### ROHM LTR50

```High Power Chip Resistors
<Wide Terminal type>
LTR50 (5025 size : 1W)
 Features
1) Improved 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.
4) 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
Specifications
Power must be derated according to the power derating curve in
Figure 1 when ambient temperature exceeds 70°C.
1W
at 70°C
100
80
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
See Table 1.
Operating temperature
D(±0.5%) F(±1%) J(±5%)
Limiting element voltage
200V
−55°C to + 155°C
Table 1
Resistance tolerance
D (±0.5%)
F (±1%)
Resistance range
(Ω)
10 to 130k (E24)
1 to 1M (E24)
J (±5%)
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Resistance temperature coefficient
(ppm/°C)
±100
±100
±200
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2010.09 - Rev.F
LTR50
Data Sheet
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
Guaranteed value
Resistor type
Item
J : ±5%
F : ±1%
D : ±0.5%
Resistance
Variation of resistance
with temperature
Resistance to
soldering heat
JIS C 5201-1 4.5
JIS C 5201-1 4.8
Measurement : −55 / +25 / +125°C
See Table.1
JIS C 5201-1 4.13
Rated voltage (current) ×2.5, 2s.
± (2.0%+0.1Ω)
Solderability
Test conditions (JIS C 5201-1)
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.
Rapid change of
temperature
JIS C 5201-1 4.19
Test temp. : −55°C to +125°C 5cyc
± (3.0%+0.1Ω)
JIS C 5201-1 4.24
40°C, 93%RH
Test time : 1,000h to 1,048h
± (3.0%+0.1Ω)
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
± (3.0%+0.1Ω)
JIS C 5201-1 4.25.3
155°C
Test time : 1,000h to 1,048h
± (1.0%+0.05Ω)
JIS C 5201-1 4.29
23±5°C, Immersion cleaning, 5±0.5min.
Solvent : 2-propanol
Endurance at 70°C
Endurance
Resistance to solvent
± (1.0%+0.05Ω)
Without mechanical damage such as breaks.
Static electric
characteristics
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JIS C 5201-1 4.18
Soldering condition : 260±5°C
Duration of immersion : 10±1s.
± (1.0%+0.05Ω)
Bend strength of
the end face plating
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 4.33
EIAJ ED-4701/300 Test method 304
Voltage : 3kv
C : 100pF
R : 1.5kΩ
Apply cycle : 1 time
± (5.0%+0.05Ω)
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2010.09 - Rev.F
LTR50
Data Sheet
Dimensions (Unit : mm)
0.55±0.1
5.0±0.15
2.5±0.15
0.9±0.2
0.38±0.2
2.5±0.15
No.
Material
1
Resistive element
(Oxide metal thick film)
2
Silver thick film electrode
3
Nickel electrode
4
Sn electrode
5
Alumina substrate
6
Overcoating (Resin)
Packaging
Reel
Taping
P0
P2
B0
02
04
06
08
06
D
04
B
02
A
08
W
F
E
0
φD
A0
K
P1
(Unit : mm)
C
Label
W
F
E
A0
B0
12.0±0.3
5.5±0.05
1.75±0.1
3.4±0.2
5.6±0.2
EIAJ ET-7200B compliant
(Unit : mm)
A
B
C
D
D0
P0
P1
P2
K
0
φ180
−1.5
+1
φ60
0
+1.0
13
0
φ13±0.2
φ1.5 +0.1
0
4.0±0.1
4.0±0.1
2.0±0.05
Max. 1.1
Part designation
L T R 5 0
U Z P
J
Resistance tolerance
Part No.
D
F
J
±0.5%
±1%
±5%
Nominal resistance
Resistance code, 3 or 4 digits.
Resistance
tolerance
F,D
J
Resistance
code
:
:
4 digits
3 digits
Packaging Specifications Code
Part No.
Code
LTR50
UZP
Resistance tolerance
D(±0.5%) F(±1%)
J(±5%)
Packaging specifications
Embossed 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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2010.09 - Rev.F
Notice
Notes
No copying or reproduction of this document, in part or in whole, is permitted without the
consent of ROHM Co.,Ltd.
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
implicitly, any license to use or exercise intellectual property or other rights held by ROHM and
other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the
use of such technical information.
The Products specified in this document are intended to be used with general-use electronic
equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices).
The Products specified in this document are not designed to be radiation tolerant.
While ROHM always makes efforts to enhance the quality and reliability of its Products, a
Product may fail or malfunction for a variety of reasons.
Please be sure to implement in your equipment using the Products safety measures to guard
against the possibility of physical injury, fire or any other damage caused in the event of the
failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM
shall bear no responsibility whatsoever for your use of any Product outside of the prescribed
scope or not in accordance with the instruction manual.
The Products are not designed or manufactured to be used with any equipment, device or
system which requires an extremely high level of reliability the failure or malfunction of which
may result in a direct threat to human life or create a risk of human injury (such as a medical
instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuelcontroller or other safety device). ROHM shall bear no responsibility in any way for use of any
of the Products for the above special purposes. If a Product is intended to be used for any