UHF, VHF Hyperabrupt
Tuning Varactors
Features
q
MA4ST520, MA4ST530 Series
V3.00
Case Style
(See appendix for complete dimensions)
q
q
A Superior Ion Implantation Process Results in More
Repeatable C-V Characteristics Within Specified
Capacitance Tolerances
High Q
Usable Capacitance Change Ratios as High as 8:1.
(MA4ST520 Series)
Description
M/A-COM’s silicon hyperabrupt tuning varactors combine
advantages of a repeatable ion-implant process with
excellent passivation and low series resistance. The result-
ing diodes exhibit a C-V characteristic that is consistent
from lot to lot and stable within close tolerances, over
time and temperature.
Applications
The MA4ST520 series was developed for VCO tuning in
the VHF through UHF ranges. Applications are high
volume fixed tuned and frequency hopping military radios
where low cost and lot-to-lot C-V repeatability are critical.
The MA4ST530 family has a faster change of capacitance
with voltage.
Absolute Maximum Ratings at 25°C
Parameter
Temperature Range
Operating
Storage
Absolute Maximum
-65°C to +125°C
-65°C to +150°C
(derate linearly to zero at 150°C)
250 mW (Case Style 4)
Same as V
B
50 mAdc
@ 80% V
B
= 100 nA max. @ +25°C
Ordering Information
When ordering diodes, use the appropriate M/A-COM
model number and add case style suffix where appropri-
ate. (For example, MA4ST520B is an 18-22 pF (@ 4V)
varactor in the standard glass package (case style 4). The
MA4ST520B-132 is the unpackaged chip version.
Power Dissipation (Max.)
Max. Reverse Voltage
Forward Current
Max. Leakage Current
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
UHF, VHF Hyperabrupt Tuning Varactors
High Tuning Ratio
Electrical Specifications at 25°C
Min. Reverse Voltage V
R
22 V @ 10 µA
Parameter
Test
Conditions
Part Number
MA4ST520
MA4ST520B
MA4ST520D
MA4ST522
MA4ST522C
MA4ST522D
MA4ST523
MA4ST523C
MA4ST523D
MA4ST524
MA4ST524C
MA4ST524D
MA4ST520, MA4ST530 Series
V3.00
Max. Reverse Leakage Current I
R
@ 18 V = 100 nAmps
Tuning Ratio
F = 1 MHz
V
R
= 20 Vdc
Min./Max.
—
3.1/3.9
3.1/3.9
—
—
7.3/9.2
—
—
16/20
—
—
22.5/28
C (4V)/C (8V) C (4V)/C (20V)
Min./Max.
—
—
2.0/2.7
—
2.2/2.8
2.2/2.8
—
2.15/2.8
2.15/2.8
—
2.1/2.8
2.1/2.8
Min./Max.
—
4.6/7.1
4.8/6.8
—
—
5.2/6.9
—
—
5.2/7.3
—
—
5.2/7.2
Figure of Merit
Diode Capacitance
1
(pF)
F = 1 MHz
V
R
= 2.5 Vdc
Min./Max.
25/29
—
—
62/72
—
—
135/160
—
—
195/225
—
147/163
V
R
= 4.0 Vdc
Min./Max.
18/22
18/22
19/21
45/55
47.5/52.5
47.5/52.5
100/120
104.5/115.5
104.5/115.5
140/170
147/163
147/163
V
R
= 8.0 Vdc
Min./Max.
—
7.5/10.5
7.8/9.2
—
18.4/21.6
18.4/21.6
—
41.4/48.6
41.4/48.6
—
59.8/70.2
59.8/70.2
F = 50 MHz
V
R
= 4 Vdc
Typ.
150
300
300
100
200
200
65
125
125
50
100
100
Chip Style
2
132
132
132
132
132
132
200
200
200
200
200
200
Note:
1. The capacitance values and tuning ratios are given for diodes in case
style 4. Chip diodes may have slightly different values.
Electrical Specifications at 25°C
Parameter
Reverse
Breakdown
Volage (Vdc)
Diode Capacitance
1
(pF)
Tuning Ratio
Figure of Merit
Test
Conditions
Part Number
MA4ST533
MA4ST533B
MA4ST533C
MA4ST534B
MA4ST534C
Notes:
F = 1 MHz
@ 10 µAdc
MIn.
15
22
22
22
22
V
R
= 1.25 Vdc
Min./Max.
14/17.5
—
F = 1 MHz
V
R
= 20 Vdc
Min./Max.
—
2.0/2.4
2.0/2.3
4.5/5.3
4.5/5.1
C (3V)/C (8V) C (3V)/C (20V)
Min./Max.
—
—
—
—
—
Min./Max.
—
4.4/6.3
4.6/6.3
4.7/6.9
4.9/6.9
F = 50 MHz
V
R
= 3 Vdc
Typ.
200
300
450
200
300
V
R
= 3.0 Vdc
Min./Max.
10.5/12.5
10.5/12.5
10.5/12.5
25/31
25/31
V
R
= 8.0 Vdc
Min./Max.
—
4.3/4.7
4.3/4.7
10/13.5
10/13.5
—
—
—
1. For all model numbers listed above the reverse leakage current at 80%
of related V
B
Max. is 100 nAmps Max.
2. All model numbers listed above are available in axial lead Case Style 4
and Chip Style 132. To order chip style 132, add the case style suffix to
the part number, ie: MA4ST533-132.
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
UHF, VHF Hyperabrupt Tuning Varactors
Typical Performance Curves MA4ST520 Series
REVERSE LEAKAGE CURRENT @ - 18V vs
JUNCTION TEMPERATURE
MA4ST520, MA4ST530 Series
V3.00
NOMINAL CAPACITANCE vs TUNING VOLTAGE T
A
= +25°C
MAXIMUM
MINIMUM
NOMINAL Q vs FREQUENCY
NOMINAL Q vs TUNING VOLTAGE
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
UHF, VHF Hyperabrupt Tuning Varactors
Typical Performance Curves MA4ST520 Series (Cont’d)
EQUIVALENT SERIES RESISTANCE vs
VARACTOR VOLTAGE (T
A
= +25°C)
MA4ST520, MA4ST530 Series
V3.00
TEMPERATURE COEFFICIENT OF CAPACITANCE
IN PPM/°C vs TUNING VOLTAGE
CAPACITANCE CHANGE vs AMBIENT TEMPERATURE
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
UHF, VHF Hyperabrupt Tuning Varactors
MA4ST520, MA4ST530 Series
V3.00
Typical Performance Curves MA4ST530 Series
REVERSE LEAKAGE CURRENT @ 80% V
B
vs
AMBIENT TEMPERATURE
NOMINAL CAPACITANCE vs
TUNING VOLTAGE T
A
= +25°C
NOMINAL Q vs FREQUENCY
NOMINAL Q vs TUNING VOLTAGE
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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