high isolation, series-connected PIN diode switches in
battery operated circuits.
The SMP1321 series is available in a selection of plastic packages
and a variety of configurations that include an SC-70, a small
footprint SC-79, a low inductance SOT-23, and a miniature
SOD-882.
Table 1 describes the various packages and marking of the
SMP1321 series.
Skyworks Solutions, Inc. Phone [781] 376-3000 Fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com
200048N Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice September 21, 2012 1 DATA SHEET SMP1321 SERIES DIODES
Table 1. SMP1321 Series Packaging and Marking
Single Common Anode Common Cathode Series Pair Low Inductance Single Single Single
SOT-23 SOT-23 SOT-23 SOT-23 SOT-23 SOD-323 SC-79 SOD-882
Green Green Green
SMP1321-001 SMP1321-003 SMP1321-004 SMP1321-005 SMP1321-007
Marking: PM1 Marking: PM9 Marking: PM3 Marking: PM2 Marking: PMB
SMP1321-001LF SMP1321-003LF SMP1321-004LF SMP1321-005LF SMP1321-007LF SMP1321-011LF SMP1321-079LF SMP1321-040LF
Green Green Green Green Green
Marking: RM Marking: Cathode Marking: C
Marking: RM1 Marking: RM9 Marking: RM3 Marking: RM2 Marking: RMB
LS = 1.5 nH LS = 1.5 nH LS = 1.5 nH LS = 1.5 nH LS = 0.4 nH LS = 1.5 nH LS = 0.7 nH LS = 0.45 nH
SC-70 SC-70 SC-70
SMP1321-073 SMP1321-074 SMP1321-075
Marking: PM9 Marking: PM3 Marking: PM2
SMP1321-073LF SMP1321-074LF SMP1321-075LF
Green Green Green
Marking: RM9 Marking: RM3 Marking: RM2
LS = 1.4 nH LS = 1.4 nH LS = 1.4 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.
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SMP1321 series are provided in Table 2. Electrical specifications
SMP1321-007
are provided in Table 3. Resistance versus temperature
For the -007 configuration of the SOT-23 package, the package
measurements are provided in Table 4.
inductance is effectively reduced to 0.4 nH compared to the
1.5 nH value of the standard configuration. This lower inductance Typical performance characteristics of the SMP1321 series are
is particularly beneficial when the diodes are used as shunt illustrated in Figures 2 to 5. Package dimensions are shown in
connected switches at frequencies higher than 500 MHz in which Figures 6 to 14 (even numbers), and tape and reel dimensions are
inductance is the primary limitation on maximum switch isolation. provided in Figures 7 to 15 (odd numbers).
To achieve the effective 0.4 nH, the SOT-23 package must be
inserted in the microstrip circuit board with a gap in the trace, as
Package and Handling Information
shown in Figure 1. Because of the polarity of the diode junction,
Instructions on the shipping container label regarding exposure to
this low inductance feature is realizable only with the cathode
moisture after the container seal is broken must be followed.
connected to ground.
Otherwise, problems related to moisture absorption may occur
when the part is subjected to high temperature during solder
assembly.
The SMP1321 series is rated to Moisture Sensitivity Level 1
(MSL1) at 260 C. It 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
Figure 1. SOT-23 Package Trace Gap done manually or in a production solder reflow environment.
Production quantities of this product are shipped in a standard
tape and reel format.
Electrical and Mechanical Specifications
The part number and configuration for the SMP1321 series are
provided in Table 1. The absolute maximum ratings of the
Skyworks Solutions, Inc. Phone [781] 376-3000 Fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com
2 September 21, 2012 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice 200048N