ROHM UCR03EWPJS Technical data
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
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