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Product Detailed Parameters
- Description：DIODE,VARACTOR,GAAS CHIP
- Series：-
- Mfr：MACOM Technology Solutions
- Package：Tray
- Capacitance @ Vr, F：1.5pF @ 4V, 1MHz
- Capacitance Ratio：7.4
- Capacitance Ratio Condition：C2/C20
- Voltage - Peak Reverse (Max)：22 V
- Diode Type：Single
- Q @ Vr, F：3000 @ 4V, 50MHz
- Operating Temperature：-65°C ~ 175°C
- Grade：-
- Qualification：-
- Mounting Type：Surface Mount
- Package / Case：Die
- Supplier Device Package：Chip
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Overview
The MA46474-134 is a Gallium Arsenide hyperabrupt junction varactor diode from the MA464xx series, designed for VHF through Ka band applications. It features a constant gamma value of 1.25 to enable more linear voltage-controlled oscillator frequency tuning compared to conventional hyperabrupt varactors. The device provides high Q factors and nearly constant modulation sensitivity. Electrical specifications at +25°C include a total capacitance of 1.5 pF ±10% at VR = 4 V (f = 1 MHz), a minimum total capacitance ratio of 5.0 at VR = 2 V / 20 V, and a minimum Q of 3000 at VR = 4 V (f = 50 MHz).
Feature Summary
- Constant Gamma = 1.25 characteristic for improved linearity in VCO frequency tuning.
- High Q factor up to 3000 at 50 MHz for excellent tuning performance.
- Hyperabrupt junction providing large change in capacitance versus bias voltage.
- Lead-free RoHS compliant equivalent available with 260°C reflow compatibility.
Applications
- Voltage tuned filters
- Analog phase shifters
- Modulator circuits
Procurement Notes
Verify the specific package style required, as the datasheet indicates multiple ceramic packages are available for this series. Confirm that the standard ±10% capacitance tolerance meets design requirements, or request tighter tolerances directly from the manufacturer if necessary. Ensure the operating environment remains within the specified temperature range to maintain electrical stability.
Selection Notes
Select the MA46474-134 when a constant gamma of 1.25 is required for linear tuning characteristics across VHF to Ka bands. Compare its 1.5 pF capacitance and 3000 Q factor against other series members like the MA46473 or MA46477 to ensure optimal impedance matching and bandwidth for the specific circuit topology.
Part Context
This component belongs to the MACOM MA464xx Series of GaAs Hyperabrupt Varactor Diodes. The series encompasses three distinct constant gamma values: 1.0 (MA4645x/6x), 1.25 (MA4647x/8x), and 1.5 (MA4641x/2x). All parts share similar construction but differ in capacitance ratios and breakdown voltages to suit various tuning ranges.
Replacement Considerations
Direct substitutes within the same family include the MA46473 and MA46477, which share the same gamma value of 1.25 but offer different total capacitance values (1.2 pF and 2.2 pF respectively). Verify that the alternative part's capacitance ratio and Q factor align with the original circuit design constraints.
FAQ
What is the guaranteed constant gamma value for the MA46474?
The MA46474 belongs to the MA4647x series, which guarantees a constant gamma value of 1.25.
How does the package parasitic capacitance affect the total capacitance curve?
The total capacitance versus bias voltage curve deviates slightly from the chip capacitance curve due to package parasitic capacitance (Cp).
Is the MA46474 available in a lead-free version?
Yes, lead-free equivalents compliant with RoHS standards and compatible with 260°C reflow processes are available for this series.
