MGV125-20

Overview

The MGV125-20 is a Gallium Arsenide (GaAs) hyperabrupt varactor diode from the MGV125-x Series, characterized by a constant gamma of 1.25. It features passivated mesa construction for low leakage and stability. The device supports a tuning voltage range of 0 to 22 V with typical tuning ratios up to 10. Electrical specifications at TA = +25°C include a nominal total capacitance of 0.50 pF (range: 0.45–0.55 pF) measured at VR = 4 V and 1 MHz. At VR = 4 V and 50 MHz, it achieves a minimum Q factor of 4,000. Available in chip (C01A) or packaged formats such as E28, 28X, H20, P55, and 0805-2.

Feature Summary

• Passivated mesa construction ensures low leakage current and excellent post-tuning drift performance.
• Hyperabrupt junction design provides a constant gamma of 1.25 for linear tuning characteristics.
• Screening options available per MIL-PRF-19500 and MIL-PRF-35834 standards.

Applications

• Tunable filters operating up to 40 GHz
• Voltage-controlled oscillators (VCOs)
• Microwave phase shifters

Procurement Notes

Verify the specific package style required for the application, as electrical parameters like parasitic capacitance and inductance vary between chip and packaged versions. Confirm if military screening per MIL-PRF-19500 or MIL-PRF-35834 is necessary, as this affects availability and lead times. Ensure the ordering suffix matches the desired form factor, such as E28, H20, or 0805-2.

Selection Notes

Select the MGV125-20 when a nominal capacitance near 0.50 pF is required at 4 V bias. This model offers high Q factors suitable for low-loss applications. Consider alternative suffixes if packaged components are preferred over bare die. Verify that the 0–22 V tuning range aligns with the system's voltage supply capabilities.

Part Context

The MGV125-20 belongs to the MGV125-x Series of GaAs hyperabrupt varactor diodes. This series includes variants with different capacitance values but shares the same 1.25 constant gamma characteristic. Other models in the family include MGV125-08 through MGV125-26, offering capacitances ranging from approximately 0.25 pF to 2.20 pF.

Replacement Considerations

MGV125-20-E28, MGV125-20-H20, MGV125-20-P55, MGV125-20-0805-2