Surface Mount Hyperabrupt
Wide-Band Tuning Varactors
MA4ST079 thru 083
V3.00
M/A-COM, Inc.
North America:
Tel. (800) 366-2266
s
Asia/Pacific: Tel. +81 3 3263 8761
s
Europe: Tel. +44 (1344) 869 595
Fax (800) 618-8883
Fax +81 3 3263 8769
Fax +44 (1344) 300 020
1
Specifications Subject to Change Without Notice.
Features
q
Low Cost
q
Very High Capacitance Ratio from 1 to 8 Volts
q
Surface Mount Package
q
High Quality Factor
q
Useful for Battery Applications
q
SPC Monitored Ion Implantation for Excellent
C-V Repeatability
q
Singles and Common Cathode Pairs
q
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.
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.
SOT-23
Configurations
TOP VIEW
(SINGLE)
(COMMON CATHODE PAIR)
Surface Mount Hyperabrupt Wide-Band Tuning Varactors
MA4ST079 thru 083
V3.00
M/A-COM, Inc.
North America:
Tel. (800) 366-2266
s
Asia/Pacific: Tel. +81 3 3263 8761
s
Europe: Tel. +44 (1344) 869 595
Fax (800) 618-8883
Fax +81 3 3263 8769
Fax +44 (1344) 300 020
2
Specifications Subject to Change Without Notice.
Electrical Specifications
@ 25C
Breakdown Voltage @ I
R
= 10 A, 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
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
Parameter
Absolute Maximum
Reverse Voltage
12 Volts
Junction Temperature
-65C to +125C
Storage Temperature
-65C to +125C
Forward Current
50 mA
Power Dissipation
50 mW @ 25C
Minimum
Maximum
Maximum
Typical
Model
Total Capacitance
Total Capacitance
Total Capacitance
Total Capacitance
Total Capacitance
Typical
Number
(pF)
(pF)
(pF)
(pF)
Ratio C
T1
/C
T8
Q
f = 1 MHz
f = 1 MHz
f = 1 MHz
f = 1 MHz
f = 1 MHz
f = 50 MHz
V
R
= 1 Volt
V
R
= 2.5 Volts
V
R
= 4 Volts
V
R
= 8 Volts
V
R
= 1/ V
R
=8
V
R
= 4 Volts
min. max.
MA4ST079
87.4
48.7
59.5
27.3
11.8
9.1
80
MA4ST080
40.0
22.3
27.3
13.1
5.5
8.9
150
MA4ST081
16.2
9.1
11.1
5.2
2.4
8.5
300
MA4ST082
11.5
6.6
8.0
3.8 1.8
8.2
350
MA4ST083
7.9
4.5
5.5
2.6
1.3
7.8
450
Absolute Maximum Ratings
@ 25C
Surface Mount Hyperabrupt Wide-Band Tuning Varactors
MA4ST079 thru 083
M/A-COM, Inc.
North America:
Tel. (800) 366-2266
s
Asia/Pacific: Tel. +81 3 3263 8761
s
Europe: Tel. +44 (1344) 869 595
Fax (800) 618-8883
Fax +81 3 3263 8769
Fax +44 (1344) 300 020
3
Specifications Subject to Change Without Notice.
V3.00
NOMINAL Q vs REVERSE VOLTAGE
Typical Performance Curves
TOTAL CAPACITANCE vs REVERSE VOLTAGE
Package Capacitance = 0.15 pF typical
Package Inductance = 2 nH typical
Case Style
SOT-23 (High Profile)
Note:
1. Applicable on all sides
INCHES
MILLIMETERS
DIM.
MIN.
MAX.
MIN.
MAX.
A
--
0.048
--
1.22
B
--
0.008
--
0.20
C
--
0.040
--
1.00
D
0.013
0.020
0.35
0.50
E
0.003
0.006
0.08
0.15
F
0.110
0.119
2.80
3.00
G
0.047
0.056
1.20
1.40
H
0.037 typical
0.95 typical
J
0.075 typical
1.90 typical
K
0.103
2.60
L
0.024
0.60
DIM.
GRADIENT
M
10 max.
1
N
2...30
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