Fixed Thick Film Low Ohmic Chip Resistors For Current Detection
UCR18
(3216(1206) size : 1 / 2W)
Features
1) Chip resistors ideal for current detection. (11mΩ to 100mΩ)
2) Unique chip and terminal configuration reduces resistance shifting during the mounting process.
3) Superior rated power.
4) ROHM resistors have approved ISO9001- / ISO/TS 16949- certification
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.
E: Rated voltage (V)
E= P×R
P: Rated power (W)
R: Nominal resistance (Ω)
Nominal resistance
Operating temperature
See Table 1.
−55°
C to
+ 155°C
Table 1
Resistance range
(Ω)
Resistance tolerance
Special specification
Resistance temperature
coefficient (ppm/°C)
0.011 to 0.018 (E24)
0.020 to 0.039 (E24)
0.043 to 0.091 (E24)
0.1
F (±1%)
J (±5%)
L
S
0 to 350
0 to 200
0 to 150
0 to 150
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.
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UCR18
Characteristics
Item
Guaranteed value
Resistor type
Test conditions (JIS C 5201-1)
Data Sheet
JIS C 5201-1 4.5
Measuring method : Measure under termination
Resistance
F :
±1%
J :
±5%
Under termination
Terminal
Variation of resistance
with temperature
Overload
See Table.1
JIS C 5201-1 4.8
Measurement :
−55
/
+25
/
+125°C
JIS C 5201-1 4.13
Rated voltage (current)
×
2.5, 2s.
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 : 56 days
JIS C 5201-1 4.25.1
Rated voltage (current), 70°C
1.5h : ON
−
0.5h : OFF
Test time : 1,000h
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
Solvent : 2-propanol
JIS C 5201-1 4.33
±
(2.0%+0.005Ω)
Solderability
A new uniform coating of minimum of
95% of the surface being immersed
and no soldering damage.
±
(1.0%+0.005Ω)
No remarkable abnormality on the appearance.
±
(1.0%+0.005Ω)
Resistance to
soldering heat
Rapid change of
temperature
Damp heat, steady state
±
(3.0%+0.005Ω)
Endurance at 70°C
±
(3.0%+0.005Ω)
Endurance
±
(3.0%+0.005Ω)
Resistance to solvent
Bend strength of
the end face plating
±
(0.5%+0.005Ω)
Without open.
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Notice
Notes
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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, commu-
nication 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
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controller 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
such special purpose, please contact a ROHM sales representative before purchasing.
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