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RoHs Compliant

Beam Lead Constant Gamma

GaAs Tuning Varactor

V3

MA46580 & MA46585

1

Features

• Constant Gamma = 1.0 & 1.25 available

• High Q (3000 minimum at 4V 50MHz)

• Strong Beam Construction

(Minimum 10 gram beam strength)

• Low Parasitic Capacitance

• Close Capacitance tracking

• Lead-Free (RoHs Compliant) equivalents avail-

able with 260°C reflow compatibility.

Description

The MA46580,MA46585 and MA46H130 series of

beam lead constant gamma tuning varactors are

hyperabrupt junction gallium arsenide diodes with a

constant gamma of 1.0 or 1.25. The high Q values

and the elimination of package parasitics make

these varactors very attractive for voltage controlled

oscillators that require linear tuning. These tuning

diodes are useful at frequencies as high as 40 Ghz.

The beam lead design eliminates almost all of the

package parasitics resulting in improved linearity of

the junction capacitance change with applied re-

verse bias voltage. This improves tracking between

diodes and can improve VCO linearity.

1. Operation of this device above any one of these parameters

may cause permanent damage.

(Unless Otherwise Noted)

1

Parameter

Absolute Maximum

Reverse Voltage

18V

Operating Temperature

-65°C to +150°C

Storage Temperature

-65°C to +200°C

Power Dissipation

25mW at 25 °C

Beam Strength

10 grams minimum

Gamma = 1.25

2

Gamma4 = 1.13-1.38, VR = 2 - 12 Volts

Part Number

Case

Style

Total

Capaci-

tance

1

+/-20%

Total

Capaci-

tance

Ratio

Q

Minimum

Vr=4V

Vr=2V

Vr=12V

Vr=4V

f=50MHz

(pF)

-

-

MA46580-1209

1209

0.5

4.5-6.5

3000

Gamma = 1.0

2

Gamma4 = 0.9 - 1.1, VR = 2 - 12 Volts

Part Number

Case

Style

Total

Capaci-

tance

1

+/-20%

Total

Capaci-

tance

Ratio

Q

Minimum

Vr=4V

Vr=2V

Vr=12V

Vr=4V

f=50MHz

(pF)

-

-

MA46585-1209

1209

0.5

3.2-5.2

3000

Notes:

1. Capacitance is measured at 1 MHz.

2. All junctions are hyperabrupt with nominal

Γ= 1.0 or 1.25

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

Applications

These beam lead constant gamma tuning varactors

are particularly useful in broadband VCO’s, where

linear frequency tuning is an important feature.

They are also very useful for FM modulating a

source for telecommunication transmitter and in

many cases such circuits can be designed without

a linearization circuit.