ALPHA SMP1321-001, SMP1321-003, SMP1321-004, SMP1321-005, SMP1321-007 Datasheet

Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email [e-mail] • www.alphaind.com 1

Specifications subject to change without notice. 1/01A

Low Capacitance
Plastic Packaged PIN Diodes

Features

■ Designed for High Performance Wireless
Switch Applications

■ 0.25 pF Capacitance Specified

■ Multiple Package Configurations

■ Available in Tape and Reel Packaging

Description

The SMP1321 series of plastic packaged, surface
mountable PIN diodes are designed for high v olume switch
applications from 10 MHz to beyond 2 GHz. The low
capacitance of these diodes (0.25 pF) combined with its low
resistance (2.0 Ωmaximum at 10 mA) make the SMP1321
series particularly suited to high isolation series connected
PIN diode switches in battery operated circuits.Available
in a selection of plastic packages and in a variety of
configurations including a low inductance (0.4 nH) SOT-23
(SMP1321-007), the small footprint SC-79 and the
miniature SC-70.

SMP1321 Series

Parameter Condition Typ. Max. Unit

Reverse Current (IR)V

R

= 100 V 10 µA
Capacitance (CT) F = 1 MHz, V = 30 V 0.25 pF
Resistance (RS) F = 100 MHz, I = 1 mA 3.0 Ω
Resistance (RS) F = 100 MHz, I = 10 mA 2.0 Ω
Forward Voltage (VF) IF = 10 mA 0.85 V
Carrier Lifetime (TI) IF = 10 mA 0.4 µS
I Region Width 15 µm

Electrical Specifications at 25°C

Characteristic Value

Reverse Voltage (VR) 100 V
Power Dissipation @ 25°C Lead 250 mW

Temperature (PD)
Storage Temperature (TST) -65°C to +150°C
Operating Temperature (TOP) -65°C to +150°C
ESD Human Body Model Class 1B

Absolute Maximum Ratings

Single Common Common Series Pair Low Single Single

Anode Cathode Inductance

Marking: PM1 Marking: PM9 Marking: PM3 Marking: PM2 Marking: PMB

SOT-23 SOT-23 SOT-23 SOT-23 SOT-23 SOD-323 SC-79

♦ SMP1321-001 ♦ SMP1321-003 ♦ SMP1321-004 ♦ SMP1321-005 ♦ SMP1321-007 ♦ SMP1321-011 ♦ SMP1321-079

LS= 1.5 nH LS= 1.5 nH LS= 1.5 nH LS= 1.5 nH LS= 0.4 nH LS= 1.5 nH LS= 0.7 nH

SC-70 SC-70 SC-70

♦ SMP1321-073 ♦ SMP1321-074 ♦ SMP1321-075

LS= 1.4 nH LS= 1.4 nH LS= 1.4 nH

♦ Available through distribution.

2 Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email [e-mail] • www.alphaind.com

Specifications subject to change without notice. 1/01A

Low Capacitance Plastic Packaged PIN Diodes SMP1321 Series

Series Resistance vs. Current @ 100 MHz

0.01 0.1 1 10 100

Forward Current (mA)

Series Resistance (Ω)

0.1

1

10

100

0 1 2 5 10 20 50

Capacitance vs. Reverse Voltage

0

0.2

0.1

0.4

0.6

0.5

0.3

0.8

0.7

Reverse Voltage (V)

Capacitance (pF)

1 MHz–1 GHz

400 500 600 700 800 900 1000

DC Characteristic

0.01

0.1

1

10

100

Forward Voltage (mV)

Forward Current (mA)

0 500 1000 1500 2000

Conductance vs. Frequency

and Reverse Voltage

Frequency (MHz)

Conductance (µS)

0 V

10 V
40 V

0

100

200

300

400

500

600

700

800

Typical Performance Data

RRRRR

I

F

-55°C -15°C +25°C +65°C +100°C

(mA) (ΩΩ)(

ΩΩ

)(

ΩΩ

)(

ΩΩ

)(

ΩΩ

)

0.02 47.400 50.000 56.300 61.500 65.100

0.10 12.000 12.600 13.900 15.400 16.400

0.30 5.200 5.400 5.800 6.400 6.900

0.50 3.600 3.800 4.100 4.500 4.800

1.00 2.400 2.500 2.600 2.800 3.100

10.00 1.030 1.040 1.040 1.070 1.150

20.00 0.871 0.888 0.873 0.889 0.956

100.00 0.669 0.659 0.642 0.645 0.695

Resistance vs. Temperature @ 500 MHz 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
figure. Because of the
polarity of the diode
junction, this low inductance
feature is only realizable with
the cathode connected to
ground.

Gap

Ground