Applications
• Series/shunt elements
in high power HF/VHF/
UHF transmit/receive
(T/R) switches
High Power PIN Diodes
Description
Skyworks’ SMP1324-087LF, SMP1371-087LF and SMP1302-085LF PIN diodes are
designed for use in high-power-handling switches from 1–900 MHz. SMP1324-087LF
and SMP1371-087LF are optimized for use as series diodes. SMP1302-085LF is optimized
for use as a shunt diode. Due to their thermally-enhanced package designs, these diodes
have very low thermal resistance which enables them to handle very large input power.
The SMP1345-087LF is ideally suited for use as a high isolation, series switching
element. The SMP1345-087LF has a 10 micron nominal I layer thickness, which enables
it to switch impedance very rapidly while handling large input signals, when the exposed
paddle of the diode is connected to a printed circuit board which provides an adequately
large thermal conductance to a heatsink to maintain the die temperature to be less than
150 °C. Minority carrier lifetime is 100 ns typical, series resistance at 10 mA bias current is
1.5
Ω
typical and total capacitance is less than 0.2 pF maximum.
The SMP1371-087LF has a 12 micron nominal I layer thickness, which enables it to
handle input signals up to 23 W CW when the device is mounted as a series element in
a switch built on a printed circuit board which has a relatively high thermal conductance,
such as Rogers 5880. In the identical circuit constructed on FR4 printed circuit board
material the maximum input power is 20 W CW. Minority carrier lifetime is 200 ns
minimum, series resistance at 10 mA bias current is 0.5
Ω
maximum and total capacitance
is 0.9 pF typical. The SMP1371-087LF is rated to dissipate 2 W maximum.
The SMP1324-087LF has a 100 micron nominal I layer thickness, which enables it
to handle input signals up to 35 W CW when the device is mounted as a series element in
a switch built on a printed circuit board which has a relatively high thermal conductance,
such as Rogers 5880. In the identical circuit constructed on FR4 printed circuit board
material the maximum input power is 30 W CW. Minority carrier lifetime is 6 µs typical,
series resistance at 50 mA bias current is 0.4
Ω
typical and total capacitance is 0.9 pF
typical. The SMP1324-087LF is rated to dissipate 2 W maximum.
The SMP1302-085LF is ideally suited for use as a shunt switching element. The
SMP1302-085LF has a 50 micron nominal I layer thickness, which enables it to handle
input signals as large as 50 W CW when the exposed paddle of the diode is connected
to a printed circuit board which provides an adequately large thermal conductance to
a heat sink to maintain the die temperature to be less than 150 °C. Minority carrier
lifetime is 700 ns typical, series resistance at 100 mA bias current is 1
Ω
typical and total
capacitance is less than 0.3 pF.
Design information for high power switches may be found in the Skyworks
Application Note,
Design with PIN Diodes,
document number 200312.
Features
• Very low thermal
resistance for excellent
power handling: 40
W
C/W typical
• Low series resistance
– SMP1324-087LF:
0.4
W
@ 50 mA
– SMP1371-087LF:
0.5
W
@ 10 mA
– SMP1302-085LF:
1.5
W
@ 100 mA
• Suitable as series
elements in high
power switches
– SMP1324-087LF:
35 W CW
– SMP1371-087LF:
23 W CW
– SMP1345-087LF:
10W CW
• Suitable as shunt
elements in high
power switches
– SMP1302-085LF:
50 W CW
• Excellent distortion
performance
• Lead (Pb)-free, RoHS-
compliant, Green™
QFN 2 x 2 mm
packages
• ESD Class 1 C, human
body model
Skyworks Green™ products are compliant with all applicable materials leg-
islation and are halogen-free. For additional information, refer to
Skyworks
Definition of Green™,
document number SQ04-0074.
SKYWORKS [ SKYWORKS SOLUTIONS INC. ]
