Approval sheet
WA04U
±
5%,
±
1% Concave Type
General purpose chip resistors array
Size 0402x2
*Contents in this sheet are subject to change without prior notice.
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WA04U_042R_V06
Jun.2010
Approval sheet
FEATURE
1. Small size and light weight
2. Reduced size of final equipment
3. Lower surface mounted assembly costs
4. Higher component and equipment reliability
5. Strong body and terminations
6. Excellence performance in surface mounting assembly.
APPLICATION
•
•
•
Consumer electrical equipment
EDP, Computer application
Telecom
DESCRIPTION
The resistors array is constructed in a high grade ceramic body (aluminum oxide). Internal metal electrodes are
added at each end and connected by a resistive paste that 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 coat. Finally, the external end terminations are added. For ease
of soldering the outer layer of these end terminations is a Tin (lead free) solder alloy.
Fig 1. Consctruction of a Chip-R array WA04U
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Approval sheet
QUICK REFERENCE DATA
Item
Series No.
Size
Termination construction
Resistance Tolerance
Resistance Range
TCR (ppm/°C)
Max. dissipation at T
amb
=70°C
Max. Operation Voltage (DC or RMS)
Max. Overload voltage
Climatic category (IEC 60068)
Note :
1.
2.
This is the maximum voltage that may be continuously supplied to the resistor element, see “IEC publication
60115-8”
Max. Operation Voltage : So called RCWV (Rated Continuous Working Voltage) is determined by
General Specification
WA04U
0402x2 (1005x2)
Concave type
±5%, ±1%
( E24 series )
3Ω
~ 1MΩ, Jumper (0Ω)
Ω
≤ ±
300 ppm/°C
1/16 W
25V
50V
55/155/56
RCWV
=
Rated Power
×
Resistance Value
or Max. RCWV listed above, whichever is lower.
DIMENSIONS(unit : mm)
WA04U
L
W
T
P
A
Ab
B
C
D
1.00
±
0.10
1.00
±
0.10
0.30
±
0.10
0.50
±
0.05
0.35
±
0.10
0.35
±
0.10
0.25
±
0.15
0.15
±
0.10
0.25
±
0.15
A
Construction
W
B
Ta
P
T
D
Tb
R1
R2
A
b
L
R1 = R2
C
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Approval sheet
MARKING
No marking
FUNCTIONAL DESCRIPTION
Product characterization
Standard values of nominal resistance are taken from the E24 series for resistors with a tolerance of
±5%,
±1%.
The values of the E24 series are in accordance with “IEC publication 60063”
Derating
The power that the resistor can dissipate depends on the operating temperature; see Fig.2
Figure 2. Maximum dissipation in percentage of rated power
As a function of the ambient temperature
CATALOGUE NUMBERS
The resistors have a catalogue number starting with .
WA04
Size code
WA04 :
0402 per element
U
Type code
U : x 2,
concave
220_
Resistance code
5% E24 : 2 significant digits
followed by no. of zeros and
a blank
10Ω
220Ω
Jumper
=100_
=221_
=000_
J
Tolerance
J :
±5%
F :
±1%
P : Jumper
T
Packaging code
T : 7” Reel taping
B : Bulk
L
Termination code
L
=
Sn base (lead
free)
(“_” means a blank)
1%, E24+E96: 3 significant
digits followed by no. of
zeros
100Ω
37.4KΩ
=1000
=3742
1.
Reeled tape packaging : 8mm width paper taping 10,000pcs per reel.
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Approval sheet
MOUNTING
Due to their rectangular shapes and small tolerances, Surface Mountable Resistors are suitable for handling by
automatic placement systems.
Chip placement can be on ceramic substrates and printed-circuit boards (PCBs).
Electrical connection to the circuit is by individual soldering condition.
The end terminations guarantee a reliable contact.
SOLDERING CONDITION
The robust construction of chip resistors allows
them to be completely immersed in a solder bath
of 260°C for 10 seconds. Therefore, it is possible
to mount Surface Mount Resistors on one side of
a PCB and other discrete components on the
reverse (mixed PCBs).
Surface Mount Resistors are tested for
solderability at 235°C during 2 seconds. The test
condition for no leaching is 260°C for 30 seconds.
Typical examples of soldering processes that
provide reliable joints without any damage are
given in Fig 3.
Fig 3. Infrared soldering profile for Chip Resistors array
TEST CONDITION FOR JUMPER (0Ω)
Ω
Item
Power Rating At 70°C
Resistance
Rated Current
Peak Current
Operating Temperature
WA04U
1/16W
MAX.50mΩ
1A
1.5A
-55~155°C
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