MA46580 & MA46585
Beam Lead Constant Gamma GaAs Tuning Varactor
Rev. V4
Features
Absolute Maximum Ratings @ TA=+25 °C
(Unless Otherwise Noted)
1
• 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
Parameter
Absolute Maximum
18V
Reverse Voltage
Operating Temperature
-65°C to +150°C
• Close Capacitance tracking
• Lead-Free (RoHs Compliant) equivalents
available with 260°C reflow compatibility
Storage Temperature
Power Dissipation
Beam Strength
-65°C to +200°C
25mW at 25 °C
10 grams minimum
Description
1. Operation of this device above any one of these parameters
may cause permanent damage.
The MA46580 & MA46585 series beam lead con-
stant gamma tuning varactors are hyper-abrupt junc-
tion 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 re-
quire linear tuning. These tuning diodes are useful at
frequencies as high as 40 Ghz.
Applications
These beam lead constant gamma tuning varac-
tors are particularly useful in broadband VCO’s,
where linear frequency tuning is an important
feature. They are also very useful for FM modu-
lating a source for telecommunication transmitter
and in many cases such circuits can be designed
without a linearization circuit.
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.
Electrical Specifications @ TA = +25 °C
Electrical Specifications @ TA = +25 °C
Gamma = 1.02
Gamma = 1.252
Gamma4 = 0.9 - 1.1, VR = 2 - 12 Volts
Gamma4 = 1.13-1.38, VR = 2 - 12 Volts
Breakdown Voltage @ IR = 10µA, Vb = 18 V Min
Reverse Leakage Current @ VR =14V, IR = 50 nA Max
Breakdown Voltage @ IR = 10µA, Vb = 18 V Min
Reverse Leakage Current @ VR =14V, IR = 50 nA Max
Total
Capaci-
tance1
+/-20%
Total
Capaci-
tance
Total
Total
Capaci-
tance
Q
Mini-
mum
Q
Mini-
mum
Case
Style
Case Capaci-
Style
tance1
+/-20%
Ratio
Ratio
Part Number
Part Number
Vr=2V
Vr=12V f=50MHz
Vr=4V
Vr=2V
Vr=12V f=50MHz
Vr=4V
Vr=4V
Vr=4V
(pF)
0.5
-
-
(pF)
0.5
-
-
MA46580-1209 1209
4.5-6.5
3000
MA46585-1209 1209
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.
1
ADVANCED: Data Sheets contain information regarding a product M/A-COM Technology Solutions
is considering for development. Performance is based on target specifications, simulated results,
and/or prototype measurements. Commitment to develop is not guaranteed.
PRELIMINARY: Data Sheets contain information regarding a product M/A-COM Technology
Solutions has under development. Performance is based on engineering tests. Specifications are
typical. Mechanical outline has been fixed. Engineering samples and/or test data may be available.
Commitment to produce in volume is not guaranteed.
• North America Tel: 800.366.2266 / Fax: 978.366.2266
• Europe Tel: 44.1908.574.200 / Fax: 44.1908.574.300
• Asia/Pacific Tel: 81.44.844.8296 / Fax: 81.44.844.8298
Visit www.macomtech.com for additional data sheets and product information.
M/A-COM Technology Solutions Inc. and its affiliates reserve the right to make
changes to the product(s) or information contained herein without notice.
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