Low Capacitance Plastic Packaged PIN Diodes
SMP1321 Series
Typical Performance Data
100
100
Series Resistance (Ω)
Forward Current (mA)
0.1
1
10
100
10
10
1
1
0.1
0.1
0.01
0.01
400
500
600
700
800
900
1000
Forward Current (mA)
Forward Voltage (mV)
Series Resistance vs. Current @ 100 MHz
0.8
0.7
800
700
DC Characteristic
Capacitance (pF)
0.5
0.4
0.3
0.2
0.1
0
0
1
2
5
10
20
50
1 MHz–1 GHz
Conductance (µS)
0.6
600
500
400
300
200
100
0
0V
10 V
40 V
0
500
1000
1500
2000
Reverse Voltage (V)
Frequency (MHz)
Capacitance vs. Reverse Voltage
Conductance vs. Frequency
and Reverse Voltage
Resistance vs. Temperature @ 500 MHz
I
F
(mA)
0.02
0.10
0.30
0.50
1.00
10.00
20.00
100.00
R
-55°C
Ω
(Ω)
47.400
12.000
5.200
3.600
2.400
1.030
0.871
0.669
R
-15°C
Ω
(Ω)
50.000
12.600
5.400
3.800
2.500
1.040
0.888
0.659
R
+25°C
Ω
(Ω)
56.300
13.900
5.800
4.100
2.600
1.040
0.873
0.642
R
+65°C
Ω
(Ω)
61.500
15.400
6.400
4.500
2.800
1.070
0.889
0.645
R
+100°C
Ω
(Ω)
65.100
16.400
6.900
4.800
3.100
1.150
0.956
0.695
SMP1321-007
In the -007 configuration of the SOT-23 package, the package
inductance is effectively reduced to 0.4 nH, in comparison to
the 1.5 nH value of the standard configuration. This lower
inductance will be particularly beneficial when the diodes are
used as shunt connected switches at frequencies higher than
500 MHz, where inductance is the primary limitation on
maximum switch isolation.
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 shown in the
Gap
figure. Because of the
polarity of the diode
junction, this low inductance
feature is only realizable with
the cathode connected to
Ground
ground.
2
Alpha Industries, Inc.
[781] 935-5150
•
Fax
[617] 824-4579
•
Email
sales@alphaind.com
•
www.alphaind.com
Specifications subject to change without notice. 1/01A
ALPHA [ ALPHA INDUSTRIES ]
