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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

Low Resistance Low Capacitance Plastic Packaged PIN Diodes

SMP1320 Series

Series Resistance vs. Current @ 100 MHz

0.1

0.01

0.1

1

10

100

1

10

100

Forward Current (mA)

Capacitance vs. Reverse Voltage

Reverse Voltage (V)

0

0.1

0.2

0.3

0.4

0.5

0

1

2

5

10

20

50

1 MHz–1 GHz

400

500

600

700

800

900

1000

DC Characteristic

0.01

0.1

1

10

100

Forward Voltage (mV)

0

500

1000

1500

2000

Conductance vs. Frequency

and Reverse Voltage

0

100

200

300

400

500

600

Frequency (MHz)

0 V

10 V

40 V

Typical Performance Data

-55°C

-15°C

+25°C

+65°C

+100°C

(mA)

(

Ω

Ω)(Ω

Ω)(Ω

Ω)(Ω

Ω)(Ω

Ω)

0.02

29.60

29.20

30.80

32.00

32.70

0.10

7.20

7.70

8.30

8.80

8.80

0.30

3.40

3.60

3.80

4.00

4.10

0.50

2.50

2.70

2.80

2.90

3.00

1.00

1.70

1.80

1.90

2.00

1.90

10.00

0.84

0.85

0.76

0.76

0.67

20.00

0.73

0.73

0.64

0.64

0.56

100.00

0.59

0.57

0.47

0.48

0.40

Resistance vs. Temperature @ 500 MHz

SMP1320-007

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

figure. Because

of

the

polarity of the diode junction,

this low inductance feature is

only realizable with the

cathode

connected

to

ground.

Ground

Gap