Low Distortion Attenuator Plastic Packaged PIN Diodes

SMP1304 Series

Alpha Industries, Inc. [781] 935-5150

• Fax [617] 824-4579 • Email sales@alphaind.com • www.alphaind.com

3

Specifications subject to change without notice. 1/01A

4

31

2

43

12

SMP1304-019 (PI)

SMP1304-007

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.

SMP1304-019 PI Attenuator PIN Diodes

The SMP1304-019 employ three PIN diode junctions in

a SOT-143 package. They are configured for ease of

insertion in PI attenuator circuits commonly used from 10

MHz to beyond 1 GHz. The SMP1304 PIN diode junction

was designed for low capacitance, wide resistance

dynamic range and low distortion performance.

RR

R

R

R

-55°C

-15°C

+25°C

+65°C

+100°C

(mA)

(

Ω

Ω)(Ω

Ω)(Ω

Ω)(Ω

Ω)(Ω

Ω)

0.02

1590.0

1660.0

1752.0

1770.0

1760.0

0.10

315.0

340.0

367.0

396.0

409.0

0.30

108.0

118.0

128.0

141.0

147.0

1.00

34.5

37.9

41.6

46.3

48.8

10.00

4.8

5.3

5.8

6.6

7.0

20.00

3.0

3.3

3.6

4.1

4.3

100.00

1.3

1.4

1.5

1.7

1.8

Resistance vs. Temperature @ 100 MHz

Ground

Gap