POE International Corp
SPECIFICATION OF POWER CHIP HIGH PRECISION RESISTOR
M01-00-E-07
Ver: 1
Page:
1 of 7
ROHS compliance
WF25H
±0.1%, ±0.5%
Power chip high precision resistors
Size 2512
Customer
:
Approval No :
Issue Date
:
Customer Approval :
POE International Corp
SPECIFICATION OF POWER CHIP HIGH PRECISION RESISTOR
M01-00-E-07
Ver: 1
Page:
2 of 7
FEATURE
1. High power rating and compact size
2. High reliability and stability
3. Reduced size of final equipment
4. High precision of resistance
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 (lead free) alloy.
Fig 1. Consctruction of Chip-R
POE International Corp
SPECIFICATION OF POWER CHIP HIGH PRECISION 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
≤
Rn < 9.76Ω
General Specification
WF25H
2512 ( 6432 )
±0.5%
;
±0.1%
(E24+E96)
1Ω ~ 10MΩ,
±
300 ppm/°C
±
200 ppm/°C
±
300 ppm/°C
1W
250V
500V
55/155/56
10Ω
≤
Rn < 1MΩ
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)
6.40±0.20
3.20±0.20
0.60±0.10
0.65±0.25
0.90±0.25
MASS
( per 100pcs ) : 4.25 gram
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
POE International Corp
SPECIFICATION OF POWER CHIP HIGH PRECISION 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
±0.5%
&
±0.1%.
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
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 POWER CHIP HIGH PRECISION RESISTOR
M01-00-E-07
Ver: 1
Page:
5 of 7
CATALOGUE NUMBERS
The resistors have a catalogue number starting with :
WF25
Size code
WF25 : 2512
H
Type code
H : High
precision
TC100
1000
Resistance code
E24+E96 : 3 significant digits followed
by no. of zeros
102Ω
37.4KΩ
=1020
=3742
B
Tolerance
B :
±0.1%
D :
±0.5%
T
Packaging code
T : 7” Reel taping
_
Termination code
_ = SnPb base (“_”
means a blank)
L
=
Sn base (lead
free)
TEST AND REQUIREMENTS
Essentially all tests are carried out according to the schedule of IEC publication 115-8, category
LCT/UCT/56
(rated
temperature range :
Lower Category Temperature, Upper Category Temperature;
damp heat, long term, 56 days). The
testing also meets the requirements specified by EIA, EIAJ and JIS.
The tests are carried out in accordance with IEC publication 68, "Recommended basic climatic and mechanical robustness
testing procedure for electronic components" and under standard atmospheric conditions according to IEC 60068-1,
subclause 5.3. Unless otherwise specified, the following value supplied :
Temperature: 15°C to 35°C.
Relative humidity: 45% to 75%.
Air pressure: 86kPa to 106 kPa (860 mbar to 1060 mbar).
All soldering tests are performed with midly activated flux.
TEST
DC resistance
PROCEDURE
REQUIREMENT
DC resistance values measured at the test voltages Within the specified tolerance
specified below :
<10Ω@0.1V,
<10KΩ@3V,
<10MΩ@30V
<100Ω@0.3V,
<100KΩ@10V,
<1KΩ@1.0V,
<1MΩ@25V,
Temperature
Coefficient of
Resistance
( TCR )
Natural resistance change per change in degree Test temperature
–55
~ +155°C
centigrade.
1Ω
≤
Rn < 9.76Ω,
±
300 ppm/°C
R
2
−
R
1
×
10
6
R
1
(
t
2
−
t
1
)
(ppm/°C)
10Ω
≤
Rn < 1MΩ,
±
200 ppm/°C
±
300 ppm/°C
1MΩ
≤
Rn < 10MΩ,
R
1
: Resistance at reference temperature
R
2
: Resistance at test temperature
t
1
: 25°C
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