M A COM MA4ST250-287, MA4ST250-1146, MA4ST250-1141, MA4ST240CK-287, MA4ST240CK-1146 Datasheet
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Low-Voltage / High Q Si Hyperabrupt Varactors MA4ST200 Series
M/A-COM Division of AMP Incorporated Q North America: Tel. (800) 366-2266, Fax (800) 618-8883 Q Asia/Pacific: Tel.+85 2 2111 8088, Fax +85 2 2111 8087
Q Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020
www.macom.com
AMP and Connecting at a Higher Level are trademarks.
Specifications subject to change without notice.
Features
•
Surface Mount Packages
(SOT-23, SOT-323, SOD-323)
•
High Q at Low Voltages
•
High Capacitance Ratio at Low Voltages
•
SPC Process for Superior C-V Repeatability
•
Available as Single and Common Cathode Pairs
•
Tape and Reel Packaging
•
Designed for Commercial Wireless Applications
Description
M/A-COM’s MA4ST200 series is a ion-implanted, hyperabrupt
junction, silicon tuning varactors in SOT-23, SOT-323, and SOD323 surface mount packages. This series of varactors is designed
for high Q and low voltage operation. Each varactor type has a Q
greater than 400 at -2 V.
Applications
The MA4ST200 series tuning varactors are useful for wide band
tuning and low phase noise applications where the supply voltage
is limited to 5 volts or less. These varactors have been specifically designed for use in the wireless communications up to the
2.4 GHz band. Applications include VCOs and voltage tuned
filters.
Configurations
0.25 0.5 0.75 1.0 2.0 3.0
250
FREQUENCY (GHz)
-
&7
107
$036
7$&6
107
,6
*60
3'&
&7
$FWLYH3DJHUV
'(&7
3+3
'&6
:/$1
*36
3&6
605
240
230
TYPICAL DEVICE SELECTION by FREQUENCY
Low-Voltage / High Q
Si H
yp
erabrupt Varactors
MA4ST200 Series
TOP VIEW (SOT-23, SOT-323)
Single Double
TOP VIEW (SOD-323)
Spice Model
Ls
Cp
Cj
Rs
Package
Parasitics
Parasitics:
Cp= 0.15 pF
Ls= 0.10 nH
Intrinsic Diode
Model:
N = 1.1
CJ0=(see table below)
VJ = (see table below)
FC = 0.5
BV = 12.0 V
M = (see table below)
Part No. CJO (pF) VJ (V) M
MA4ST230 12.0 4.085 2.228
MA4ST250 8.16 4.930 2.520
MA4ST250 6.19 4.774 2.458
Low-Voltage / High Q Si Hyperabrupt Varactors MA4ST200 Series
M/A-COM Division of AMP Incorporated Q North America: Tel. (800) 366-2266, Fax (800) 618-8883 Q Asia/Pacific: Tel.+85 2 2111 8088, Fax +85 2 2111 8087
Q Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020
www.macom.com
AMP and Connecting at a Higher Level are trademarks.
Specifications subject to change without notice.
1.00E+02
1.00E+03
1.00E-01 1.00E+00 1.00E+01
REVERSE VOLTAGE (V)
NOMINAL Q
MA4ST240
MA4ST250
MA4ST230
200
300
400
500
600
700
02468
REVERSE VOLTAGE (V)
TCC(PPM/°C)
Absolute Maximum Ratin
g
Parameter Absolute Maximum
Reverse Voltage 12 Volts
Forward Current 50 mA
Total Power Dissipation 250 mW
Junction Operating Temp. -55°C to +125°C
Storage Temperature -55°C to +125°C
Typical Performance Curves
TOTAL CAPACITANCE vs REVERSE VOLTAGE at 1 MHz
NOMINAL Q at 50 MHz vs R EVERSE VOLTAGE
NOMINAL CHANGE in CAPACITANCE with
TEMPERATURE
Electrical Specifications @ TA = +25°C
Breakdown Voltage @ IR = 10 µA, Vb = 12 V Minimum
Reverse Leakage Current @ V
R
= 10 V, IR = 100 nA Maximum
0.1
1
10
100
0.1 1 10
REVERSE VOLTAGE (V)
TOTAL CAPACITANCE (pF)
MA4ST230
MA4ST250
MA4ST240
Ordering Information
These varactors are available in the three case styles shown.
When ordering, specify the desired case style by adding the
case designation (287 for SOT-23, 1146 for SOT-323, 1141
for SOD-323) as a suffix to the model number. For example,
MA4ST230-1141 specifies the MA4ST230 varactor in the
SOD-323 package. The model number indicated is for a single
varactor. Common cathode pairs are available in SOT-23
package, and are specified by adding “CK” to the end of the
model number. For example MA4ST230CK-287 specifies the
MA4ST230 varactor in common cathode pairs.
C
T
C
T
Capacitance Rat io Q Factor
(pF) (pF)
Part f = 1 MHz, V
R
= 2.0V f = 1 MHz, VR = 4.0V C
T-0.5/CT-4.0
f = 50 MHz, VR = 2.0V
Number Min. Nom. Max. Max. Typ. Min.
MA4ST230 4.5 5.0 6.0 3.1 3.5 400
MA4ST240 3.0 3.5 4.2 2.3 3.5 450
MA4ST250 2.3 2.7 3.5 1.8 3.5 450
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