SMV1251 Series
Hyberabrupt Junction Tuning Varactor

The SMV1247-SMV1255 group of silicon hyperabrupt junction varactor diodes is designed for use in Voltage Controlled Oscillators (VCOs) with a low tuning voltage operation. This group of varactors is characterized for capacitance and resistance over temperature.

Please note: SMV1251-011LF is being discontinued and is not recommended for new designs.


  • High capacitance ratio: C0.3V/C4.7V = 12 typical
  • Packages rated MSL1, 260 °C per JEDEC J-STD-020
Data Sheets SMV1247-SMV1255 Series: Hyperabrupt Junction Tuning Varactors SMV1247_SMV1255_Series_200061U.pdf (845 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 : SMV1251 Series
Package Type : SC-70, SC-79, SOD-323, SOT-23
Vr Reverse Breakdown Voltage Ir = 10 µA (V) Min. : 15
Ct Total Capacitance3 Vr=1 V (pF) Typ. : 28.09
Ct Total Capacitance3 Vr=4 V (pF) Typ. : 3.95
Ct Total Capacitance3 Vr=8 V (pF) Typ. : 2.79
Ct Total Capacitance3 Vr=12 V (pF) Typ. :
Ct Total Capacitance3 Vr=20 V (pF) Typ. :
Total Capacitance Ratio Min.1 : 11
Capacitance Ratio Range (V) : 0.3 to 4.7
Rs Series Resistance Max2 (Ω) : 1.6
Product Information:
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