POE International Corp
SPECIFICATION OF HIGH POWER CHIP RESISTOR
M01-00-E-07
Ver: 1
Page:
1 of 7
ROHS compliance
WF08P
±1%, ±5%,
0Ω
High Power Chip Resistors
Size 0805 1/4W
Customer
Approval No
Issue Date
:
:
:
Customer Approval :
POE International Corp
SPECIFICATION OF HIGH POWER CHIP RESISTOR
M01-00-E-07
Ver: 1
Page:
2 of 7
FEATURE
1. Small size and light weight
2. High reliability and stability
3. Reduced size of final equipment
4. High precision
5. Lead free termination upon customer requested
APPLICATION
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High accuracy dc-power supply
Digital multi-meter
Telecommunication
Computer
Automotive industry
Medical and military equipment
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
POE International Corp
SPECIFICATION OF HIGH 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) -55°C ~ +155°C
Ø
Ø
10
Ω
<= 10
Ω
≤ ±
200 ppm/°C
- 300 ~ + 500 ppm/°C
1/4 W
150V
55/155/56
JIS C 5202 / IEC 60115-1
General Specification
WF08P
0805 ( 2012 )
±1%, ±5%
0Ω, 1Ω ~ 10MΩ ( E96+E24 series)
Max. dissipation at T
amb
=70°C
Max. Operation Voltage (DC or RMS)
Climatic category (IEC 60068)
Basic specification
Note :
1.
2.
3.
0
Ω
0805,size maximum resistance Rmax < 25mΩ and rated current < 4Amp
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.
Dimensions:
Part No
L
W
Tt
Tb
t
WF08P
2.00
±
0.10
1.25
±
0.10
0.40
±
0.20
0.40
±
0.20
0.50
±
0.15
Marking
3-digits marking for 5% resistance
4-digits marking for 1% resistance
POE International Corp
SPECIFICATION OF HIGH POWER CHIP RESISTOR
M01-00-E-07
Ver: 1
Page:
4 of 7
FUNCTIONAL DESCRIPTION
Product characterization
Standard values of nominal resistance are taken from the E96 & E24 series for resistors with a tolerance of
±1%, ±5%.
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
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 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
POE International Corp
SPECIFICATION OF HIGH POWER CHIP RESISTOR
M01-00-E-07
Ver: 1
Page:
5 of 7
CATALOGUE NUMBERS
The resistors have a catalogue number starting with .
WF08
Size code
WF08
: 0805
P
Type code
P
: 1/4W
4702
Resistance code
E96 +E24:
3 significant digits followed by
no. of zeros
102Ω
37.4KΩ
220Ω
=1020
=3742
=2200
D
Tolerance
J :
±5%
F :
±1%
P : 0Ω
T
Packaging code
T
: 7” Reeled taping
_
Termination code
_ = SnPb base (“_”
means a blank)
L
=
Sn base (lead
free)
n
Reeled tape packaging
: 8mm width paper taping 5000pcs per 7” reel.
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