KTR18
Resistors
Rev.F 1/3
High Volt age Resist ance Chip Resistors
KTR18 (1206 size: 1 / 4W)
zFeatu res
1) Power rating of 1 / 4W
2) Limiting elemen t voltage of KTR series is 2.5 times comp ared with that of MCR series.
3) Highly reliable chip re sistor Ruthenium oxide diel ectric of fers superior resistan ce to the element s.
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.
zRatings
0.25W (1 / 4W)
−55°C to +155°C
500V
at 70°C
Item Conditions Specifications
Rated power
Rated voltage
Operating temperature
Nominal resistance See Table 1.
Limiting element voltage
Power must be derated according to the power derating curve in
Figure 1 when ambient temperature exceeds 70°C.
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)
P: Rated power (W)
R: Nominal resistance (Ω)
E= P×R
0
20
40
60
80
100
−55 0 70 100 155
AMBIENT TEMPERATURE (°C)
POWER LOAD (%)
Fig.1
Table 1
Resistance tolerance Resistance range
(Ω)Resistance temperature coefficient
(ppm / °
C
)
F (±1%)
J (±5%) 1
≤
R
≤
10M
1
≤
R
≤
10M (E24)
(E24)
±100
±200
zBefore using components in circuits where they will be exposed to transients such as pulse loads (short–duration, high–level lo ads), 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.
KTR18
Resistors
Rev.F 2/3
zCharacteristics
Item Test conditions (JIS C 5201-1)
Resistor type
Guaranteed value
Resistance
Variation of resistance
with temperature
Solderability
Damp heat, steady state
Endurance at 70°C
Endurance
Rapid change of
temperature
Bend strength of
the end face plating
Resistance to solvent
Resistance to
soldering heat
Overload ± (2.0%+0.1Ω)
± (3.0%+0.1Ω)
J : ±5%
F : ±1%
± (1.0%+0.05Ω)
No remarkable abnormality on the appearance.
A new uniform coating of minimum of
95% of the surface being immersed
and no soldering damage.
JIS C 5201-1 4.5
JIS C 5201-1 4.8
Measurement : −55 / +25 / +125°C
JIS C 5201-1 4.18
Soldering condition : 260±5°C
Duration of immersion : 10±1s.
JIS C 5201-1 4.24
40°C, 93%RH
Test time : 1,000h to 1,048h
± (3.0%+0.1Ω)
± (3.0%+0.1Ω)
± (1.0%+0.05Ω)
± (1.0%+0.05Ω)
Without mechanical damage such as breaks.
± (1.0%+0.05Ω)
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 4.19
Test temp. : −55°C to +125°C 5cyc
JIS C 5201-1 4.33
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 4.13
Rated voltage (current) ×2.5, 2s.
Limiting Element Voltage×2 : 1000V
See Table.1
zDimensions (Unit : mm)
0.3±0.25
1.6±0.15 0.55±0.1
0.5±0.25
3.2±0.15
No. Material
Resistive element (Oxide metal thick film)
Silver thick film electrode
Nickel electrode
Sn electrode
Alumina substrate
Overcoating (Resin)
1
2
3
4
5
6
1
2
4
5
6
3
KTR18
Resistors
Rev.F 3/3
zPackaging
0 2
0 4
0 6
0 8
0 2
0 4
0 6
0 8
C
ABD
ABCD
P
0
P
2
P
1
E
FW
T
2
φD
0
A
2
B
2
Label EIAJ ET-7200B compliant
Thick paper
mount
(Underside paper tape)
Chip resistor Square punchout hole
Heat crimp cover/Tape
φ180 0
−1.5 φ60 +1
09 +1.0
0φ13±0.2
4.0±0.1 4.0±0.1 2.0±0.05 Max. 1.1
φ1.5 +0.1
0
8.0±0.3 3.5±0.05 1.75±0.1 1.95 +0.1
−0.05 3.5 +0.15
−0.05
(Unit: mm)
(Unit: mm)
WFEA
2
B
2
D
0
P
0
P
1
P
2
T
2
Reel Taping
zPart No. Explanation
Part No.
KT 81R
Resistance tolerance
F
J
Nominal resistance
EZP Paper tape (4mm Pitch) φ180mm (7in.) 5,000
E Z P J
KTR18
±1%
±5%
Packaging Specifications Code
Reel (φ180) : JEITA ET-7200B
: Standard product
Part No. Resistance tolerance
Code Packaging specifications Reel
Basic ordering unit(pcs)
J(±5%) F(±1%)
F
J:
:4 digits
3 digits
Resistance code, 3 or 4 digits.
Resistance
tolerance Resistance
code
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any
means without prior permission of ROHM CO.,LTD.
The contents described herein are subject to change without notice. The specifications for the
product described in this document are for reference only. Upon actual use, therefore, please request
that specifications to be separately delivered.
Application circuit diagrams and circuit constants contained herein are shown as examples of standard
use and operation. Please pay careful attention to the peripheral conditions when designing circuits
and deciding upon circuit constants in the set.
Any data, including, but not limited to application circuit diagrams information, described herein
are intended only as illustrations of such devices and not as the specifications for such devices. ROHM
CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any
third party's intellectual property rights or other proprietary rights, and further, assumes no liability of
whatsoever nature in the event of any such infringement, or arising from or connected with or related
to the use of such devices.
Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or
otherwise dispose of the same, no express or implied right or license to practice or commercially
exploit any intellectual property rights or other proprietary rights owned or controlled by
ROHM CO., LTD. is granted to any such buyer.
Products listed in this document are no antiradiation design.
Appendix1-Rev2.0
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More detail product informations and catalogs are available, please contact your nearest sales office.
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Copyright © 2008 ROHM CO.,LTD.
The products listed in this document are designed to be used with ordinary electronic equipment or devices
(such as audio visual equipment, office-automation equipment, communications devices, electrical
appliances and electronic toys).
Should you intend to use these products with equipment or devices which require an extremely high level
of reliability and the malfunction of which would directly endanger human life (such as medical
instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers
and other safety devices), please be sure to consult with our sales representative in advance.
It is our top priority to supply products with the utmost quality and reliability. However, there is always a chance
of failure due to unexpected factors. Therefore, please take into account the derating characteristics and allow
for sufficient safety features, such as extra margin, anti-flammability, and fail-safe measures when designing in
order to prevent possible accidents that may result in bodily harm or fire caused by component failure. ROHM
cannot be held responsible for any damages arising from the use of the products under conditions out of the
range of the specifications or due to non-compliance with the NOTES specified in this catalog.
21 Saiin Mizosaki-cho, Ukyo-ku, Kyoto 615-8585, Japan TEL : +81-75-311-2121
FAX : +81-75-315-0172
Appendix
