POE International Corp
M01-00-E-07
SPECIFICATION OF HIGH POWER CHIP RESISTOR
Ver: 1
Page: 1 of 7
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WF08P
±1%, ±5%, 0Ω
High Power Chip Resistors
Size 0805 1/4W
Customer :
Approval No :
Issue Date :
Customer Approval :
POE International Corp
M01-00-E-07
SPECIFICATION OF HIGH POWER CHIP RESISTOR
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
n High accuracy dc-power supply
n Digital multi-meter
n Telecommunication
n Computer
n Automotive industry
n 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
M01-00-E-07
SPECIFICATION OF HIGH POWER CHIP RESISTOR
Ver: 1
Page: 3 of 7
QUICK REFERENCE DATA
Item General Specification
Series No. WF08P
Size code 0805 ( 2012 )
Resistance Tolerance ±1%, ±5%
Resistance Range 0Ω, 1Ω ~ 10MΩ ( E96+E24 series)
TCR (ppm/°C) -55°C ~ +155°C
Ø 10 Ω
Ø <= 10 Ω
≤ ± 200 ppm/°C
- 300 ~ + 500 ppm/°C
Max. dissipation at Tamb=70°C 1/4 W
Max. Operation Voltage (DC or RMS)
150V
Climatic category (IEC 60068) 55/155/56
Basic specification JIS C 5202 / IEC 60115-1
Note :
1. 0Ω 0805,size maximum resistance Rmax < 25mΩ and rated current < 4Amp
2. This is the maximum voltage that may be continuously supplied to the resistor element, see “IEC publication
60115-8”
3. Max. Operation Voltage : So called RCWV (Rated Continuous Working Voltage) is determined by
ValueResistancePower RatedRCWV ×= or Max. RCWV listed above, whichever is lower.
Dimensions:
Part No
WF08P
L 2.00 ± 0.10
W 1.25 ± 0.10
Tt 0.40 ± 0.20
Tb 0.40 ± 0.20
t 0.50 ± 0.15
Marking
3-digits marking for 5% resistance
4-digits marking for 1% resistance
POE International Corp
M01-00-E-07
SPECIFICATION OF HIGH POWER CHIP RESISTOR
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
M01-00-E-07
SPECIFICATION OF HIGH POWER CHIP RESISTOR
Ver: 1
Page: 5 of 7
CATALOGUE NUMBERS
The resistors have a catalogue number starting with .
WF08 P 4702 D T _
Size code
WF08 : 0805
Type code
P : 1/4W
Resistance code
E96 +E24:
3 significant digits followed by
no. of zeros
102Ω =1020
37.4KΩ =3742
220Ω =2200
Tolerance
J : ±5%
F : ±1%
P : 0Ω
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.
POE International Corp
M01-00-E-07
SPECIFICATION OF HIGH POWER CHIP RESISTOR
Ver: 1
Page: 6 of 7
TEST AND REQUIREMENTS
Basic specification : JIS C 5201-1 : 1998
TEST PROCEDURE REQUIREMENT
clause 4.8
Temperature
Coefficient of
Resistance (TCR )
Natural resistance change per change in degree centigrade.
( )
6
121
12 10×
−
−
ttR RR (ppm/°C)
R1 : Resistance at reference temperature
R2 : Resistance at test temperature
t1 : 25°C
Test temperature –55~+155°C
>10Ω, ≤ ±200ppm/°C
≦10Ω, -300 ~ +500ppm/°C
clause 4.13
Short time overload
Permanent resistance change after a 5
second application of
5 times rated power or twice of the limiting element voltage,
whichever is less.
no visible damage
∆R/R max. ±(2.0%+0.1Ω)
clause 4.17
Solderability
Termination SnPb base : Unmounted chips completely
immersed for 2±0.5 sec. in a solder bath at 235±5ºC
Termination Sn base (lead free) : Unmounted chip
completely immersed in a lead free solder bath, 245°C±5°C,
3±1 sec
good tinning (>95% covered)
no visible damage
clause 4.18
Resistance to
soldering heat
After immersion into the flux, the immersion into solder shall
be carried out in solder bath at 5±1 seconds, 260±5ºC no visible damage
∆ R/R max. ±(1.0%+0.05Ω)
clause 4.19
Temperature cycling
1. 30 minutes at -55°C±3°C,
2. 2~3 minutes at room temperature,
3. 30 minutes at +125°±3°C,
4. 2~3 minutes at room temperature,
Total 5 continuous cycles
no visible damage
∆R/R max. ±(1.0%+0.05Ω)
clause 4.24
Load life in Humidity
1000 hours, at rated continuous working voltage in humidity
chamber controller at 40°C±2°C and 90~95% relative
humidity, 1.5hours on and 0.5 hours off
no visible damage
∆R/R max. ±(5%+0.1Ω)
clause 4.25.1
Load life (endurance)
70±2ºC, 1000 hours, loaded with RCWV or Vmax,1.5 hours
on and 0.5 hours off no visible damage
∆R/R max. ±(5%+0.1Ω)
clause 4.25.3
Endurance at the
upper category
temperature
125ºC, 1000 hours, no load. no visible damage
∆R/R max. ±(5%+0.1Ω)
clause 4.32
Bending and
Termination strength
Resistors mounted on a 90mm glass epoxy resin PCB(FR4);
bending : 3 mm, once for 10 seconds
Pulling test : 5N, 10 seconds
no visible damage
∆R/R max. ±(1.0%+0.05Ω)
POE International Corp
M01-00-E-07
SPECIFICATION OF HIGH POWER CHIP RESISTOR
Ver: 1
Page: 7 of 7
PACKAGING
Paper Tape specifications (unit :mm)
Series No. A B W F E
WF08P 2.40±0.20 1.65±0.20 8.00±0.30 3.50±0.20 1.75±0.10
Series No. P1 P0 ΦD T
WF08P 4.00±0.10 4.00±0.10 1.0 0.0
50.1 +
−
Φ Max. 1.0
Reel dimensions
Symbol A B C D
(unit : mm) Φ178.0±2.0 Φ60.0±1.0 13.0±0.2 9.0±0.5
Taping quantity
- Chip resistors 5,000 pcs/reel
Production location in PDC- Tau Yuan within WTC Gro
