DATA SHEET
LOW-OHMIC CHIP RESISTORS
LRC21/22
5%; 1%
size 0603
Product Specification – Jan 15, 2004 V.4
Phycomp
Product specification
Low-ohmic chip resistors
size 0603
FEATURES
•
Reduced size of final equipment
•
Low assembly costs
•
Higher component and equipment
reliability
APPLICATIONS
•
Power supply in small equipment
•
Digital multimeter
•
Telecommunication
•
Computers
•
Automotive industry
•
Medical and military equipment.
DESCRIPTION
The resistors are constructed on a
high grade ceramic body (aluminium
oxide). Internal metal electrodes are
added at each end and connected
by a resistive paste which is applied
to the top surface of the substrate.
The composition of the paste is
adjusted to give the approximate
resistance required and the value is
trimmed to within tolerance by laser
cutting of this resistive layer.
The resistive layer is covered with a
protective coating and printed with
the resistance value. Finally, the two
external end terminations are added.
For ease of soldering the outer layer
of these end terminations is a lead-
tin alloy.
The outlines and dimensions of the
resistor are given in Fig.2.
ORDERING INFORMATION
Table 1
Ordering code indicating type and packing
QUICK REFERENCE DATA
DESCRIPTION
Resistance range
Resistance tolerance
Temperature coefficient:
0.01
Ω ≤
R
<
0.04
Ω
0.04
Ω ≤
R
<
0.10
Ω
0.10
Ω ≤
R
<
0.30
Ω
0.30
Ω ≤
R
<
0.51
Ω
0.51
Ω ≤
R
<
1Ω
Absolute maximum at T
amb
= 70
°C
Maximum permissible voltage
Climatic category (IEC 60068)
Basic specification
≤ ±1500 ×
10
−6
/K
≤ ±1000 ×
10
−6
/K
≤ ±800 ×
10
−6
/K
≤ ±600 ×
10
−6
/K
≤ ±300 ×
10
−6
/K
0.1 W
50 V (DC or RMS)
55/125/56
IEC 60115-8
±5%; ±1%
LRC21/22
5% 1%
VALUE
0.01
Ω
to 0.99
Ω;
E24 series
ORDERING CODE 2350 512 …..
TYPE
LRC21
LRC22
RESISTANCE
RANGE
0.01 to 0.99
Ω
0.01 to 0.99
Ω
TOL.
(%)
±5
±1
Table 2
CARDBOARD TAPE ON REEL
5000 UNITS
10…
12…
Last digit of 12NC
LAST DIGIT
0
7
Ordering code (12NC)
•
The resistors have a 12-digit
ordering code starting with
2350 512.
•
The subsequent 2 digits indicate
the resistor type and packing;
see Table 1.
•
The remaining 3 digits indicate the
resistance value:
−
The first 2 digits indicate the
resistance value.
−
The last digit indicates the
resistance decade in
accordance with Table 2.
RESISTANCE
0.01 to 0.099
Ω
0.10 to 0.99
Ω
O
RDERING EXAMPLE
The ordering code of an LRC22 low-
ohmic resistor, value 0.22
Ω
with a
1% tolerance, supplied on cardboard
tape of 5000 units per reel is:
2350 512 12227.
2004 Jan 15 Rev.4
2
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Phycomp
Product specification
Low-ohmic chip resistors
size 0603
FUNCTIONAL DESCRIPTION
Product characterization
The resistors are available in the
E24 series for resistors with a
tolerance of
±5%
or
±1%.
The values
of the E24 series are in accordance
with
“IEC publication 60063”.
Limiting values
TYPE
LIMITING
LIMITING
(1)
POWER
VOLTAGE
(W)
(V)
50
50
0.1
0.1
0
−55
0
50
70
100 125
T
amb
(°C)
50
LRC21/22
5% 1%
D
ERATING
The power that the resistor can dissipate depends on the operating
temperature; see Fig.1.
P
max
(%P
rated
)
100
CCB413
LRC21
LRC22
Note
1. This is the maximum voltage that
may be continuously applied to
the resistor element, see
“IEC publication 60115-8”.
Fig.1
Maximum dissipation (P
max
) in percentage of rated power as a
function of the ambient temperature (T
amb
).
2004 Jan 15 Rev.4
3
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Phycomp
Product specification
Low-ohmic chip resistors
size 0603
MECHANICAL DATA
Mass per 100 units
TYPE
LRC21
LRC22
Marking
The resistors are not marked for the
E96 series and are marked with a
3-digit code for the E24 series on the
protective coating to designate the
nominal resistance value.
3-D
IGIT
M
ARKING
The R is used as a decimal point.
Example
MARKING
R10
R22
R82
P
ACKAGE MARKING
The packing is also marked and
includes resistance value, tolerance,
catalogue number, quantity,
production period, batch number and
source code.
RESISTANCE
0.10
Ω
0.22
Ω
0.82
Ω
For dimensions see Table 3.
CCC317
LRC21/22
5% 1%
Outlines
MASS
(g)
0.21
0.21
T
protective coat
resistor layer
inner electrode
end termination
ceramic substrate
t
b
protective coat
t
t
marking
W
R10
L
Fig.2
Outlines.
Table 3
TYPE
LRC21
LRC22
Chip resistor type and relevant physical dimensions; see Fig.2
L
(mm)
1.6
±0.10
W
(mm)
0.80
±0.10
T
(mm)
t
t
(mm)
t
b
(mm)
0.25
±0.15
0.45
±0.10
0.25
±0.15
2004 Jan 15 Rev.4
4
www.yageo.com
Phycomp
Product specification
Low-ohmic chip resistors
size 0603
TEST AND REQUIREMENTS
Essentially all tests are carried out in
accordance with the schedule of
“IEC publication 60115-8”,
category
55/125/56 (rated temperature range
−55
to
+125 °C;
damp heat, long
term, 56 days). The testing also
covers the requirements specified by
EIA and EIAJ.
The tests are carried out in
accordance with IEC publication
60068,
“Recommended basic
Table 4
climatic and mechanical robustness
testing procedure for electronic
components”
and under standard
atmospheric conditions according to
“IEC 60068-1”,
subclause 5.3.
Unless otherwise specified the
following values apply:
Temperature: 15
°C
to 35
°C
Relative humidity: 45% to 75%
Air pressure: 86 kPa to 106 kPa
LRC21/22
5% 1%
In Table 4 the tests and
requirements are listed with
reference to the relevant clauses of
“IEC publications 60115-8 and
60068”;
a short description of the
test procedure is also given. In some
instances deviations from the IEC
recommendations were necessary
for our method of specifying.
All soldering tests are performed
with mildly activated flux.
Test procedures and requirements
IEC
60068-2
TEST
METHOD
IEC
60115-8
CLAUSE
TEST
PROCEDURE
REQUIREMENTS
Tests in accordance with the schedule of IEC publication 60115-8
4.4.1
4.5
visual
examination
resistance
applied voltage (+0/−10%):
R
<
10
Ω:
0.1 V
10
Ω ≤
R
<
100
Ω:
0.3 V
100
Ω ≤
R
<
1 kΩ: 1 V
1 kΩ
≤
R
<
10 kΩ: 3 V
10 kΩ
≤
R
<
100 kΩ: 10 V
100 kΩ
≤
R
<
1 MΩ: 25 V
R
≥
1 MΩ: 50 V
4.18
4.29
20 (Tb)
45 (Xa)
resistance to
soldering heat
component
solvent resistance
solderability
unmounted chips: 10
±1
s; 260
±5 °C
isopropyl alcohol; H
2
O followed by
brushing in accordance with
“MIL 202 F”
unmounted chips completely
immersed for 2
±0.5
s in a solder
bath at 235
±2 °C
maximum voltage (RMS) during
1 minute metal block method
room temperature;
dissipation 6.25
×
P
n
;
5 s (voltage not more than 2
×
V
max
)
no visible damage
∆R/R
max.:
±1%
no visible damage
no holes; clean surface;
no damage
R
−
R
nom
: max.
±5%
4.17
20 (Ta)
good tinning
(≥95% covered);
no damage
no breakdown or flashover
no visible damage
∆R/R
max.:
±1%
4.7
4.13
voltage proof
on insulation
short time
overload
2004 Jan 15 Rev.4
5
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