WF12Y, WF08Y, WF06Y, WF04Y
±
1%,
±
5%
Gold Terminations of chip resistors
Size 1206, 0805, 0603, 0402
Customer
:
Approval No :
Issue Date
:
Customer Approval :
Page 1 of 7
WFxxY Gold Termination
Ver.16
April.-2010
FEATURE
1. High reliability and stability
2. Reduced size of final equipment
3. Lower assembly costs
4. Higher component and equipment reliability
5. New Gold terminations provide special application for hybrid board gluing & can replace Pd/Ag terminations
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 Ni/Au.
Fig 1. Consctruction of a Chip-R
Page 2 of 7
WFxxY Gold Termination
Ver.16
April.-2010
QUICK REFERENCE DATA
Item
Series No.
Size code
Resistance Tolerance
Resistance Range
TCR (ppm/°C)
≥10Ω
±5%
Tolerance
≥10Ω
±1%
Tolerance
<10Ω
Max. dissipation at T
amb
=70°C
Max. Operation Voltage (DC or RMS)
Max. Overload Voltage (DC or RMS)
Climatic category
Basic specification
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
1/4 W
200V
400V
WF12Y
1206 (3216)
General Specification
WF08Y
0805 (2012)
WF06Y
0603 (1608)
WF04Y
0402 (1005)
±1%
(E96 series),
±5%
(E24 series)
1Ω ~ 10MΩ (±5% tolerance), 10Ω ~ 1MΩ (±1% tolerance)
≤ ±
200 ppm/°C
≤ ±
100 ppm/°C
-300~+500 ppm/°C
1/8 W
150V
300V
1/10 W
50V
100V
55/155/56
JIS C 5201-1 : 1998
≤ ±
200ppm/°C
≤ ±
200ppm/°C
-300~+500 ppm/°C
1/16 W
50V
100V
RCWV
=
Rated Power
×
Resistance Value
or Max. RCWV listed above, whichever is lower.
Dimensions
WF12Y
L
W
T
Tb
Tt
3.10
±
0.10
1.60
±
0.10
0.60
±
0.15
0.45
±
0.20
0.50
±
0.20
WF08Y
2.0
±
0.10
1.25
±
0.10
0.40
±
0.20
0.40
±
0.20
0.5
±
0.15
WF06Y
1.60
±
0.10
0.80
±
0.10
0.45
±
0.15
0.30
±
0.20
0.30
±
0.10
WF04Y
1.00
±
0.05
0.50
±
0.05
0.35
±
0.05
0.25
±
0.10
0.20
±
0.10
Page 3 of 7
WFxxY Gold Termination
Ver.16
April.-2010
Marking
3-digits marking（±5%
: 1206 & 0805 & 0603
）
Each resistor is marked with a three digits code on the protective coating to designate the nominal resistance
value. For values up to 9.1 the R is used as a decimal point. For values of 10.0 or greater the first 2 digits
apply to the resistance value and third indicate the number of zeros to follow.
4-digits marking（
±1%
: 1206/0805
）
Each resistor is marked with a four digits code on the protective coating to designate the nominal resistance value.
For values of <97.6Ω the R is used as a decimal point. For values of 100Ω or greater the first 3 digits are significant,
the fourth indicates the number of zeros to follow.
Example
RESISTANCE
3-digits marking
4-digits marking
10Ω
100
10R0
12Ω
12R
12R0
100Ω
101
100R
6800Ω
682
6801
47000Ω
473
4702
No marking for 0402 size.
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
Fig 2. Maximum dissipation in percentage of rated power
As a function of the ambient temperature
Page 4 of 7
WFxxY Gold Termination
Ver.16
April.-2010
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 means of special conductor glue. The end terminations guarantee a
reliable contact and the protective coating enables " face down " mounting.
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
235°C during 2 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 Resisto
rs
CATALOGUE NUMBERS
The resistors have a catalogue number starting with .
WF06
Size code
WF12Y: 1206
WF08 ; 0805
WF06 : 0603
WF04 : 0402
Y
Type code
Y : E24/E96
resistance with
special
termination,
≥1%
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%
P : Jumper
T
Packaging code
T : 7” Reeled taping
B : Bulk
G
Termination code
G : Au termination
K : Ni termination
S : Ag termination
(“_” means a blank)
E96 : 3 significant digits followed
by no. of zeros
102Ω
37.4KΩ
=1020
=3742
1.
2.
Reeled tape packaging : 8mm width paper taping 5000pcs per reel for WF12Y, WF08Y, WF06Y, 10000pcs per
reel for WF04Y.
Bulk packaging
: 5000pcs per polybag
Page 5 of 7
WFxxY Gold Termination
Ver.16
April.-2010
stm32/stm8
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