KTR18
Resistors
Endured high voltage fixed thick film chip resistors
KTR18
(1206 size: 1 / 4W)
Features
1) Power rating of 1 / 4W
2) Limiting element voltage of KTR series is 2.5 times compared with that of MCR series.
3) Highly reliable chip resistor Ruthenium oxide dielectric offers superior resistance to the elements.
4) ROHM resistors have approved ISO–9001 certification.
Design and specifications are subject to change without notice. Carefully check the specification sheet before using or
ordering it.
Ratings
Item
Rated power
Conditions
Power must be derated according to the power derating curve in
Figure 1 when ambient temperature exceeds 70
°
C.
100
80
60
40
20
0
Specifications
0.25W (1 / 4W)
at 70
°
C
POWER LOAD (%)
−55
0
70
100
155
AMBIENT TEMPERATURE
(°C)
Fig.1
Rated voltage
The voltage rating is calculated by the following equation.
If the value obtained exceeds the limiting element voltage,
the voltage rating is equal to the maximum operating voltage.
E: Rated voltage (V)
E= P×R
P: Rated power (W)
R: Nominal resistance (Ω)
Nominal resistance
Operating temperature
See Table 1.
−55
°
C
to
+155
°
C
Limiting element voltage
500V
Table 1
Resistance tolerance
F (±1%)
J (±5%)
Resistance range
(Ω)
Resistance temperature coefficient
(ppm /
°C)
1
≤
R
≤
10M (E24)
1
≤
R
≤
10M (E24)
±100
±200
Before using components in circuits where they will be exposed to transients such as pulse loads (short–duration, high–level loads), be certain to evaluate the
component in the mounted state. In addition, the reliability and performance of this component cannot be guaranteed if it is used with a steady state voltage that
is greater than its rated voltage.
Rev.B
1/5
KTR18
Resistors
Characteristics
Item
Resistance
Variation of resistance
with temperature
Overload
Guaranteed value
Resistor type
J :
±5%
F :
±1%
See Table.1
Test conditions (JIS C 5201-1)
JIS C 5201-1 4.5
JIS C 5201-1 4.8
Measurement :
−55
/
+25
/
+125°C
JIS C 5201-1 4.13
Rated voltage (current)
×2.5,
2s.
Limiting Element Voltage×2 : 1000V
JIS C 5201-1 4.17
Rosin·Ethanol (25%WT)
Soldering condition : 235±5°C
Duration of immersion : 2.0±0.5s.
JIS C 5201-1 4.18
Soldering condition : 260±5°C
Duration of immersion : 10±1s.
JIS C 5201-1 4.19
Test temp. :
−55°C
to
+125°C
5cyc
JIS C 5201-1 4.24
40°C, 93%RH
Test time : 1,000h to 1,048h
JIS C 5201-1 4.25.1
Rated voltage (current), 70°C
1.5h : ON
−
0.5h : OFF
Test time : 1,000h to 1,048h
JIS C 5201-1 4.25.3
155°C
Test time : 1,000h to 1,048h
JIS C 5201-1 4.29
23±5°C, Immersion cleaning, 5±0.5min.
Solvent : 2-propanol
JIS C 5201-1 4.33
±
(2.0%+0.1Ω)
Solderability
A new uniform coating of minimum of
95% of the surface being immersed
and no soldering damage.
±
(1.0%+0.05Ω)
No remarkable abnormality on the appearance.
±
(1.0%+0.05Ω)
Resistance to
soldering heat
Rapid change of
temperature
Damp heat, steady state
±
(3.0%+0.1Ω)
Endurance at 70°C
±
(3.0%+0.1Ω)
Endurance
±
(3.0%+0.1Ω)
Resistance to solvent
±
(1.0%+0.05Ω)
±
(1.0%+0.05Ω)
Without mechanical damage such as breaks.
Bend strength of
the end face plating
External dimensions
(Unit : mm)
1
0.3±0.25
2
No.
1
Material
Thick film resistive element
Silver thick film electrode
Nickel electrode
Sn electrode
Alumina substrate
Overcoating
3
2
3
0.5±0.25
0.55±0.1
3.2±0.15
5
4
4
5
6
6
1.6±0.15
Rev.B
2/5
KTR18
Resistors
Packaging
Reel
Taping
P
0
P
2
P
2
φD
2
E
F
08
06
04
02
02
04
06
08
A
B
D
W
B
2
A
2
Heat crimp cover/Tape
Thick paper
mount
Label
EIAJ ET-7200B compliant
(Underside paper tape)
(Unit: mm)
Chip resistor Square punchout hole
T
2
C
(Unit: mm)
A
B
C
D
W
8.0±0.3
D
2
φ1.5
+0.1
0
F
3.5±0.05
P
2
4.0±0.1
E
1.75±0.1
P
2
4.0±0.1
A
2
1.95
+0.1
−0.05
3.5
B
2
+0.15
−0.05
T
2
Max. 1.1
φ180
0
−1.5
φ60
+1
0
9
+1.0
0
φ13±
0.2
P
2
2.0±0.05
Makeup of the part number
K T R 1 8
Part No.
E Z P
J
Nominal resistance
Resistance code, 3 or 4 digits.
Resistance tolerance
F
J
±
1%
±
5%
Resistance
tolerance
F
J
:
:
Resistance
code
3 digits
4 digits
Packaging Specifications Code
Part No.
KTR18
Code
EZP
Resistance tolerance
J(
±
5%)
F(
±
1%)
Packaging specifications
Paper tape (4mm Pitch)
Reel
φ180mm
(7in.)
Basic ordering unit(pcs)
5,000
Reel (
φ
180) : JEITA ET-7200B
: Standard product
Rev.B
3/5
KTR18
Resistors
Dimensions
3.40
3.35
3.30
JIS C 5201-1 4.4
SAMPLE SIZE : n=20pcs
MICROMETER
1.80
1.75
1.70
1.65
1.60
1.55
1.50
1.45
1
10
100
1k
10k 100k 1M 10M
0.75
JIS C 5201-1 4.4
SAMPLE SIZE : n=20pcs
MICROMETER
0.70
0.65
JIS C 5201-1 4.4
SAMPLE SIZE : n=20pcs
MICROMETER
THICKNESS
(mm)
1
10
100
1k
10k 100k 1M 10M
LENGTH
(mm)
WIDTH
(mm)
3.25
3.20
3.15
3.10
3.05
3.00
0.60
0.55
0.50
0.45
0.40
0.35
1
10
100
1k
10k 100k 1M 10M
1.40
RESISTANCE
(Ω)
RESISTANCE
(Ω)
RESISTANCE
(Ω)
Fig.2 Dimensions (length)
Fig.3 Dimensions (width)
Fig.4 Dimensions (thickness)
Electrical characteristics
TEMPERATURE COEFFICIENT (ppm/°C)
6.0
JIS C 5201-1 4.5
SAMPLE SIZE : n=20pcs
20°C 65%RH
DC RESISTANCE
(%)
6.0
JIS C 5201-1 4.5
SAMPLE SIZE : n=20pcs
20°C 65%RH
500
400
300
200
100
0
−100
−200
−300
−400
−500
10
100
4.0
DC RESISTANCE
(%)
4.0
2.0
0.0
−2.0
−4.0
−6.0
JIS C 5201-1 SEC 4.8
SAMPLE SIZE : n=10pcs
25°C /
−55°C
25°C / 125°C
2.0
0.0
−2.0
−4.0
−6.0
10
100
1k
10k
100k
1M
10M
10
100
1k
10k
100k
1M
10M
1k
10k 100k
1M
10M
RESISTANCE
(Ω)
RESISTANCE
(Ω)
RESISTANCE
(Ω)
Fig.5 Resistance (J class)
Fig.6 Resistance (F class)
Fig.7 Variation resistance with
temperature (J class)
TEMPERATURE COEFFICIENT (ppm/°C)
500
400
300
200
3.0
2.0
∆R/R
(%)
SOLDERD PERCENTAGE
(%)
JIS C 5201-1 SEC 4.8
SAMPLE SIZE : n=10pcs
25°C /
−55°C
25°C / 125°C
5.0
4.0
JIS C 5201-1 4.13
SAMPLE SIZE : n=10pcs
RATED VOLTAGE×2.5
TIMES : 2s
MAXIMUM OVERLOAD VOLTAGE : 800V
100
90
80
70
60
50
40
30
10
100
1k
10k 100k
1M
10M
100
0
−100
−200
−300
−400
−500
10
100
1k
10k 100k
1M
10M
1.0
0.0
−1.0
−2.0
−3.0
−4.0
−5.0
20
JIS C 5201-1 4.17
SAMPLE SIZE : n=10pcs
SOLDERING CONDITION : 235°C 2s
10
100
1k
10k
100k
1M
10M
RESISTANCE
(Ω)
RESISTANCE
(Ω)
RESISTANCE
(Ω)
Fig.8 Variation resistance with
temperature (F class)
Fig.9 Overload
Fig.10 Solderability
Rev.B
4/5
KTR18
Resistors
2.5
2.0
1.5
1.0
JIS C 5201-1 SEC 4.18
SAMPLE SIZE : n=10pcs
SOLDERING CONDITION : 260°C 10s
2.5
2.0
1.5
1.0
∆R/R
(%)
∆R/R
(%)
4.0
JIS C 5201-1 SEC 4.19
SAMPLE SIZE : n=10pcs
−55°C
/ 125°C 1000cyc
3.0
2.0
1.0
0.0
−1.0
−2.0
−3.0
JIS C 5201-1 SEC 4.24
SAMPLE SIZE : n=10pcs
40°C 93%RH WITH NO LOAD 1,000h
∆R/R
(%)
0.5
0.0
−0.5
−1.0
−1.5
−2.0
−2.5
10
100
1k
10k 100k 1M 10M
0.5
0.0
−0.5
−1.0
−1.5
−2.0
−2.5
10
100
1k
10k 100k 1M 10M
−4.0
10
100
1k
10k 100k 1M
10M
RESISTANCE
(Ω)
RESISTANCE
(Ω)
RESISTANCE
(Ω)
Fig.11 Resistance to soldering heat
Fig.12 Rapid change of temperature
Fig.13 Damp heat , Steady state
4.0
3.0
2.0
∆R/R
(%)
4.0
JIS C 5201-1 SEC 4.25.1
SAMPLE SIZE : n=10pcs
70°C 1,000h
THE RATED VOLTAGE 1.5h on, 0.5h off
2.0
JIS C 5201-1 SEC 4.25.3
SAMPLE SIZE : n=10pcs
155°C WITH NO LOAD 1,000h
1.5
1.0
∆R/R
(%)
3.0
2.0
∆R/R
(%)
JIS C 5201-1 SEC 4.29
SAMPLE SIZE : n=10pcs
IPA, 5min.
1.0
0.0
−1.0
−2.0
−3.0
−4.0
10
100
1k
10k 100k 1M
10M
1.0
0.0
−1.0
−2.0
−3.0
−4.0
1
10 100 1k 10k 100k 1M 10M
RESISTANCE
(Ω)
0.5
0.0
−0.5
−1.0
−1.5
−2.0
10
100
1k
10k 100k 1M
10M
RESISTANCE
(Ω)
RESISTANCE
(Ω)
Fig.14 Endurance (at70°C)
Fig.15 Endurance
Fig.16 Component solvent resistance
2.5
2.0
1.5
1.0
∆R/R
(%)
JIS C 5201-1 SEC 4.33
SAMPLE SIZE : n=10pcs
ENDURANCE WITH 90mm WIDTH
0.5
0.0
−0.5
−1.0
−1.5
−2.0
−2.5
10
100
1k
10k 100k 1M 10M
RESISTANCE
(Ω)
Fig.17 Bend strength of
the end face plating
Rev.B
5/5
