MA46477-134

Overview

The MA46477-134 is a Gallium Arsenide (GaAs) hyperabrupt junction varactor diode from the MA464xx series, designed for VHF through Ka band applications. It features a constant gamma value of 1.25, enabling more linear voltage-controlled oscillator frequency tuning compared to conventional hyperabrupt varactors. The device offers high quality factors, up to 4000 at -4 Volts, and nearly constant modulation sensitivity. Key electrical specifications include a total capacitance of 2.2 pF ±10% at VR = 4 V (f = 1 MHz), a capacitance ratio of 8.7 (VR = 2 V / 20 V), and a minimum Q of 3000 at VR = 4 V (f = 50 MHz). It exhibits a breakdown voltage of 22 V min and reverse leakage current of 100 nA max.

Feature Summary

• Constant gamma value of 1.25 for improved linearity in VCO frequency tuning
• High quality factor (Q) supporting excellent tuning performance across VHF to Ka bands
• Hyperabrupt junction characteristic providing large capacitance change versus bias voltage
• Lead-free construction with RoHS compliance and 260°C reflow compatibility

Applications

• Voltage tuned filters
• Analog phase shifters
• Modulator circuits
• VHF through Ka band tuning applications

Procurement Notes

Verify the specific package style required, as the datasheet indicates multiple case styles are available for this series. Confirm that the ordering suffix corresponds to the desired physical form factor, such as chip or ceramic package. Ensure environmental requirements align with the specified temperature ranges and MIL-STD-750 ratings if applicable for the target deployment.

Selection Notes

Select this component when a constant gamma of 1.25 is required for linear tuning characteristics. Compare the 2.2 pF nominal capacitance against circuit requirements at 4 V bias. Evaluate the Q factor of 3000 at 50 MHz against system loss constraints. Consider the 22 V breakdown voltage for maximum operating swing limits in the design.

Part Context

This part belongs to the MACOM MA464xx series of GaAs hyperabrupt varactor diodes. The series is categorized by constant gamma values of 1.0, 1.25, and 1.5. The MA4647x sub-series specifically targets the 1.25 gamma application, offering distinct capacitance ratios and breakdown voltages compared to the gamma 1.0 and 1.5 variants within the same family.

Replacement Considerations

Direct substitutes within the same gamma class include other MA4647x parts like MA46470, MA46471, MA46472, MA46473, MA46474, MA46479, MA46480, MA46481, MA46483, MA46485, which share the 1.25 gamma characteristic but differ in capacitance values.