50 W Surface Mount Shunt Connected PIN Diode

The SMP1331-085LF 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 100 mA is 0.5  and typical capacitance at 30 V is 0.35 pF. The combination of low junction capacitance, low parasitic inductance, low thermal resistance, and nominal 30 m I-region width, makes the SMP1331-085LF useful in large signal switches and attenuator applications.

The device has a 2.5 W dissipation power rating, making it capable of handling more than 50 W @ 85 °C Continuous Wave (CW) in a shunt-connected transmit/receive (T/R) switch.

Design information for high power switches may be found in the Skyworks Application Note, Design With PIN Diodes (document number 200312).

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Min. VB IR = 10 µA (V)200
CT VR = 30 V (pF)0.35
VF IF = 10 mA (V)0.8
RS IF = 1 mA F = 100 MHz (Ω)9
RS IF = 10 mA F = 100 MHz (Ω)1.7
RS IF = 100 mA F = 100 MHz (Ω)0.5
Typical Carrier Lifetime IF = 10 mA (ns)600


  • Low-thermal resistance: 28 °C/W
  • Suitable for 50 W Continuous Wave T/R switches
  • Low capacitance: 0.35 pF
  • Low distortion performance
  • QFN (3-pin, 2 × 2 mm) package (MSL1, 260 °C per JEDEC J-STD-020)

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