ROHM LTR18EZPF Technical data

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 Conditions Specifications

Rated power

Power must be derated according to the power derating curve in
Figure 1 when ambient temperature exceeds 70°

100

80

60

40

POWER LOAD (%)

20

0

−55 0 70 100 155
AMBIENT TEMPERATURE (°C)

Fig.1

C

.

0.5W (1 / 2W)
at 70°C

Rated voltage

Nominal resistance
Operating temperature

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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

See Table 1.

D(±0.5%) F(±1%) J(±5%)

P: Rated power (W)
R: Nominal resistance (Ω)

Limiting element voltage 200V

C to + 155°C

−55°

2010.06 - Rev.E

Table 1
R

t

n.

Data Sheet LTR18

esistance tolerance

D (±0.5%)
F (±1%)
J (±5%)

Resistance range

(Ω)

10 to 1M (E24)

1 to 1M (E24)

Resistance temperature coefficien

(ppm/°C)

±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

Resistance

Variation of resistance
with temperature

Overload

Solderability

Resistance to
soldering heat

Rapid change of
temperature

Damp heat, steady state

Endurance at 70°C

Endurance

Resistance to solvent

Bend strength of
the end face plating

Item Test conditions (JIS C 5201-1)

A new uniform coating of minimum of
95% of the surface being immersed
and no soldering damage.

No remarkable abnormality on the appearance.

Without mechanical damage such as breaks.

Guaranteed value

Resistor type

J : ±5%
F : ±1%
D : ±0.5%

See Table.1

± (2.0%+0.1Ω)

± (1.0%+0.05Ω)

± (1.0%+0.05Ω)

± (3.0%+0.1Ω)

± (3.0%+0.1Ω)

± (3.0%+0.1Ω)

± (1.0%+0.05Ω)

± (1.0%+0.05Ω)

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
Duration of immersion : 2.0±0.5s.

JIS C 5201-1 4.18
Soldering condition : 260±5
Duration of immersion : 10±1s.

JIS C 5201-1 4.19
Test temp. : −55

JIS C 5201-1 4.24

°C, 93%RH

40
Test time : 1,000h to 1,048h

JIS C 5201-1 4.25.1
Rated voltage (current), 70

1.5h : ON − 0.5h : OFF
Test time : 1,000h to 1,048h

JIS C 5201-1 4.25.3

°C

155
Test time : 1,000h to 1,048h

JIS C 5201-1 4.29
23±5

°C

, Immersion cleaning, 5±0.5mi

Solvent : 2-propanol
JIS C 5201-1 4.33

°C

to +125°C 5cyc

°C

°C

°C

EIAJ ED-4701/300 Test method 304

Voltage : 3kv
Static electric
characteristics

± (5.0%+0.05Ω)

C : 100pF

R : 1.5kΩ

Apply cycle : 1 time

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2010 ROHM Co., Ltd. All rights reserved.

2010.06 - Rev.E