Low Ohmic Thick Film Chip Resistors
MCR18 (3216 size (1206 size) : 1 / 4W)
Features
1) Power rating of 1 / 4W
2) Highly reliable chip resistor Ruthenium oxide dielectric offers superior resistance to the elements.
3) Electrodes not corroded by soldering
Thick film makes the electrodes very strong.
4) ROHM resistors have approved ISO9001- / ISO/TS 19649- 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
60
40
20
0
Specifications
0.25W (1 / 4W)
at 70
°
C
POWER LOAD (%)
−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= P×R
E: Rated voltage (V)
P: Rated power (W)
R: Nominal resistance (Ω)
Limiting element voltage
1.51(9.1Ω)
Nominal resistance
Operating temperature
See Table 1.
−55
°
C
to
+155
°
C
Table 1
Resistance tolerance
F (±1%)
Special
specification
L
L
S
J (±5%)
L
L
S
Resistance range
(Ω)
Resistance temperature coefficient
(ppm/°C)
0.1 to 0.13
0.15 to 9.1
(E24)
(E24)
400±200
±250
500±300
400±200
±250
500±300
0.047 to 0.091 (E24)
0.1 to 0.13
0.15 to 0.91
(E24)
(E24)
0.047 to 0.091 (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.
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MCR18 (3216 size (1206 size) : 1 / 4W)
Characteristics
Item
Resistance
J :
±5%
F :
±1%
Guaranteed value
Resistor type
Test conditions (JIS C 5201-1)
JIS C 5201-1 4.5
Load voltage : A
Measuring method : measure upper termination
by 4 proves.
Upper termination
Prove
Data Sheet
Variation of resistance
with temperature
Overload
See Table.1
±
(2.0%+0.005Ω)
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)
±
(3.0%+0.005Ω)
JIS C 5201-1 4.8
Measurement :
+25
/
−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 : 56days
JIS C 5201-1 4.25.1
70°C, Rated voltage
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°C±5°C
Solvent : 2-propanol
JIS C 5201-1 4.33
Solderability
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
±
(0.5%+0.005Ω)
Component
solvent resistance
Bend strength of
the end face plating
Without open.
Dimensions
(Unit : mm)
1
0.5±0.25
2
No.
1
Material
Resistive element (Oxide metal thick film)
Silver thick film electrode
Nickel electrode
Sn electrode
Alumina substrate
Overcoating (Glass)
3
2
3
0.5±0.25
0.55±0.1
3.2±0.15
5
4
4
5
6
6
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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, 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
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