SMV1231 Series
Hyperabrupt Junction Tuning Varactors

The SMV123x series of silicon hyperabrupt junction varactor diodes are designed for use in Voltage Controlled Oscillators (VCOs) with a low tuning voltage operation. The low resistance of these varactors makes them appropriate for high-Q resonators in wireless system VCOs to frequencies over 10 GHz. This family of varactors is characterized for capacitance and resistance over temperature.


  • High capacitance ratio
  • Low series resistance for low phase noise
  • Packages rated MSL1, 260 °C per JEDEC J-STD-020
Data Sheets SMV123x Series: Hyperabrupt Junction Tuning Varactors SMV123x_Series_200058Z.pdf (1023 KB)
Application Notes Solder Reflow Information Solder_Reflow_Info_200164C.pdf (109 KB)
Application Notes Varactor SPICE Models for RF VCO Applications Varactor_SPICE_Model_AN_200315C.pdf (240 KB)
ProductName : SMV1231 Series
Package Type : SC-70, SC-79, SOD-323, SOD-882
Vr Reverse Breakdown Voltage Ir = 10 µA (V) Min. : 15
Ct Total Capacitance3 Vr=1 V (pF) Typ. : 1.58
Ct Total Capacitance3 Vr=4 V (pF) Typ. : 0.794
Ct Total Capacitance3 Vr=8 V (pF) Typ. : 0.534
Ct Total Capacitance3 Vr=12 V (pF) Typ. : 0.487
Ct Total Capacitance3 Vr=20 V (pF) Typ. :
Total Capacitance Ratio Min.1 : 1.5
Capacitance Ratio Range (V) : 1 to 3
Rs Series Resistance Max2 (Ω) : 2.9
Product Information:
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