M A COM MA46477, MA46476, MA46475, MA46474, MA46473 Datasheet

GaAs Constant Gamma
Hyperabrupt T uning V aractors

Features

●

Constant Gamma = 1.0, 1.25 or 1.5

●

High Q (up to 4000 at -4 Volts)

●

Larger Capacitance Change with Voltage

●

More Linear Frequency Tuning

●

High and Nearly Constant Modulation Sensitivity

Description

The MA46450, MA46470 and MA46410 series of tuning
varactors are hyperabrupt junction Gallium Arsenide
diodes featuring constant gamma 1.0 (MA46450 series),

1.25 (MA46470 series) or 1.5 (MA46410 series). These
diodes offer high Q (up to 4000) permitting excellent tun­ing performance from VHF through Ka band. Each part in
this series exhibits the large change in capacitance versus
bias voltage characteristic of hyperabrupt junctions. The
standard capacitance tolerance is ±10%, with tighter toler­ances available. Capacitance matching at one or more bias
voltages is also available. All diode types are available in
a wide selection of ceramic packages and in chip form.

Case Styles

MA46410 thru 480 Series

V3.00

30

277

TYPICAL JUNCTION CAPACITANCE vs TUNING VOLTAGE

Applications

The constant gamma value of 1.0, 1.25 or 1.5 available
with these diodes enables the circuit designer to produce
significant improvements in circuit performance. Constant
gamma tuning varactors permit more linear VCO frequen­cy tuning than do conventional hyperabrupt tuning varac­tors. These varactors are particularly well suited for use in
voltage tuned filters, analog phase shifters, and modulator
circuits.

PACKAGED TUNING VARACTOR EQUIVALENT CIRCUIT

TUNING VOLT A GE V

+ Ø (VOLTS)

R

M/A-COM, Inc.

Specifications Subject to Change Without Notice.

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1

GaAs Constant Gamma Hyperabrupt Tuning Varactors MA46410 thru 480 Series

V3.00

Electrical Specifications at 25°C

MA46450 Series Gamma = 1.0

Reverse Voltage6= 22 Volts minimum
Gamma4= 0.9 - 1.1, VR= 2 - 20 Volts
Junction Capacitance Ratio (CJ2/C

Total

J20

2, 3, 5, 7

) = 5.0 - 8.0

Total 50 MHz

Capacitance Capacitance7Q at
Model Cases1@ -4 Volts Ratio (2/20) -4 VoIts
Number Style Min./Max. (pF) Min./Max. Typical

MA46450 30 0.5 2.0-3.8 4000
MA46451 30 0.7 2.9-4.4 4000
MA46452 30 1.0 3.6-5.2 3000
MA46454 30 1.5 3.8-5.5 3000
MA46455 30 1.8 4.1-6.1 3000
MA46457 30 2.2 4.1-6.1 3000
MA46459 30 3.3 4.5-6.7 2000
MA46461 30 4.7 4.8-7.2 1500

MA46410 Series Gamma = 1.5

Breakdown V oltage6= 18 Volts minimum
Gamma4= 1.4 - 1.6, VR= 2 - 12 Volts
Junction Capacitance Ratio (CJ2/C

Total

J12

2, 6, 7

) = 6.2 - 10.8

Capacitance Capacitance7Q at
Model Case

1

@ -4 Volts Ratio (2/12) -4 Volts

Number Style Min./Max. (pF) Min./Max. Typical

MA46410 30 0.45-0.60 2.7-4.3 3000
MA46413 30 0.90-1.10 4.2-5.7 2500
MA46416 30 1.62-1.98 5.2-4.9 2500
MA46418 30 2.42-2.97 5.7-7.6 1800
MA46420 30 3.33-4.22 6.0-8.1 1800
MA46421 30 4.22-5.17 6.2-8.3 1200
MA46422 30 5.04-6.16 6.3-8.4 1200
MA46425 30 9.00-11.00 6.6-8.8 1200

4

Total 50 MHz

Absolute Maximum Ratings at +25°C

Parameter Absolute Maximum

Operating Temperature* -65°C to +175°C
Storage Temperature -65°C to +200°C
Reverse V oltage Breakdown V oltage

* The maximum storage and operating temperature of the plastic

1088 case style is 125°C.

2

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Specifications Subject to Change Without Notice.

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MA46470 Series Gamma = 1.25

Reverse Voltage6= 22 Volts minimum
Gamma4= 1.13 - 1.38, VR= 2 - 20 Volts
Junction Capacitance Ratio (CJ2/C

Total

Capacitance Capacitance

Model Case

1

@ -4 Volts Ratio (2/20) -4 Volts

J20

2, 3, 5, 7

) = 8.15 - 12.99

Total 50 MHz

7

Q at

Number Style Min./Max. (pF) Min./Max. Minimum

MA46470 30 0.5 2.2/4.1 4000
MA46471 30 0.7 3.6/5.6 4000
MA46472 30 1.0 4.8/7.4 3000
MA46473 30 1.2 4.8/7.4 3000
MA46474 30 1.5 5.0/7.4 3000
MA46475 30 1.8 6.6/8.7 3000
MA46476 30 2.0 6.6/8.7 3000
MA46477 30 2.2 6.6/8.7 3000
MA46478 30 2.7 6.4/10.0 2000
MA46479 30 3.3 6.4/10.0 2000
MA46480 30 3.7 6.8/11.0 2000
MA46481 30 4.7 6.9/11.1 1500
MA46482 30 5.6 7.2/11.5 1500
MA46483 30 6.8 7.2/11.5 1500
MA46484 30 8.2 7.2/11.5 1500
MA46485 30 10.0 7.5/12.0 1500

Notes:

1. All GaAs tuning varactors are available in chip form as well as the case
styles shown on the following page.When ordering, specify the desired
case by adding the case designation as a suffix to the type number.

2. Case parasitics (Cpand Ls) are given for most case styles along with
case outlines in the appendix.The Cp values listed typically have toler­ances of ±0.02 pF.

3. The nominal tolerance at -4 Volts is ± 10%. Closer tolerances are avail­able upon request. By adding the suffix A to the part number, a toler­ance of ± 5% at -4 Volts is guaranteed.

4. The values guaranteed for gamma are measured on unpackaged
chips.The total capacitance versus bias voltage curve will deviate
slightly from the chip capacitance versus bias voltage curve due to the
package parasitic capacitance (Cp).

5. Capacitance is measured at 1 MHz.

6. Reverse voltage (VB) is measured at 10 microamps.

7. The total capacitance and capacitance ratios shown are for diodes
housed in case style 30. Other case styles will result in different val­ues.

Environmental Ratings PER MIL-STD-750

MIL Method Level

Storage Temperature 1031 See maximum ratings
Temperature Cycle 1051 10 cycles, -65°C to +175°C
Shock 2016 500 g’s
Vibration 2056 15 g’s
Constant Acceleration 2006 20,000 g’s
Humidity 1021 10 days

M/A-COM, Inc.