LASER
TRIM
®
SMT T
UNER
C
APACITORS
K
ey
F
eaTuReS
•
•
•
•
•
•
RoHS Compliant Parts Available
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 0603 to 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
RoHS P/N
500L14N6R0XG4
500L14N100XG4
500L14N120XG4
500L15M6R0XG4
500L15N100XG4
500L15N200XG4
500L18S2R0XG4
500L18M3R0XG4
500L18M4R0XG4
500L18M6R5XG4
500L18N100XG4
500L41S2R5XG4
500L41S3R2XG4
500L41M7R0XG4
101L41M7R0XG4
500L41M120XG4
500L41N210XG4
EIACase Size
0603
0603
0603
0805
0805
0805
1206
1206
1206
1206
1206
1210
1210
1210
1210
1210
1210
CAPACITANCE
Initial
Tuning Range
6.0 pF
10.0 pF
12.0 pF
6.0 pF
10.0 pF
20.0 pF
2.0 pF
3.0 pF
4.0 pF
6.5 pF
10.0 pF
2.5 pF
3.2 pF
7.0 pF
7.0 pF
12.0 pF
21.0 pF
6.0 - 1.00 pF
10.0 - 2.00 pF
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
3.0 - 1.0 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
7.0 - 1.50 pF
12.0 - 2.00 pF
21.0 - 3.00 pF
QUALITY FACTOR
200 MHz
900 MHz
> 40
> 125
> 125
> 300
> 75
> 50
> 600
> 500
> 500
> 300
> 125
> 600
> 450
> 400
> 400
> 200
> 75
---
---
---
> 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.
46
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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
LASER STATION
MEASUREMENT
(SPECTRUM ANALYZER,
FREQUENCY COUNTER,
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
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47
LASER
TRIM
®
T
ypiCal
RF C
HaRaCTeRiSTiCS
TYPICAL QUALITY FACTOR: L15N100
1000
0% Trim, 12.36pF
25% Trim, 8.09pF
50% Trim, 5.76pF
100% Trim, 2.19pF
0% Trim, 12.36pF
25% Trim, 8.09pF
50% Trim, 5.76pF
100% Trim, 2.19pF
TYPICAL ESR: L15N100
10
ESR (Ohms)
Q 100
1
10
0.1
0
500
1000
Frequency (MHz)
1500
2000
0
500
1000
Frequency (MHz)
1500
2000
TYPICAL QUALITY 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
0.1
0
500
1000
Frequency (MHz)
1500
2000
0
500
1000
Frequency (MHz)
1500
2000
TYPICAL QUALITY 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
0.1
0
500
1000
Frequency (MHz)
1500
2000
0
500
1000
Frequency (MHz)
1500
2000
For L41 size electrical characteristics and graphs, please contact the factory.
48
www.johansontechnology.com
M
ECHANICAL
C
HARACTERISTICS
SIZE
L
W
T
x&y
E/B
E/B*
L14 (EIA 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)
L15 (EIA 0805)
Inches
.080 ±.008
.050 ±.008
(mm)
(2.00 ±.20)
(1.27 ±.20)
L18 (EIA 1206)
Inches
.122 ±.008
.060 ±.008
(mm)
(3.09 ±.20)
(1.52 ±.20)
L41 (EIA 1210)
Inches
.130 ±.008
.100 ±.008
(mm)
(3.30 ±.20)
(2.54 ±.20)
.025 ±.005
(0.64 ±.13)
.004 MIN
(0.10 MIN )
.005 MIN
(0.13 MIN )
N/A (L14 Only)
.025 ±.005
(0.64 ±.13)
.004 MIN
(0.10 MIN )
.005 MIN
(0.13 MIN )
N/A (L14 Only)
.025 ±.005
(0.64 ±.13)
.004 MIN
(0.10 MIN )
.005 MIN
(0.13 MIN )
N/A (L14 Only)
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 GΩ @ 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 the mechanical & environmental
characteristics as given for the JTI S-
Series capacitors (see second page of
S-Series specification sheet), except
terminal adhesion for all sizes is > 2.0 lbs.
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
L = NPO
C = HI-Q NPO
N, M = RoHS
NPO
S = RoHS 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
Nickel Barrier
MARKING
Part marking not
available this series
4
Tape
Code
T
R
T
TAPE MODIFIER
Tape
Type
Paper
Paper
Reel
Size
7”
13”
Tape specs. per EIA RS481.
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49
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