Low Resistance Plastic Packaged PIN Diodes
SMP1322 Series
SMP1322-016 SOT-143 T/R Switch
SMP1322-017 SOT-143 Low Inductance
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.
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.
SMP1322-016 in λ/4 T/R Switch
Transmitter
GND
4
3
Bias
4
3
3
2
4
2
1
4
3
1
2
1
1
2
Receiver
Antenna
λ/4
Schematic
Switch
Connection
Lead
Configuration
λ/4 T/R Switch
Bias
T/R Switch Design
Antenna
DC Control
Antenna
λ/4
Receiver
λ /4
Transmitter
Transmitter
Receiver
SMP1322-011
SMP1322-017
25
20
15
10
5
IF = 10 mA
Zero Bias
0
0.5
1
2
3
4
Frequency (GHz)
SMP1322-017 Typical SPST
Switch Performance
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
ALPHA [ ALPHA INDUSTRIES ]
