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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2010 ROHM Co., Ltd. All rights reserved.
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2010.06 - Rev.E
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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2010 ROHM Co., Ltd. All rights reserved.
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2010.06 - Rev.E
LTR18
Data Sheet
Dimensions
(Unit : mm)
3.2±0.15
0.55±0.1
No.
1
2
Material
Resistive element
(Oxide metal thick film)
Silver thick film electrode
Nickel electrode
Sn electrode
Alumina substrate
Overcoating (Resin)
1.6±0.15
1.6±0.15
3
4
5
6
Packaging
Reel
Taping
P
0
P
2
P
1
φD
0
E
F
B
0
08
06
04
02
02
04
06
08
0.3±0.2
0.5±0.2
W
A
B
D
A
0
Heat crimp cover/Tape
Thick paper (Underside paper tape) Chip resistor Square punchout hole
mount
T
2
C
Label
EIAJ ET-7200B compliant
(Unit: mm)
(Unit: mm)
A
φ180
0
−1.5
B
φ60
+1
0
9
C
+1.0
0
D
φ13±0.2
W
8.0±0.3
D
0
+0.1
φ1.5
0
F
3.5±0.05
P
0
4.0±0.1
E
1.75±0.1
P
1
4.0±0.1
A
0
+0.2
1.65
−0.1
P
2
2.0±0.05
B
0
2.4
+0.2
−0.1
T
2
Max. 1.1
Part
designation
L T R 1 8
Part No.
E Z P
D
F
J
J
Nominal resistance
Resistance code, 3 or 4 digits.
Resistance tolerance
±
0.5%
±
1%
±
5%
Resistance
tolerance
F,D
J
:
:
Resistance
code
4 digits
3 digits
Packaging Specifications Code
Part No.
LTR18
Code
EZP
Resistance tolerance
D(
±
0.5%) F(
±
1%)
J(
±
5%)
Packaging specifications
Paper tape (4mm Pitch)
Reel
φ180mm
(7inch)
Basic ordering unit
(pcs)
5,000
Reel (φ180mm) : Compatible with JEITA standard "EIAJ ET-7200B"
: Standard product
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2010 ROHM Co., Ltd. All rights reserved.
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2010.06 - Rev.E
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