Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

203498A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 12, 2015

1

DATA SHEET

SMP1321-085LF: Surface-Mount PIN Diode for Switch and

Attenuator Applications

Applications

 Low-loss, high-power switches

 Low-distortion attenuators

Features

 Low thermal resistance: 59 °C/W

 Suitable component for RF switches or attenuators

 Low capacitance: 0.27 pF typical @ 30 V

 Low distortion performance

 QFN (3-pin, 2 x 2 mm) package

(MSL1, 260

C per JEDEC J-STD-020)

all applicable legislation and are halogen-free.

For additional information, refer to Skyworks

SQ04–0074.

Anode

(Pin 3)

Anode

(Pin 1)

Cathode

(Pin 2, Exposed Paddle)

Figure 1. SMP1321-085LF Block Diagram

Description

The SMP1321-085LF is a surface-mountable, low-capacitance

silicon PIN diode designed as a shunt connected PIN diode for

high-power, high-volume switch and attenuator applications from

10 MHz to beyond 6 GHz.

Maximum resistance at 10 mA is 1.5

Ω, and maximum

capacitance at 30 V is 0.35 pF. The combination of low junction

capacitance, low parasitic inductance, low thermal resistance,

and nominal 15

μm I-region width, makes the SMP1321-085LF

useful in large signal switches and attenuator applications.

The device has a 1.4 W dissipation power rating, making it

capable of handling more than 35 W continuous wave (CW) and

350 W peak (1

shunt-connected transmit/receive (T/R) switch.

Design information for high-power switches can be found in the

Skyworks Application Note, Design With PIN Diodes (document

number 200312).

A block diagram of the SMP1321-085LF is shown in Figure 1.