POE International Corp
SPECIFICATION OF POWER CHIP RESISTOR
M01-00-E-07
Ver: 1
Page:
1 of 7
ROHS compliance
WF20P
±1%, ±5%
Power chip resistors
Size 2010, 1 watt
Customer
:
Approval No :
Issue Date
:
Customer Approval :
POE International Corp
SPECIFICATION OF POWER CHIP RESISTOR
M01-00-E-07
Ver: 1
Page:
2 of 7
FEATURE
1. 1 watt high power rating and compact size
2. High reliability and stability
3. Reduced size of final equipment
4. Lead free product is available.
APPLICATION
•
•
•
•
•
•
•
Power supply
PDA
Digital meter
Computer
Automotives
Battery charger
DC-DC power converter
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 (Pb free) alloy.
Fig 1. Consctruction of Chip-R
POE International Corp
SPECIFICATION OF POWER CHIP RESISTOR
M01-00-E-07
Ver: 1
Page:
3 of 7
QUICK REFERENCE DATA
Item
Series No.
Size code
Resistance Tolerance
Resistance Range
TCR (ppm/°C)
1Ω
10Ω
≤
Rn < 9.76Ω
≤
Rn < 1MΩ
General Specification
WF20P
2010 (5025)
±5%
(E24);
±1%
(E24+E96)
1Ω ~ 10MΩ
±
300 ppm/°C
±
200 ppm/°C
±
300 ppm/°C
1W
200V
400V
55/125/56
1MΩ
≤
Rn < 10MΩ
Max. dissipation at T
amb
=70°C
Max. Operation Voltage (DC or RMS)
Max. Overload Voltage (DC or RMS)
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
RCWV
=
Rated Power
×
Resistance Value
or Max. RCWV listed above, whichever is lower.
Mechanical Data
Symbol
L
W
T
Tt
Tb
Dimensions (mm)
5.00±0.20
2.50±0.20
0.55±0.10
0.65±0.25
0.60±0.25
POE International Corp
SPECIFICATION OF POWER CHIP RESISTOR
M01-00-E-07
Ver: 1
Page:
4 of 7
Marking
Each resistor is marked with a four-digit code on the protective coating to designate the nominal
resistance value.
Example:
1R00 = 1Ω
1001 = 1000Ω
FUNCTIONAL DESCRIPTION
Product characterization
Standard values of nominal resistance are taken from the E96 & E24 series for resistors with a tolerance of
±5%
&
±1%.
The values of the E24/E96 series are in accordance with
“IEC
publication 60063”.
Derating curve
The power that the resistor can dissipate depends on the operating temperature; see Fig.2
Fig. 2 Maximum dissipation in percentage of rated power
As a function of the ambient temperature
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.
POE International Corp
SPECIFICATION OF POWER CHIP RESISTOR
M01-00-E-07
Ver: 1
Page:
5 of 7
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 230°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 WF20P
CATALOGUE NUMBERS
The resistors have a catalogue number starting with .
WF20
Size code
WF20 : 2010
P
Type code
P : High power type
472_
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%
T
Packaging code
T : 7” Reeled taping
_
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
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