M/A-COM, Inc.
North America:
Tel. (800) 366-2266
s
Asia/Pacific: Tel. +81 (03) 3226-1671
s
Europe: Tel.
+44 (1344) 869 595
Fax (800) 618-8883
Fax +81 (03) 3226-1451
Fax +44 (1344) 300 020
1
Specifications Subject to Change Without Notice.
V3.00
GaAs Constant Gamma
Hyperabrupt Tuning Varactors
MA46410 thru 480 Series
Features
q
Constant Gamma = 1.0, 1.25 or 1.5
q
High Q (up to 4000 at -4 Volts)
q
Larger Capacitance Change with Voltage
q
More Linear Frequency Tuning
q
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.
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.
Case Styles
30
277
PACKAGED TUNING VARACTOR EQUIVALENT CIRCUIT
TYPICAL JUNCTION CAPACITANCE vs TUNING VOLTAGE
TUNING VOLTAGE V
R
+ (VOLTS)
M/A-COM, Inc.
North America:
Tel. (800) 366-2266
s
Asia/Pacific: Tel. +81 (03) 3226-1671
s
Europe: Tel.
+44 (1344) 869 595
Fax (800) 618-8883
Fax +81 (03) 3226-1451
Fax +44 (1344) 300 020
2
Specifications Subject to Change Without Notice.
V3.00
*
The maximum storage and operating temperature of the plastic
1088 case style is 125C.
Absolute Maximum Ratings at +25C
GaAs Constant Gamma Hyperabrupt Tuning Varactors
MA46410 thru 480 Series
Electrical Specifications at 25C
MA46450 Series
Gamma = 1.0
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
MA46470 Series
Gamma = 1.25
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
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.
Total
2, 3, 5, 7
Total
50 MHz
Capacitance
Capacitance
7
Q at
Model
Cases
1
@ -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
Total
2, 6, 7
Total
50 MHz
Capacitance
Capacitance
7
Q 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
Total
2, 3, 5, 7
Total
50 MHz
Capacitance
Capacitance
7
Q at
Model
Case
1
@ -4 Volts
Ratio (2/20)
-4 Volts
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
Parameter
Absolute Maximum
Operating Temperature*
-65C to +175C
Storage Temperature
-65C to +200C
Reverse Voltage
Breakdown Voltage
Environmental Ratings PER MIL-STD-750
MIL Method
Level
Storage Temperature
1031
See maximum ratings
Temperature Cycle
1051
10 cycles, -65C to +175C
Shock
2016
500 g's
Vibration
2056
15 g's
Constant Acceleration
2006
20,000 g's
Humidity
1021
10 days
MA46410 Series
Gamma = 1.5
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
M/A-COM, Inc.
North America:
Tel. (800) 366-2266
s
Asia/Pacific: Tel. +81 (03) 3226-1671
s
Europe: Tel.
+44 (1344) 869 595
Fax (800) 618-8883
Fax +81 (03) 3226-1451
Fax +44 (1344) 300 020
3
Specifications Subject to Change Without Notice.
V3.00
GaAs Constant Gamma Hyperabrupt Tuning Varactors
MA46410 thru 480 Series
Case Styles
(See appendix for complete dimensions)
M/A-COM, Inc.
North America:
Tel. (800) 366-2266
s
Asia/Pacific: Tel. +81 (03) 3226-1671
s
Europe: Tel.
+44 (1344) 869 595
Fax (800) 618-8883
Fax +81 (03) 3226-1451
Fax +44 (1344) 300 020
4
Specifications Subject to Change Without Notice.
V3.00
GaAs Constant Gamma Hyperabrupt Tuning Varactors
MA46410 thru 480 Series
Typical Performance Curves
TOTAL CAPACITANCE vs REVERSE BIAS VOLTAGE (
= 1.0)
(PARTS IN CASE STYLE 30)
JUNCTION CAPACITANCE vs REVERSE BIAS VOLTAGE (
= 1.0)
(CHIPS)
TOTAL CAPACITANCE vs REVERSE BIAS VOLTAGE (
= 1.25)
(PARTS IN CASE STYLE 30)
JUNCTION CAPACITANCE vs REVERSE BIAS VOLTAGE (
= 1.25)
(CHIPS)
.1
100
V
R
(VOLTS)
.1
100
V
R
(VOLTS)
.1
100
V
R
(VOLTS)
.1
100
V
R
(VOLTS)
M/A-COM, Inc.
North America:
Tel. (800) 366-2266
s
Asia/Pacific: Tel. +81 (03) 3226-1671
s
Europe: Tel.
+44 (1344) 869 595
Fax (800) 618-8883
Fax +81 (03) 3226-1451
Fax +44 (1344) 300 020
5
Specifications Subject to Change Without Notice.
V3.00
GaAs Constant Gamma Hyperabrupt Tuning Varactors
MA46410 thru 480 Series
JUNCTION CAPACITANCE vs REVERSE BIAS VOLTAGE (
= 1.5)
(CHIPS)
Typical Performance Curves (Cont'd)
TOTAL CAPACITANCE vs REVERSE BIAS VOLTAGE (
= 1.5)
(PARTS IN CASE STYLE 30)
GAMMA vs VOLTAGE
.1
1
10
100
V
R
(VOLTS)
V
R
(VOLTS)
.1
1
10
100
V
R
(VOLTS)
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