High Power Chip Resistors
<Wide Terminal type>
LTR18 (3216 size : 1 / 2W)
Features
1) mproved welding strength
The structure of longer electrodes provides the wider welding area than the chip resistors with normal electrodes, and this
enhanced the solder welding strength.
2) Increased surge-resistance
This is achieved by Rohm’s original trimming technology plus resistive element patterning.
3) High-power tolerance
Two times of the rated power is guaranteed than the normal-electrode resistors.
ROHM resistors are ISO-9001 & ISO/TS16949 certified.
Applications
Automotive, industrial and power supply.
Ratings
Design and specifications are subject to change without notice.
Carefully check the specification sheet before using or ordering it.
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
POWER LOAD (%)
Specifications
0.5W (1 / 2W)
at 70°C
60
40
20
0
−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.
Limiting element voltage
200V
D(±0.5%) F(±1%) J(±5%)
−55°
C to
+ 155°C
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LTR18
Data Sheet
Table 1
Resistance tolerance
D (±0.5%)
F (±1%)
J (±5%)
Resistance range
(Ω)
Resistance temperature coefficient
(ppm/°C)
10 to 1M (E24)
1 to 1M (E24)
±100
±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.
Characteristics
Item
Guaranteed value
Resistor type
J :
±5%
F :
±1%
D :
±0.5%
See Table.1
±
(2.0%+0.1Ω)
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)
±
(3.0%+0.1Ω)
Damp heat, steady state
±
(3.0%+0.1Ω)
Endurance at 70°C
±
(3.0%+0.1Ω)
Endurance
±
(1.0%+0.05Ω)
Resistance to solvent
±
(1.0%+0.05Ω)
Without mechanical damage such as breaks.
Test conditions (JIS C 5201-1)
Resistance
Variation of resistance
with temperature
Overload
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.
Maximum overload voltage : 200V
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
Solderability
Resistance to
soldering heat
Rapid change of
temperature
Bend strength of
the end face plating
Static electric
characteristics
±
(5.0%+0.05Ω)
EIAJ ED-4701/300 Test method 304
Voltage : 3kv
C : 100pF
R : 1.5kΩ
Apply cycle : 1 time
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Notice
Notes
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The content specified herein is subject to change for improvement without notice.
The content specified herein is for the purpose of introducing ROHM's products (hereinafter
"Products"). If you wish to use any such Product, please be sure to refer to the specifications,
which can be obtained from ROHM upon request.
Examples of application circuits, circuit constants and any other information contained herein
illustrate the standard usage and operations of the Products. The peripheral conditions must
be taken into account when designing circuits for mass production.
Great care was taken in ensuring the accuracy of the information specified in this document.
However, should you incur any damage arising from any inaccuracy or misprint of such
information, ROHM shall bear no responsibility for such damage.
The technical information specified herein is intended only to show the typical functions of and
examples of application circuits for the Products. ROHM does not grant you, explicitly or
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The Products specified in this document are intended to be used with general-use electronic
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Please be sure to implement in your equipment using the Products safety measures to guard
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