LASER
TRIM
®
SMT T
UNER
C
APACITORS
K
EY
F
EATURES
•
•
•
•
•
Automates Functional Tuning
High Resolution, High Accuracy Tuning Capability
Highly Stable and Reliable After Adjustment
Small, Standard SMD Chip Sizes
Lower Placement Cost vs Mechanical
A
PPLICATIONS
• Portable Cellular Products • Wireless LAN
• Cable Modems
• RFID
• Wireless Transceivers
• Custom Applications
LASERtrim
®
tuning capacitors are laser adjustable monolithic ceramic surface mount devices for precise
functional tuning of RF circuits. LASERtrims
®
have the high reliability expected of conventional multi-layer chip
capacitors and do not experience capacitance drift, flux entrapment and other reliability concerns associated
with mechanical trimmers. Excellent post-trim Q and ESR performance are exhibited at frequencies of 100 -
2000 MHz. Offered in chip sizes 1206 and 1210 with nickel barrier terminations and tape and reel packaging,
LASERtrims
®
are compatible with high volume SMT auto-placement and reflow techniques. These high quality,
drift-free devices are ideally suited for functional tuning applications in oscillator, filter, and antenna circuits in a
variety of wireless RF products.
M
ODEL
S
ELECTION
JOHANSON
PART NUMBER
500L14N120XG4
500L15L6R0XG4
500L15N100XG4
500L15N200XG4
500L18C2R0XG4
500L18L4R0XG4
500L18L6R5XG4
500L18N100XG4
500L41C2R5XG4
500L41C3R2XG4
500L41L7R0XG4
500L41L120XG4
500L41N210XG4
CASE
SIZE
0603
0805
0805
0805
1206
1206
1206
1206
1210
1210
1210
1210
1210
CAPACITANCE
INITIAL
12.0 pF
6.0 pF
10.0 pF
20.0 pF
2.0 pF
4.0 pF
6.5 pF
10.0 pF
2.5 pF
3.2 pF
7.0 pF
12.0 pF
21.0 pF
QUALITY FACTOR
200 MHz
> 125
> 300
> 75
> 50
> 600
> 500
> 300
> 125
> 600
> 450
> 400
> 200
> 75
TUNING RANGE
12.0 - 2.00 pF
6.0 - 1.00 pF
10.0 - 1.20 pF
20.0 - 1.50 pF
2.0 - 0.50 pF
4.0 - 1.00 pF
6.5 - 1.20 pF
10.0 - 2.00 pF
2.5 - 0.50 pF
3.2 - 0.50 pF
7.0 - 1.50 pF
12.0 - 2.00 pF
21.0 - 3.00 pF
900 MHz
-----
> 35
-----
-----
> 100
> 40
> 125
> 125
> 25
-----
Initial capacitance has a tolerance of + 25% - 0%. Trim ranges are approximate and vary with laser settings and trim pattern.
Custom LASERtrims® with features and performance tailored for specific applications are available.
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33
T
UNING
D
ESCRIPTION
LASERtrim
®
tuning capacitors are used to provide
functional RF circuitry tuning. The tuning is normally
performed at a laser station integrated into the
automated assembly line at a point beyond any
operations that may significantly alter the circuit’s RF
characteristics. Tuning is performed by a computer
controlled YAG laser beam which removes or “trims”
the top electrode material of the LASERtrim
®
thereby
decreasing it’s capacitance. Circuit parameters
such as frequency or voltage are monitored during
tuning and fed back to the laser controller achieving
extremely precise results. Typical capacitance change
in relation to the amount of electrode removal is shown
in the graphs below.
STIMULUS
POWER SUPPLY &
SIGNAL GENERATOR
VISION SYSTEM
CIRCUIT
(VCO, BAND PASS FILTER
CONTROLLER
LASER BEAM
MEASUREMENT
(SPECTRUM ANALYZER,
FREQUENCY COUNTER,
LASER STATION
Sectional Diagram: Sizes L14 & L15
End Terminations
Surface Electrode
Sectional Diagram: Sizes L18 & L41
End Terminations
Surface Electrode
U.S. PATENT 5264983
Gold Plating
Nickel
Electrode
Ceramic
Gold Plating
Nickel
Electrode
Ceramic
Trimming Effect on Capacitance
0%
10%
Typical Series Resonant Frequency
10
L15N100
L18L6R5
L41N210
20%
Residual Capacitance
L18C2R0
30%
40%
50%
60%
70%
80%
90%
100%
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
L41 CAP
L18 CAP
ESR (Ohms)
1
0
5
10
15
20
25
Frequency (MHz)
Electrode Area Removed
34
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LASER
TRIM
®
T
YPICAL
RF C
HARACTERISTICS
TYPICAL QUALTIY FACTOR: L15N100
1000
0% Trim, 12.36pF
25% Trim, 8.09pF
50% Trim, 5.76pF
100% Trim, 2.19pF
TYPICAL ESR: L15N100
10
0% Trim, 12.36pF
25% Trim, 8.09pF
50% Trim, 5.76pF
100% Trim, 2.19pF
ESR (Ohms)
Q 100
1
10
0
500
1000
Frequency (MHz)
1500
2000
0.1
0
500
1000
Frequency (MHz)
1500
2000
TYPICAL QUALTIY FACTOR: L18C2R0
10000
0% Trim, 2.10pF
25% Trim, 1.55pF
50% Trim, 1.27pF
100% Trim, 0.48pF
TYPICAL ESR: L18C2R0
10
0% Trim, 2.10pF
25% Trim, 1.55pF
50% Trim, 1.27pF
100% Trim, 0.48pF
ESR (Ohms)
1000
Q
100
1
10
0
500
1000
Frequency (MHz)
1500
2000
0.1
0
500
1000
Frequency (MHz)
1500
2000
TYPICAL QUALTIY FACTOR: L18L6R5
1000
0% (7.2 pF)
25% (5.6 pF)
50% (4.1 pF)
100% (1.2 pF)
TYPICAL ESR: L18L6R5
10
0% (7.2 pF)
25% (5.6 pF)
50% (4.1 pF)
100% (1.2 pF)
ESR (Ohms)
100
Q
10
1
1
0
500
1000
Frequency (MHz)
1500
2000
0.1
0
500
1000
Frequency (MHz)
1500
2000
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35
LASER
TRIM
®
T
YPICAL
RF C
HARACTERISTICS
TYPICAL QUALITY FACTOR: L41C2R5
1000
10
TYPICAL ESR: L41C2R5
0% (3.0 pF)
25% (2.6 pF)
50% (1.8 pF)
100% (0.5 pF)
ESR (Ohms)
0% (3.0 pF)
25% (2.6 pF)
50% (1.8 pF)
100% (0.5 pF)
Q 100
1
10
0
500
1000
Frequency (MHz)
1500
2000
0.1
0
500
1000
Frequency (MHz)
1500
2000
TYPICAL QUALITY FACTOR: L41L120
1000
0% Trim, 13.58pF
25% Trim, 9.61pF
50% Trim, 5.76pF
100% Trim, 2.01pF
TYPICAL ESR: L41L120
10
0% Trim, 13.58pF
25% Trim, 9.61pF
50% Trim, 5.76pF
100% Trim, 2.01pF
ESR (Ohms)
Q 100
1
10
0
500
1000
Frequency (MHz)
1500
2000
0.1
0
500
1000
Frequency (MHz)
1500
2000
TYPICAL QUALITY FACTOR: L41N210
1000
0% Trim, 25.12 pF
25% Trim, 16.08 pF
50% Trim, 12.42 pF
100% Trim, 2.70 pF
TYPICAL ESR: L41N210
1
Q
10
ESR (Ohms)
100
0% Trim, 25.12 pF
25% Trim, 16.08 pF
50% Trim, 12.42 pF
100% Trim, 2.70 pF
1
0
500
1000
Frequency (MHz)
1500
2000
0.1
0
500
1000
Frequency (MHz)
1500
2000
36
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M
ECHANICAL
C
HARACTERISTICS
SIZE
L
W
T
x&y
E/B
E/B*
L14 (0603)
Inches
.058 ±.008
.032 ±.008
.025 MAX
.004 MIN
.005 MAX
.012 MAX
(mm)
(1.47 ±.20)
(0.81 ±.20)
(0.64 MAX)
(0.10 MIN)
(0.13 MAX)
(0.30 MAX)
N/A (L14 Only)
N/A (L14 Only)
L15 (0805)
Inches
.080 ±.008
.050 ±.008
.025 ±.005
.004 MIN
.005 MIN
(mm)
(2.00 ±.20)
(1.27 ±.20)
(0.64 ±.13)
(0.10 MIN )
(0.13 MIN )
L18 (1206)
Inches
.122 ±.008
.060 ±.008
.025 ±.005
.004 MIN
.005 MIN
(mm)
(3.09 ±.20)
(1.52 ±.20)
(0.64 ±.13)
(0.10 MIN )
(0.13 MIN )
L41 (1210)
Inches
.130 ±.008
.100 ±.008
.025 ±.005
.004 MIN
.005 MIN
(mm)
(3.30 ±.20)
(2.54 ±.20)
(0.64 ±.13)
(0.10 MIN )
(0.13 MIN )
Top View
Side View
Bottom View
W
y
x
E/B
L
T
E/B*
E
LECTRICAL
C
HARACTERISTICS
WORKING VOLTAGE:
TEMPERATURE COEFFICIENT:
DISSIPATION FACTOR:
INSULATION RESISTANCE:
DIELECTRIC STRENGTH:
TEST PARAMETERS:
ENVIRONMENTAL:
50 Volts DC
0 ± 30ppm /°C, -55 to 125°C
.001 (0.1%) max, 25°C
> 10 G @ 25°C,WVDC;
125°C IR is 10% of 25°C rating.
2.5 X WVDC, 25°C, 50 mA max
1MHz ±50kHz, 1.0±0.2 VRMS, 25°C
Meets
1.0%
Capacitance Change
0.5%
0.0%
-0.5%
-1.0%
-55
-30
-5
20
45
70
95
120
Temperature (°C)
H
OW TO
O
RDER
500
VOLTAGE
Standard Voltage:
500 = 50 V
L41
CASE SIZE
See Chart
DIELECTRIC
N,L = NPO
C = HI-Q NPO
N
210
PRE-TRIM CAPACITANCE
1st two digits are significant; third
digit denotes number of zeros, R =
decimal point.
2R0 = 2.0 pF
210 = 21 pF
X
TOLERANCE
Initial
capacitance
tolerance is
+25% -0%
G
TERMINATION
G = Gold flashed
4
T
TAPE MODIFIER
Tape
Code
T
R
Tape
Type
Paper
Paper
Reel
Size
7”
13”
MARKING
Part marking not
available this series
Tape specs. per EIA RS481.
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37
Test/Measurement
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