GaAs Constant Gamma
Hyperabrupt Tuning Varactors
Features
q
q
q
q
q
MA46410 thru 480 Series
V3.00
Case Styles
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 tun-
ing 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 toler-
ances 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.
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 frequen-
cy tuning than do conventional hyperabrupt tuning varac-
tors. These varactors are particularly well suited for use in
voltage tuned filters, analog phase shifters, and modulator
circuits.
PACKAGED TUNING VARACTOR EQUIVALENT CIRCUIT
TUNING VOLTAGE V
R
+ Ø (VOLTS)
Specifications Subject to Change Without Notice.
M/A-COM, Inc.
North America:
Tel. (800) 366-2266
Fax (800) 618-8883
s
1
Asia/Pacific: Tel. +81 (03) 3226-1671
Fax +81 (03) 3226-1451
s
Europe: Tel. +44 (1344) 869 595
Fax +44 (1344) 300 020
GaAs Constant Gamma Hyperabrupt Tuning Varactors
Electrical Specifications at 25°C
MA46450 Series
Gamma = 1.0
MA46470 Series
MA46410 thru 480 Series
V3.00
Gamma = 1.25
Reverse Voltage
6
= 22 Volts minimum
Gamma
4
= 0.9 - 1.1, V
R
= 2 - 20 Volts
Junction Capacitance Ratio (C
J2
/C
J20
) = 5.0 - 8.0
Total
2, 3, 5, 7
Capacitance
Cases
1
@ -4 Volts
Style Min./Max. (pF)
30
30
30
30
30
30
30
30
0.5
0.7
1.0
1.5
1.8
2.2
3.3
4.7
Total
Capacitance
7
Ratio (2/20)
Min./Max.
2.0-3.8
2.9-4.4
3.6-5.2
3.8-5.5
4.1-6.1
4.1-6.1
4.5-6.7
4.8-7.2
50 MHz
Q at
-4 VoIts
Typical
4000
4000
3000
3000
3000
3000
2000
1500
Reverse Voltage
6
= 22 Volts minimum
Gamma
4
= 1.13 - 1.38, V
R
= 2 - 20 Volts
Junction Capacitance Ratio (C
J2
/C
J20
) = 8.15 - 12.99
Total
2, 3, 5, 7
Capacitance
@ -4 Volts
Min./Max. (pF)
0.5
0.7
1.0
1.2
1.5
1.8
2.0
2.2
2.7
3.3
3.7
4.7
5.6
6.8
8.2
10.0
Total
50 MHz
Capacitance
7
Q at
Ratio (2/20)
-4 Volts
Min./Max.
Minimum
2.2/4.1
3.6/5.6
4.8/7.4
4.8/7.4
5.0/7.4
6.6/8.7
6.6/8.7
6.6/8.7
6.4/10.0
6.4/10.0
6.8/11.0
6.9/11.1
7.2/11.5
7.2/11.5
7.2/11.5
7.5/12.0
4000
4000
3000
3000
3000
3000
3000
3000
2000
2000
2000
1500
1500
1500
1500
1500
Model
Number
MA46450
MA46451
MA46452
MA46454
MA46455
MA46457
MA46459
MA46461
Model
Number
MA46470
MA46471
MA46472
MA46473
MA46474
MA46475
MA46476
MA46477
MA46478
Case
1
Style
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
MA46410 Series
Gamma = 1.5
MA46479
MA46480
MA46481
MA46482
50 MHz
Q at
-4 Volts
Typical
3000
2500
2500
1800
1800
1200
1200
1200
Breakdown Voltage
6
= 18 Volts minimum
Gamma
4
= 1.4 - 1.6, V
R
= 2 - 12 Volts
Junction Capacitance Ratio (C
J2
/C
J12
) = 6.2 - 10.8
4
Total
2, 6, 7
Capacitance
@ -4 Volts
Min./Max. (pF)
0.45-0.60
0.90-1.10
1.62-1.98
2.42-2.97
3.33-4.22
4.22-5.17
5.04-6.16
9.00-11.00
Total
Capacitance
7
Ratio (2/12)
Min./Max.
2.7-4.3
4.2-5.7
5.2-4.9
5.7-7.6
6.0-8.1
6.2-8.3
6.3-8.4
6.6-8.8
MA46483
MA46484
MA46485
Model
Number
MA46410
MA46413
MA46416
MA46418
MA46420
MA46421
MA46422
MA46425
Case
1
Style
30
30
30
30
30
30
30
30
Absolute Maximum Ratings at +25°C
Parameter
Operating Temperature*
Storage Temperature
Reverse Voltage
1088 case style is 125°C.
Absolute Maximum
-65°C to +175°C
-65°C to +200°C
Breakdown Voltage
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 (C
p
and L
s
) are given for most case styles along with
case outlines in the appendix. The Cp values listed typically have toler-
ances of ±0.02 pF.
3. The nominal tolerance at -4 Volts is ± 10%. Closer tolerances are avail-
able upon request. By adding the suffix A to the part number, a toler-
ance 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 (V
B
) 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 val-
ues.
Environmental Ratings PER MIL-STD-750
MIL Method
Storage Temperature
1031
Temperature Cycle
1051
Shock
2016
Vibration
2056
Constant Acceleration 2006
Humidity
1021
Level
See maximum ratings
10 cycles, -65°C to +175°C
500 g’s
15 g’s
20,000 g’s
10 days
*
The maximum storage and operating temperature of the plastic
Specifications Subject to Change Without Notice.
2
North America:
Tel. (800) 366-2266
Fax (800) 618-8883
s
M/A-COM, Inc.
Asia/Pacific: Tel. +81 (03) 3226-1671
Fax +81 (03) 3226-1451
s
Europe: Tel. +44 (1344) 869 595
Fax +44 (1344) 300 020
GaAs Constant Gamma Hyperabrupt Tuning Varactors
Case Styles
(See appendix for complete dimensions)
MA46410 thru 480 Series
V3.00
Specifications Subject to Change Without Notice.
M/A-COM, Inc.
North America:
Tel. (800) 366-2266
Fax (800) 618-8883
s
3
Asia/Pacific: Tel. +81 (03) 3226-1671
Fax +81 (03) 3226-1451
s
Europe: Tel. +44 (1344) 869 595
Fax +44 (1344) 300 020
GaAs Constant Gamma Hyperabrupt Tuning Varactors
Typical Performance Curves
TOTAL CAPACITANCE vs REVERSE BIAS VOLTAGE (γ = 1.0)
(PARTS IN CASE STYLE 30)
MA46410 thru 480 Series
V3.00
JUNCTION CAPACITANCE vs REVERSE BIAS VOLTAGE (γ = 1.0)
(CHIPS)
.1
V
R
(VOLTS)
100
.1
V
R
(VOLTS)
100
TOTAL CAPACITANCE vs REVERSE BIAS VOLTAGE (γ = 1.25)
(PARTS IN CASE STYLE 30)
JUNCTION CAPACITANCE vs REVERSE BIAS VOLTAGE (γ = 1.25)
(CHIPS)
.1
V
R
(VOLTS)
100
.1
V
R
(VOLTS)
100
Specifications Subject to Change Without Notice.
4
North America:
Tel. (800) 366-2266
Fax (800) 618-8883
s
M/A-COM, Inc.
Asia/Pacific: Tel. +81 (03) 3226-1671
Fax +81 (03) 3226-1451
s
Europe: Tel. +44 (1344) 869 595
Fax +44 (1344) 300 020
GaAs Constant Gamma Hyperabrupt Tuning Varactors
MA46410 thru 480 Series
V3.00
Typical Performance Curves (Cont’d)
TOTAL CAPACITANCE vs REVERSE BIAS VOLTAGE (γ = 1.5)
(PARTS IN CASE STYLE 30)
JUNCTION CAPACITANCE vs REVERSE BIAS VOLTAGE (γ = 1.5)
(CHIPS)
.1
1
V
R
(VOLTS)
10
100
.1
1
V
R
(VOLTS)
10
100
GAMMA vs VOLTAGE
V
R
(VOLTS)
Specifications Subject to Change Without Notice.
M/A-COM, Inc.
North America:
Tel. (800) 366-2266
Fax (800) 618-8883
s
5
Asia/Pacific: Tel. +81 (03) 3226-1671
Fax +81 (03) 3226-1451
s
Europe: Tel. +44 (1344) 869 595
Fax +44 (1344) 300 020
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