ROHM MCR18EZHJS User's Manual and Specification Sheet
Summary
These high-reliability thick film chip resistors offer a 1/4W power rating and superior performance for demanding electronic circuits. The comprehensive manual provides engineers with detailed technical specifications, including operating ranges from -55°C to +155°C, critical data on rated voltage calculations, and rigorous testing standards covering solderability and thermal endurance. Ideal for designers seeking exceptionally reliable components that maintain stable performance even in harsh or high-stress environments.
Page 1 Text Content
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 Conditions Specifications
Rated power Power must be derated according to the power derating curve in
Figure 1 when ambient temperature exceeds 70°C. at 70°C
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)
Limiting element voltage 1.51(9.1Ω)
R: Nominal resistance (Ω)
Nominal resistance See Table 1.
Operating temperature −55°C to +155°C
Table 1
Special Resistance range Resistance temperature coefficient
Resistance tolerance
specification (Ω) (ppm/°C)
(±1%) 0.1 to 0.13 (E24) 400±200
0.15 to 9.1 (E24) ±250
0.047 to 0.091 (E24) 500±300 J (±5%) 0.1 to 0.13 (E24) 400±200
0.15 to 0.91 (E24) ±250 (E24) 500±3000.047 to 0.091
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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Page Summary Contents For ROHM MCR18EZHJS User's Manual and Specification Sheet
Manual Details
| Brand | ROHM |
|---|---|
| Pages | 4 |
| File Size | 126.95 KB |
| Published | July 10, 2026 |
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Frequently Asked Questions
How must I adjust the power when operating above 70°C?
The power must be derated according to the power derating curve provided in Figure 1.
What is the formula for calculating the rated voltage of the resistor?
Rated voltage (E) = P × R / Limiting element voltage, where P is Rated power and R is Nominal resistance.
Are these resistors suitable for applications requiring extreme reliability?
No, they are not designed or manufactured for equipment requiring an extremely high level of reliability that poses a direct threat to human life.
How do I properly handle transient loads like pulse loads?
You must evaluate the component in the mounted state before being used in circuits exposed to transients like pulse loads.
What are the physical dimensions and material composition of the component?
It has an alumina substrate, resistive oxide metal thick film element, silver thick film electrode, nickel electrode, and is coated with glass.