Surface Mount Hyperabrupt
Wide-Band Tuning Varactors
Features
q
q
q
q
q
q
MA4ST079 thru 083
V3.00
SOT-23
q
q
Low Cost
Very High Capacitance Ratio from 1 to 8 Volts
Surface Mount Package
High Quality Factor
Useful for Battery Applications
SPC Monitored Ion Implantation for Excellent
C-V Repeatability
Singles and Common Cathode Pairs
Available in Tape and Reel
Description
The MA4ST079 through MA4ST083 series of silicon
hyperabrupt junction tuning varactors is produced with
ion implantation and advanced epitaxial growth tech-
niques. These diodes have thermal oxide passivation, and
feature very high capacitance ratio and quality factor.
They are well suited for use from the sub-HF through
UHF frequency range. The standard capacitance toler-
ance is ±10%, with tighter tolerances available.
Capacitance matching at one or more bias voltages is
also available.
Configurations
TOP VIEW
(SINGLE)
Applications
The MA4ST079 through MA4ST083 series of hyperabrupt
junction tuning varactors is suggested for usage where a
large frequency change is required with only a small
change in tuning voltage.
This series is appropriate for usage in wide band voltage
controlled oscillators and voltage controlled filters which
require the largest rate of change of capacitance with
voltage. The large change in capacitance from 1 to 8
volts makes them very attractive for battery operated or
other systems with limited available control voltage.
The MA4ST079 through MA4ST083 family can be used in
VCOs and VTFs from approximately 100 KHz through the
UHF frequency band.
(COMMON CATHODE PAIR)
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 3 3263 8761
Fax +81 3 3263 8769
s
Europe: Tel. +44 (1344) 869 595
Fax +44 (1344) 300 020
Surface Mount Hyperabrupt Wide-Band Tuning Varactors
Electrical Specifications
@ 25°C
Breakdown Voltage @ I
R
= 10 µA, VB = 12 Volts Minimum
Reverse Leakage Current @ V
R
= 10 Volts, I
R
= 100 nA Maximum
Temperature Coefficient ot Capacitance @ V
R
= 8 Volts, TCC = 400 ppm/°C Typical
Model
Number
Minimum
Total Capacitance
(pF)
f = 1 MHz
V
R
= 1 Volt
Total Capacitance
(pF)
f = 1 MHz
V
R
= 2.5 Volts
min.
max.
48.7
22.3
9.1
6.6
4.5
59.5
27.3
11.1
8.0
5.5
Maximum
Maximum
Total Capacitance Total Capacitance
(pF)
(pF)
f = 1 MHz
V
R
= 4 Volts
f = 1 MHz
V
R
= 8 Volts
MA4ST079 thru 083
V3.00
Typical
Total Capacitance
Ratio C
T1
/C
T8
f = 1 MHz
V
R
= 1/ V
R
=8
Typical
Q
f = 50 MHz
V
R
= 4 Volts
MA4ST079
MA4ST080
MA4ST081
MA4ST082
MA4ST083
87.4
40.0
16.2
11.5
7.9
27.3
13.1
5.2
3.8
2.6
11.8
5.5
2.4
1.8
1.3
9.1
8.9
8.5
8.2
7.8
80
150
300
350
450
Absolute Maximum Ratings
@ 25°C
Parameter
Reverse Voltage
Junction Temperature
Storage Temperature
Forward Current
Power Dissipation
Absolute Maximum
12 Volts
-65°C to +125°C
-65°C to +125°C
50 mA
50 mW @ 25°C
Ordering Information
The part numbers shown are for single diodes. When
ordering diodes in common cathode pairs add suffix
“CK.” For example, MA4ST079CK specifies model num-
ber MA4ST079 as a common cathode pair. To order parts
on tape and reel add suffix T/R to the end of the part
number. i.e. MA4ST079-T/R
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 3 3263 8761
Fax +81 3 3263 8769
s
Europe: Tel. +44 (1344) 869 595
Fax +44 (1344) 300 020
Surface Mount Hyperabrupt Wide-Band Tuning Varactors
MA4ST079 thru 083
V3.00
Case Style
SOT-23 (High Profile)
DIM.
A
B
C
D
E
F
G
Package Capacitance = 0.15 pF typical
Package Inductance = 2 nH typical
INCHES
MIN.
—
—
—
0.013
0.003
0.110
0.047
MAX.
0.048
0.008
0.040
0.020
0.006
0.119
0.056
MILLIMETERS
MIN.
—
—
—
0.35
0.08
2.80
1.20
MAX.
1.22
0.20
1.00
0.50
0.15
3.00
1.40
H
J
K
L
DIM.
M
N
0.037 typical
0.075 typical
0.103
0.024
GRADIENT
10° max.
1
2°…30º
0.95 typical
1.90 typical
2.60
0.60
Note:
1. Applicable on all sides
Typical Performance Curves
TOTAL CAPACITANCE vs REVERSE VOLTAGE
NOMINAL Q vs REVERSE 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 3 3263 8761
Fax +81 3 3263 8769
s
Europe: Tel. +44 (1344) 869 595
Fax +44 (1344) 300 020
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