Low Resistance Plastic Packaged PIN Diodes

SMP1322 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

25

20

15

10

5

0

0.5

1

2

34

Frequency (GHz)

SMP1322-017 Typical SPST

Switch Performance

Zero Bias

Antenna

Receiver

Transmitter

Bias

λ/4

Antenna

Receiver

GND

Transmitter

Bias

λ/4

43

12

λ/4 T/R Switch

SMP1322-016 in

λ/4 T/R Switch

SMP1322-016 SOT-143 T/R Switch

The SMP1322-016 is a low cost PIN diode unconnected

pair specifically designed for low current drain antenna

T/R switches in hand held wireless suits. In the

specifically configured SOT-143 package, the PIN diodes

are oriented to enable connection as a

λ/4 switch with no

external crossover connections.

Transmitter

SMP1322-011

Antenna

DC Control

Receiver

SMP1322-017

λ/4

T/R Switch Design

SMP1322-017 SOT-143 Low Inductance

PIN Diode

The SMP1322-017 utilizes the SMP1322 PIN diode chip

in a customized SOT-143 plastic package designed for

high isolation performance in a shunt connected switch.

Its effective inductance, based on the 3 GHz isolation, is

less than 0.2 nH. This diode is designed to work effectively

as a shunt element in SPDT switches, covering the

wireless frequencies from 900 MHz to beyond 2 GHz.

Excellent performance is achievable when used in a

quarter-wave T/R switch with the SMP1322-001 (SOT-23)

or SMP1322-011 (SOD-323) PIN diode as the series

connected diode.

4

13

2

4

3

1

2

43

12

Schematic

Switch

Connection

Lead

Configuration