Walsin Technology Corporation
WR04X
±1%, ±5%
General purpose chip resistors
Size 0402
Customer
:
Approval No :
Issue Date
:
Customer Approval :
Page 1 of 7
WR04X
Version 13
Nov.-2006
Walsin Technology Corporation
FEATURE
1. Small size and light weight
2. High reliability and stability
3. Reduced size of final equipment
4. Lower assembly costs
5. Higher component and equipment reliability
6. Lead free product is available
APPLICATION
•
•
•
•
•
Mobile phone
PDA
Camcorders
Pagers
Palmtop computers
DESCRIPTION
The resistors are 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
nominated value within tolerance which controlled by laser trimming of this resistive layer.
The resistive layer is covered with a protective coat. Finally, the two external end terminations are added. For
ease of soldering the outer layer of these end terminations is a Lead-tin or Tin (Lead free) alloy.
Fig 1. Consctruction of Chip-R WR04
Page 2 of 7
WR04X
Version 13
Nov.-2006
Walsin Technology Corporation
QUICK REFERENCE DATA
Item
Series No.
Size code
Resistance Range
Resistance Tolerance
General Specification
WR04
0402(1005)
1Ω~10MΩ(±5% tolerance),10Ω~1MΩ(±1% tolerance), Jumper
±1%
E96/E24
±5%
E24
TCR (ppm/°C)
R≥1MΩ
1MΩ＞R＞10Ω
≤ ±
200
-300~+500
≤ ±
200
R≤10Ω
Max. dissipation @
T
amb
=70°C
Max. Operation Voltage
(DC or RMS)
Max. Overload Voltage
(DC or RMS)
Climatic category (IEC
60068)
Note :
1.
2.
-300~+500
-300~+500
1/16 W
50V
100V
55/155/56
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
RCWV
=
Rated Power
×
Resistance Value
or Max. RCWV listed above, whichever is lower.
3.
For Resistance range 1Ω~10Ω and 1MΩ~10MΩ of tolerance
±1%
series No. is WR04W, please refer to
specification respectively.
Dimensions:
WR04X
L
W
T
Tb
Tt
1.00
±
0.05
0.50
±
0.05
0.35
±
0.05
0.25
±
0.10
0.20
±
0.10
W T
L
T
End termination
Tb
Tt
Resistive layer
Ceramic S
ubstrate
Protec tive c oat
Page 3 of 7
WR04X
Version 13
Nov.-2006
Walsin Technology Corporation
MARKING
WR04 has no marking on the product overcoat for both 5% & 1%.
FUNCTIONAL DESCRIPTION
Product characterization
Standard values of nominal resistance are taken from the E24 series for resistors with a tolerance of
±5%,
and E96 series for resistors with a tolerance of
±1%.
The values of the E24/E96 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 :
WR04
Size code
WR04 : 0402
Type code
X : Normal
W : Out of resistance
range (1% of 1Ω ~
10Ω, 1MΩ~ 10MΩ)
X
3742
Resistance code
E24 : 2 significant digits
followed by no. of
zeros and a blank
4.7Ω
10Ω
220Ω
Jumper
=4R7_
=100_
=221_
=000_
J
Tolerance
F :
±1%
J :
±5%
P : Jumper
T
Packaging code
T
B
: 7” Reeled taping
: Bulk
_
Termination code
_ = SnPb base (“_”
means a blank)
L
=
Sn base (lead
free)
(“_” means a blank)
E96 : 3 significant digits
followed by no. of
zeros
102Ω
37.4KΩ
=1020
=3742
1.
2.
Reeled tape packaging : 8mm width paper taping 10,000pcs per reel.
Bulk packaging
: 10,000pcs per poly-bag
Page 4 of 7
WR04X
Version 13
Nov.-2006
Walsin Technology Corporation
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 one minute. 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 60
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 WR04X
TEST CONDITION FOR JUMPER (0
Ω)
Item
Power Rating At 70°C
Resistance
Rated Current
Peak Current
Operating Temperature
WR04X
1/16W
MAX. 50mΩ
1A
1.5A
-55~155°C
Page 5 of 7
WR04X
Version 13
Nov.-2006
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