Approval sheet
Page 1 of 8 ASC_WKxxV_V04 DEC - 2016
WK25V, WK20V, WK12V, WK08V, WK06V
±
±±
±5%, ±
±±
±2%, ±
±±
±1%, ±
±±
±0.5%
Thick Film High Voltage Chip Resistors
Size 2512, 2010,1206, 0805, 0603
*Contents in this sheet are subject to change without prior notice.
Approval sheet
Page 2 of 8 ASC_WKxxV_V04 DEC - 2016
FEATURE
1. Special material and design for high working voltage require.
2.
Compatible with flow and reflow soldering
3.
Suitable for lead free soldering.
4. High limiting voltage
APPLICATION
• Power supply
• Automotive industry
• Measurement instrument
• Back light inverter
•
Medical or 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 Tin (lead free) alloy.
Fig 1. Construction of Chip-R
Approval sheet
Page 3 of 8 ASC_WKxxV_V04 DEC - 2016
QUICK REFERENCE DATA
Item General Specification
Series No. WK25V WK 20V WK12V WK08V WK06V
Size code 2512(6432 ) 2010 ( 5025 ) 1206 ( 3216 ) 0805 ( 2012 ) 0603 (1608)
Resistance Tolerance
±0.5%, ±1%, ±2%, ±5%,
Resistance Range
±5%:
47Ω ~ 51MΩ
±1%, ±2%:
47Ω ~ 20MΩ
±0.5%:
47Ω ~ 10MΩ
±5%:
47Ω ~ 51MΩ
±0.5%, ±1%, ±2%:
47Ω ~ 10MΩ
47Ω ~10MΩ
TCR (ppm/°C)
+500~ -200
±200
±100
47Ω ~ 97.6Ω
100Ω ~ 549Ω
560Ω ~ 51MΩ
-
47Ω ~ 464Ω
470Ω ~ 51MΩ
-
47Ω ~ 97.6Ω
100Ω ~ 51MΩ
-
47Ω ~ 97.6Ω
100Ω ~ 51MΩ
-
47Ω ~ 464Ω
470Ω ~ 10MΩ
Max. Dissipation at
T
amb
=70°C 1 W 1/2 W 1/4 W 1/8 W 1/10W
Max. Operation Voltage
(DC or RMS) 800V 500V 500V 400V 200V
Max. Overload Voltage
(DC or RMS) 1600V 1000V 1000V 800V 400V
Climatic category (IEC
60068) 55/155/56
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.
MECHANICAL DATA (unit : mm)
Symbol
WK25V WK20V WK12V WK08V WK06V
L 6.30 ± 0.15
5.00 ± 0.15
3.20 ± 0.15
2.00 ± 0.10
1.60 ± 0.10
W 3.20 ± 0.15
2.50 ± 0.150
1.60 ± 0.15
1.25 ± 0.10
0.80 +0.15/-0.05
T 0.550 ± 0.15
0.55 ± 0.15
0.55 ± 0.10
0.55 ± 0.10
0.45 ± 0.10
Tt 0.60 ± 0.20
0.60 ± 0.20
0.50 ± 0.25
0.40 ± 0.20
0.30 ± 0.10
Tb 0.60 ± 0.20
0.60 ± 0.20
0.50 ± 0.25
0.40 ± 0.20
0.30 ± 0.10
1 0 5
Approval sheet
Page 4 of 8 ASC_WKxxV_V04 DEC - 2016
MARKING
For 5%, 1% E24 series, each resistor is marked with a three–digit code on the protective coating to designate
the nominal resistance value.
For 1% E96 series, each resistor is marked with a four–digit code on the protective coating to designate the
nominal resistance value.
For 1% E24/E96 overlapped values, each resistor is marked with three-digit code.
WK06V E96 has no marking!
Example:
105 = 1MΩ 1% , 5%, E24/E96
49R9 = 49.9Ω 1%, E96
123 = 12KΩ 1%, 5%, E24
FUNCTIONAL DESCRIPTION
Product characterization
Standard values of nominal resistance are taken from the E24/E96 series for resistors with a tolerance of
±1%, ±5%. 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
Figure 2
Maximum dissipation in percentage of rated power as a function of the
ambient temperature
MOUNTING
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.
Approval sheet
Page 5 of 8 ASC_WKxxV_V04 DEC - 2016
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
CATALOGUE NUMBERS
The resistors have a catalogue number starting with .
WK25 V 105 J T L
Size code
WK25 : 2512
WK20 : 2010
WK12 : 1206
WK08 : 0805
WK06 : 0603
Type code
V :High Voltage
Resistance code
5%, E24: 2 significant digits
followed by no. of zeros
100Ω = 101_
10KΩ = 103
1%, E24+E96: 3 significant
digits followed by no. of
zeros
100Ω =1000
37.4KΩ =3742
Tolerance
J : ±5%
G : ±2%
F : ±1%
D : ±0.5%
Packaging code
T : 7” inch reel
1206:paper tape, 5kpcs/reel
2010,2512 :plastic tape,
4kpcs/reel
Termination code
L = Sn base (lead
free)
Tape packaging WK12, WK08, WK06 : 8mm width paper taping 5,000pcs per reel.
WK25；WK20:
12mm width plastic taping 4,000pcs per reel.
Approval sheet
Page 6 of 8 ASC_WKxxV_V04 DEC - 2016
TEST AND REQUIREMENTS(JIS C 5201-1 : 1998)
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 PROCEDURE REQUIREMENT
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)
R
1
: Resistance at reference temperature
R
2
: Resistance at test temperature
t
1
: 20°C+5°C-1°C
Refer to
“QUICK REFERENCE DATA”
Short time overload
(S.T.O.L)
Clause 4.13
Permanent resistance change after a 2 second application of
a voltage 2.5 times RCWV or the maximum overload voltage
specified in the above list, whichever is less.
No visible damage
∆R/R max. ±(1%+0.05Ω)
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. ±(1%+0.05Ω)
Solderability
Clause 4.17
Un-mounted chips completely immersed for 2±0.5second 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%+0.05Ω)
Load life (endurance)
Clause 4.25 1000 +48/-0 hours, loaded with RCWV or Vmax
in chamber
controller 70±2ºC, 1.5 hours on and 0.5 hours off no visible damage
∆R/R max. ±(5%+0.1Ω)
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 95% relative humidity,
1.5hours on and 0.5 hours off
no visible damage
∆R/R max. ±(5%+0.1Ω)
Endurance at high
temperature
Clause 4.25.3
155
°C, no load, 1000hours
no visible damage
∆R/R max. ±(5%+0.1Ω)
Bending strength
Clause 4.33
Resistors mounted on a 90mm glass epoxy resin
PCB(FR4),
2512, 2010
bending : 1 mm
once for 10 seconds
1206, 0805, 0603 bending: 3mm
once for 10 seconds
∆R/R max. ±(1%+0.05Ω)
Adhesion
Clause 4.32 Pressurizing force: 5N, Test time: 10±1sec. No remarkable damage or
removal of the terminations
Approval sheet
Page 7 of 8 ASC_WKxxV_V04 DEC - 2016
TEST PROCEDURE REQUIREMENT
Insulation Resistance
Clause 4.6
Apply the maximum overload voltage (DC) for 1minute
R≧1GΩ
Dielectric Withstand
Voltage
Clause 4.7
Apply the maximum overload voltage (AC) for 1 minute
No breakdown or flashover
Approval sheet
Page 8 of 8 ASC_WKxxV_V04 DEC - 2016
PACKAGING
Tape specifications (unit :mm)
Series No. A B W F E
WK25V 6.90±0.20 3.60±0.20
WK20V 5.50±0.20 3.10±0.20 12.00±0.30 5.50±0.10 1.75±0.10
WK12V 3.60±0.20 2.00±0.15 8.00±0.30 3.50±0.20 1.75±0.10
WK08V 2.50±0.20 1.65±0.15 8.00±0.30 3.50±0.20 1.75±0.10
WK06V 1.90±0.20 1.15±0.15 8.00±0.30 3.50±0.20 1.75±0.10
Series No. P1 P0 ΦD T
WK25V
WK20V 1.1±0.15
WK12V
WK08V Max. 1.0
WK06V
4.00±0.10 4.00±0.10
1.0 0.0
50.1
+
−
Φ
Max. 0.8
Reel dimensions
(unit : mm)
Reel / Tape A B C D
7” reel for 12mm tape 13+1/0
7” reel for 8mm tape Φ180.0+0/-1.5 Φ60.0+1/0 13.0±0.2 9+1/0
