TRIMMER CAPACITORS
Gigahertz trimmers
GIGAHERTZ TRIMMER CAPACITORS
Description
•
Gigahertz trimmers
are tiny trimmer capacitors which provide a straight-forward technique for fine
tuning RF and microwave circuits.
•
Gigahertz trimmers
withstand the rigors of soldering heat, excessive tuning and rough handling.
As a result of the excellent dielectric and insulation properties of the sapphire or ceramic housing,
high breakdown voltage is achieved. Incorporating the self-locking constant torque drive mechanism,
they offer many improvements a fixed length, increased Q, essentially zero tuning noise and reduced
susceptibility to solder flux intrusion during installation.
•
Vertical Surface Mount Gigahertz trimmers
versions are available, with models 3, 7 and 8, offering
a good mechanical stability on the circuit board. Self resonant frequency of
Vertical surface mount
Gigahertz trimmers
versions is improving when the width of the terminal is increasing. They are
available on tape and reel with permanent sealing cap which resists intrusion of solder flux and
cleaning agents and allows easy access to the tuning rotor.
•
Surface Mount SM series
offer a rectangular outline with horizontal tuning axis.
•
Non magnetic Gigahertz trimmer
version available.
•
NEW
: Extended range Gigahertz trimmers designed for applications such as RF power amplifiers feature
a 25 to 35% size reduction
Features
•
•
•
•
•
•
•
•
•
High Q and high resonant frequency
Excellent tuning stability and low dynamic noise
2 temperature coefficients available
Very fine resolution
Resistant to soldering heat
Meet MIL-C-14409 and ESA/SCC 3010
500 VDC working voltage
High ratio capacitance/volume
Removable or permanent sealing caps
Applications
•
•
•
•
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Base station amplifier
Filter tuning
Crystal trimmIng
Impedance matching
Interstage coupling
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5-11
Vol. 1
TRIMMER CAPACITORS
Gigahertz trimmers - Standard & non magnetic trimmers
Standard Gigahertz trimmers
Characteristics
Range
See table
Voltage
Operating
temperature
Temp. Coeff.
Contact
resistance
Thermal
shock
Rated 500 VDC
Test 1000 VDC
-55°C to +125°C
See table
<0.01Ω
-55°C to +125°C
Typ. breakdown
1500 VDC
Stable over
full range
Measured
at 75%Max cap.
Low
dynamic noise
Insulating
resistance
Rotational life
Measured at 25°C
and 50% RH
Meets
MIL-C-14409
Torque size 6
7 to 60 cN.cm
Average 30 cN.cm
Sizes 7, 8 and 9
10 to 100 cN.cm Average 60 cN.cm
Vibration
60g, 10-2000 Hz
Meets MIL-STD-
202E, Method 204C
Shock
100g, 6ms
Meets MIL-STD-
202E Method 213B
Self resonant
>12 GHz
Operates B to
frequency
C band
>10
4
MΩ
@ 500 VDC
>800 revolutions
Technical data
Capacitance
Standard
range
Series
(pF)
ATX726 series
0.3 - 1.2
ATX727 series
0.6 – 4.5
ATX728 series
0.4 – 2.5
ATX729 series
0.8 – 8.0
Turns
>4
>8
>4
>16
Q factor
at Max
capacitance
>5000 @ 250 MHz
>3000 @ 250 MHz
>4000 @ 250 MHz
>3000 @ 100 MHz
Temp. Coeff. Temp. Coeff.
ppm/°C
ppm/°C
X=2
X=3
0 ± 50
350 ± 75
0 ± 50
350 ± 75
0 ± 50
350 ± 75
0 ± 75
350 ± 75
For models 7 and 8 add 0.05 pF to minimum capacitance
Standard
SM Series
AT SM 260
AT SM 270
AT SM 280
AT SM 290
Dimensions
Size
A
6
5.8
7
8.0
8
5.8
9
12.3
Capacitance
range
(pF)
0.3 - 1.2
0.6 – 4.5
0.4 – 2.5
0.8 – 8.0
B
1.9
3.0
3.0
3.0
C
2.0
3.2
2.0
6.4
Q factor
at Max
capacitance
>5000 @ 250 MHz
>3000 @ 250 MHz
>4000 @ 250 MHz
>3000 @ 100 MHz
E
1.9
2.8
2.8
2.8
F
3.0
4.2
4.2
4.2
Temp. Coeff.
ppm/°C
-50 ± 75
-50 ± 75
-50 ± 75
-50 ± 75
G
4.0
2.5
3.6
3.1
H
5.9
5.9
5.9
5.9
L
3.1
4.1
4.1
4.1
R1
2.3
2.8
2.8
2.8
R2
2.8
3.3
3.3
3.3
Turns
>4
>8
>4
>16
D
2.0
4.0
2.3
6.4
Non-magnetic Gigahertz trimmer
Description
Non magnetic Gigahertz trimmer capacitors, made of non magnetic metal silver plated, are designed
for MRI, NMR and spectroscopy applications
Characteristics
Low magnetic signature and same others characteristics as standard Gigahertz trimmer capacitors.
Technical data
Reference
Capacitance range (pF)
AT57290
0.8 – 8.0
Dimensions
Same as size 9, model 0.
5-12
Vol. 1
Turns
>16
Q factor at Max capacitance
>3000@100 MHz
Temp. Coeff.ppm/°C
350 ± 75
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TRIMMER CAPACITORS
Gigahertz trimmers
Model 0
Model 1
A
A
B DIA.
H
B
DIA.
C
Terminals: 0.2 mm x 1.0 mm (.008 x .04) size 6, 7, 8 and 9
Model 3
Model 4
A
0.4
A
1.6
B
DIA.
E
Terminal: 0.2 mm x 1.0 mm (.008x.04) size 6, 7, 8 and 9
B
DIA.
H
H
Terminal: 0.2 mm x 1.0 mm (.008 x .04) size 6
0.2 mm x 2.4 mm (.008 x .093) sizes 7.8 and 9
Model 5
Model 7
Top View
A
D
B
Flange: 3.6 mm diameter (.142) size 6
4.7 mm diameter (.185) sizes 7, 8 and 9
B
A
R
1
R
2
L
Model 8
Model 9
R
1
2
A
A
R
L
B
DIA.
F
G
B
Terminals: 0.2 mm x 1.0 mm (.008 x .04) size 6, 7, 8 and 9
SM Series
M
P
Q
Q
N
N
Dimensions SM Series
M
6.4
8.8
6.6
13.1
N
0.8
1.0
1.0
1.0
P
5.1
7.6
5.1
11.4
Q
3.0
4.0
4.0
4.0
5-13
Vol. 1
AT
AT
AT
AT
SM260
SM270
SM280
SM290
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