Approval sheet
WF04P
±
1%,
±
5%
High Power Chip Resistors
Size 0402
*Contents in this sheet are subject to change without prior notice.
Page 1 of 7
ASC_WF04P_V02
Jan.2011
Approval sheet
FEATURE
1. High Power and stability
2. Reduced size of final equipment
3. Lower assembly costs
4. Higher component and equipment reliability
5. RoHS compliant and Lead free products
APPLICATION
•
•
•
•
Consumer electrical equipment
Automotive application
EDP, Computer application
Telecom application
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
within tolerance by laser cutting 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 Tin (lead free) alloy.
Fig 1. Consctruction of a Chip-R
Page 2 of 7
ASC_WF04P_V02
Jan.2011
Approval sheet
QUICK REFERENCE DATA
Item
Series No.
Size code
Resistance Range
Resistance Tolerance
TCR (ppm/°C)
°
R = 1MΩ
Ω
10Ω < R < 1MΩ
Ω
Ω
R
≦
10Ω
Ω
Max. dissipation @ T
amb
=70°C
°
Max. Operation Voltage (DC or RMS)
Max. Overload Voltage (DC or RMS)
Climatic category
Note :
1.
2.
3.
4.
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
≤ ±
200
≤ ±
100
≤
-200 ~ + 400
≤ ±
200
≤ ±
200
≤
-200 ~ +400
General Specification
WF04P
0402 (1005)
1Ω~1MΩ (±5%,
±
1%), Jumper
Ω
Ω ±
±
1% E96/E24
±
5% E24
1/8 W
50V
100V
55/155/56
RCWV
=
Rated Power
×
Resistance Value
or Max. RCWV listed above, whichever is lower.
The resistance of Jumper is defined <0.05Ω.
DIMENSIONS
(unit : mm)
WF04P
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
Page 3 of 7
ASC_WF04P_V02
Jan.2011
Approval sheet
MARKING
No marking for WF04P
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 for WR04X
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.
Page 4 of 7
ASC_WF04P_V02
Jan.2011
Approval sheet
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 245°C during 3 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
CATALOGUE NUMBERS
The resistors have a catalogue number starting with .
WF04
Size code
WF04 : 0402
P
Type code
472_
Resistance code
±5%,
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
: 7” Reeled taping
L
Termination
code
L
=
Sn base
(lead free)
P : 0402 1/10W
Q : 10” Reeled taping
G : 13” Reeled taping
B
: Bulk
(“_” means a blank)
±1%,
E96: 3 significant
digits followed by no.
of zeros
102Ω
37.4KΩ
=1020
=3742
1.
2.
Reeled tape packaging : 8mm width paper taping 10000pcs per 7” reel.
Bulk packaging
: 10,000pcs per poly-bag
Page 5 of 7
ASC_WF04P_V02
Jan.2011
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