Page 1 of 7 WFxxY Gold Termination Ver.16 April.-2010
WF12Y, WF08Y, WF06Y, WF04Y
±
±±
±1%, ±
±±
±5%
Gold Terminations of chip resistors
Size 1206, 0805, 0603, 0402
Customer :
Approval No :
Issue Date :
Customer Approval :
Page 2 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 3 of 7 WFxxY Gold Termination Ver.16 April.-2010
QUICK REFERENCE DATA
Item General Specification
Series No. WF12Y WF08Y WF06Y WF04Y
Size code 1206 (3216) 0805 (2012) 0603 (1608) 0402 (1005)
Resistance Tolerance ±1% (E96 series), ±5% (E24 series)
Resistance Range 1Ω ~ 10MΩ (±5% tolerance), 10Ω ~ 1MΩ (±1% tolerance)
TCR (ppm/°C)
≥10Ω ±5% Tolerance
≥10Ω ±1% Tolerance
<10Ω
≤ ± 200 ppm/°C
≤ ± 100 ppm/°C
-300~+500 ppm/°C
≤ ± 200ppm/°C
≤ ± 200ppm/°C
-300~+500 ppm/°C
Max. dissipation at T
amb
=70°C 1/4 W 1/8 W 1/10 W 1/16 W
Max. Operation Voltage (DC or RMS) 200V 150V 50V 50V
Max. Overload Voltage (DC or RMS) 400V 300V 100V 100V
Climatic category 55/155/56
Basic specification JIS C 5201-1 : 1998
Note :
1. This is the maximum voltage that may be continuously supplied to the resistor element, see “IEC publication
60115-8”
2. Max. Operation Voltage : So called RCWV (Rated Continuous Working Voltage) is determined by
ValueResistancePower RatedRCWV ×=
or Max. RCWV listed above, whichever is lower.
Dimensions
WF12Y WF08Y WF06Y WF04Y
L 3.10 ± 0.10 2.0 ± 0.10 1.60 ± 0.10 1.00 ± 0.05
W 1.60 ± 0.10 1.25 ± 0.10 0.80 ± 0.10 0.50 ± 0.05
T 0.60 ± 0.15 0.40 ± 0.20 0.45 ± 0.15 0.35 ± 0.05
Tb 0.45 ± 0.20 0.40 ± 0.20 0.30 ± 0.20 0.25 ± 0.10
Tt 0.50 ± 0.20 0.5 ± 0.15 0.30 ± 0.10 0.20 ± 0.10
Page 4 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 10Ω 12Ω 100Ω 6800Ω 47000Ω
3-digits marking 100 12R 101 682 473
4-digits marking 10R0 12R0 100R 6801 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 5 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 Y 472_ J T G
Size code
WF12Y: 1206
WF08 ; 0805
WF06 : 0603
WF04 : 0402
Type code
Y : E24/E96
resistance with
special
termination, ≥1%
Resistance code
E24 : 2 significant digits followed
by no. of zeros and a blank
4.7Ω =4R7_
10Ω =100_
220Ω =221_
Jumper =000_
(“_” means a blank)
E96 : 3 significant digits followed
by no. of zeros
102Ω =1020
37.4KΩ =3742
Tolerance
F : ±1%
J : ±5%
P : Jumper
Packaging code
T : 7” Reeled taping
B : Bulk
Termination code
G : Au termination
K : Ni termination
S : Ag termination
1. Reeled tape packaging : 8mm width paper taping 5000pcs per reel for WF12Y, WF08Y, WF06Y, 10000pcs per
reel for WF04Y.
2. Bulk packaging : 5000pcs per polybag
Page 6 of 7 WFxxY Gold Termination Ver.16 April.-2010
TEST AND REQUIREMENTS(JIS C 5201-1 : 1998)
REQUIREMENT
TEST PROCEDURE Resistor Jumper
DC resistance
Clause 4.5 DC resistance values measured at the test voltages specified below :
<10Ω@0.1V, <100Ω@0.3V, <1KΩ@1.0V,
<10KΩ@3V, <100KΩ@10V, <1MΩ@25V, <10MΩ@30V
Within the specified
tolerance < 50mΩ
Temperature
Coefficient of
Resistance(T.C.R)
Clause 4.8
Natural resistance change per change in degree centigrade.
( )
6
121
12 10×
−
−
ttR RR
(ppm/°C) t
1
: 20°C+5°C-1°C
R
1
: Resistance at reference temperature
R
2
: Resistance at test temperature
Refer to
“QUICK REFERENCE
DATA”
N/a
Short time overload
(S.T.O.L)
Clause 4.13
Permanent resistance change after a 5second application of a voltage
2.5 times RCWV (P
n
) or the maximum overload voltage specified in
the above list, whichever is less.
∆R/R max. ±(2%+0.10Ω) < 50mΩ
Resistance to
soldering heat(R.S.H)
Clause 4.18
Un-mounted chips completely immersed for 10±1second in a SAC
solder bath at 260℃±5ºC no visible damage
∆ R/R max.
±(0.5%+0.10Ω)
no visible
damage,
< 50mΩ
Solderability
Clause 4.17
Un-mounted chips completely immersed for 2±0.5 second in a SAC
solder bath at 235℃±5℃ good tinning (>95% covered) no visible
damage
Temperature cycling
Clause 4.19 30 minutes at -55°C±3°C, 2~3 minutes at 20°C+5°C-1°C, 30 minutes
at +155°C±3°C, 2~3 minutes at 20°C+5°C-1°C, total 5 continuous
cycles
no visible damage
∆R/R max. ±(1%+0.10Ω) no visible
damage,
< 50mΩ
Load life
(endurance)
Clause 4.25
1000+48/-0 hours; loaded with RCWV or V
max
in chamber controller
70±2ºC; 1.5 hours ON, 0.5 hours OFF ∆R/R max. (1.5%+0.1Ω) < 50mΩ
Load life in Humidity
Clause 4.24 1000 +48/-0 hours, loaded with RCWV or Vmax in humidity chamber
controller at 40°C±2°C and 90~95% relative humidity, 1.5hours on
and 0.5 hours off
10Ω~1MΩ
±(2%+0.1Ω)
<10Ω or ≥1MΩ
±(5%+0.1Ω)
< 50mΩ
Bending strength
Clause 4.33 Resistors mounted on a 90mm glass epoxy resin PCB(FR4);
bending : 3 mm, once for 10seconds no visible damage
∆R/R max. ±(1%+0.10Ω) no visible
damage,
< 50mΩ
Adhesion
Clause 4.32 Pressurizing force: 5N, Test time: 10±1sec. No remarkable damage or removal of the
terminations
Insulation Resistance
Clause 4.6 Apply the maximum overload voltage (DC) for 1minute R≧10GΩ
Dielectric Withstand
Voltage
Clause 4.7
Apply the maximum overload voltage (AC) for 1 minute No breakdown or flashover
Page 7 of 7 WFxxY Gold Termination Ver.16 April.-2010
PACKAGING
Paper Tape specifications (unit :mm)
Component Size W F E P0 ΦD
1206, 0805, 0603 and 0402 8.00±0.30 3.50±0.20 1.75±0.10 4.00±0.10
1.0 0.0
50.1
+
−
Φ
Component Size / Series A B P1 T
1206 ( 3216 ) 3.60±0.20 2.00±0.20 4.00±0.10 Max. 1.0
0805 ( 2012 ) 2.40±0.20 1.65±0.20 4.00±0.10 0.65±0.1
0603 ( 1608 ) 1.90±0.20 1.10±0.20 4.00±0.10 0.65±0.05
0402 ( 1005 ) 1.20±0.10 0.70±0.10 2.00±0.10 0.40±0.05
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 and Tape material
- Chip resistors 5,000 pcs/reel for WF12Y, WF08Y, WF06Y and 10,000pcs/reel for WF04Y.
- Paper tape.
