Fixed Thick Film Low Ohmic Chip Resistors For Current Detection
UCR03 (1608 size : 1 / 4W•1 / 5W)
Features
1) Superior rated power.
2) Stable, low resistance guaranteed regardless of the surrounding environment.
3) Thick film resistive elements were used to create this lineup of ultra-low resistance products ranging from 20m to 910m.
4) Chip resistors ideal for current detection.
5) 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 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
.
0.25W (1 / 4W)
< <
(0.02Ω R 0.2Ω)
0.2W (1 / 5W)
<
<
(0.22Ω R 0.91Ω)
at 70°C
Rated voltage
Nominal resistance
Operating temperature
Table 1
Resistance range
(Ω)
0.020 to 0.047 (E24)
0.051 to 0.091 (E24)
0.1 to 0.91(E24)
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.
The voltage rating is calculated by the following equation.
E= P×R
I = P R
See Table 1.
Resistance tolerance Special specification
J (±5%)
F (±1%)
E: Rated voltage (V)
I : Rated current (A)
P: Rated power (W)
R: Nominal resistance (Ω)
Resistance temperature
coefficient (ppm/°C)
S
L
0 to 250
0 to 200
0 to 150
C to + 155°C
−55°
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2011 ROHM Co., Ltd. All rights reserved.
2011.10 - Rev.B
UCR03
Data Sheet
Characteristics
Item Test conditions (JIS C 5201-1)
Resistance
Variation of resistance
with temperature
Overload
Solderability
Resistance to
soldering heat
Rapid change of
temperature
Guaranteed value
Resistor type
JIS C 5201-1 4.5
Measuring method : Measure under termination
F : ±1%
J : ±5%
See Table.1
±2.0%
A new uniform coating of minimum of
95% of the surface being immersed
and no soldering damage.
±1.0%
No remarkable abnormality on the appearance.
±1.0%
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
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
Under termination
°C
to +125°C 5cyc
Terminal
°C
°C
Damp heat, steady state
Endurance at 70°C
Endurance
Resistance to solvent
Bend strength of
the end face plating
±3.0%
±3.0%
±3.0%
±0.5%
Without open.
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
JIS C 5201-1 4.25.3
°C
155
Test time : 1,000h to 1,048h
JIS C 5201-1 4.29
°C
23±5
Immersion cleaning, 5±0.5min
Solvent : 2-propanol
JIS C 5201-1 4.33
°C
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2011 ROHM Co., Ltd. All rights reserved.
2011.10 - Rev.B
UCR03
Data Sheet
Dimensions (Unit : mm)
0.020Ω≦R＜0.050Ω
（上面）
（下面）
（断面図）
5
6
7
8
0.87±0.1
1.6±0.1
0.87±0.1
1.6±0.1
21
3
0.45±0.2
No. 材 料
1
2
3
4
5
6
7
8
0.5±0.1
4
アルミナ基板
銀系厚膜電極
抵抗体
オーバーコート
ニッケル／クロム皮膜電極
ニッケル皮膜電極
銅皮膜電極
錫皮膜電極
（上面）
（下面）
（断面図）
0.050Ω＜R≦0.91Ω
1.6±0.1
1.6±0.1
5
6
7
8
3
0.45±0.2
0.87±0.1
0.87±0.1
21
0.5±0.1
4
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2011 ROHM Co., Ltd. All rights reserved.
2011.10 - Rev.B
UCR03
Part No. Explanation
UC 0R 3 E W P J S
Data Sheet
Part No.
Resistance tolerance
F
±
1%
±
5%
J
Packaging Specifications Code
Part No.
UCR03
Reel (φ180mm) : Compatible with JEITA standard "EIAJ ET-7200B"
: Standard product
Resistance tolerance
Code Packaging specifications Reel
J(±5%) F(±1%)
EWP
EVP
Paper tape (4mm Pitch)
Paper tape (4mm Pitch)
Packaging
Reel Taping
ABD
0 2
0 4
0 6
0 8
C
ABCD
φ180
0
−1.5
φ60
+1
0
+1.0
9
0
Label
EIAJ ET-7200B compliant
(Unit: mm)
φ13±0.2
0 2
0 4
0 6
0 8
Special part number
0.020
to
S
L
0.091
0.1Ω to 0.91Ω
Nominal resistance
Ω
Resistance code, 3 or 4 digits.
Resistance
Basic ordering unit(pcs)
φ180mm (7in.)
φ180mm (7in.)
A
0
B
0
Top tape
Base paper
(Bottom tape)
WF EA0B
8.0±0.3 3.5±0.05 1.75±0.1
D
0
+0.1
4.0±0.1 4.0±0.05 2.0±0.05 Max. 1.1
φ1.5
0
5,000
5,000
P
0
P
2
P
1
Components
P
0
P
1
tolerance
Resistance
code
FL, FS, JSJL::4 digits
3 digits
Remarks
0.020
to
0.047
0.051
to
0.91
φD
0
F
Cavlty
(Unit: mm)
0
1.1±0.1 1.9±0.1
P
2
T
2
Ω
Ω
E
W
T
2
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2011 ROHM Co., Ltd. All rights reserved.
2011.10 - Rev.B
Notes
No copying or reproduction of this document, in part or in whole, is permitted without the
consent of ROHM Co.,Ltd.
The content specied herein is subject to change for improvement without notice.
The content specied 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 specications,
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 specied 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 specied 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 specied in this document are intended to be used with general-use electronic
equipment or devices (such as audio visual equipment, of ce-automation equipment, communication devices, electronic appliances and amusement devices).
The Products specied 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, re or any other damage caused in the event of the
failure of any Product, such as derating, redundancy, re 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
such special purpose, please contact a ROHM sales representative before purchasing.
If you intend to export or ship overseas any Product or technology specied herein that may
be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to
obtain a license or permit under the Law.
Notice
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R1120
A
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