ROHM UCR03EWPJS User Guide
Summary
These high-performance fixed thick film chip resistors are engineered for sensitive current detection applications, providing superior power handling and ultra-low ohmic resistance ranging from 20mΩ to 910mΩ. This comprehensive manual details critical specifications, including extensive operating temperature ranges (-55°C to +155°C), detailed derating curves, rigorous testing standards (solderability/endurance), and precise dimensional data. It is essential reference material for electronics designers and engineers who require reliable, stable, low-resistance components in demanding circuit environments.
Page 1 Text Content
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°C. (0.02Ω R 0.2Ω)
0.2W (1 / 5W) (0.22Ω R 0.91Ω) at 70°C
AMBIENT TEMPERATURE (°C)
Fig.1
Rated voltage The voltage rating is calculated by the following equation.
E: Rated voltage (V)
I : Rated current (A) P: Rated power (W)
R: Nominal resistance (Ω)
Nominal resistance See Table 1.
Operating temperature −55°C to + 155°C
Table 1
Resistance temperature
Resistance tolerance Special specification Resistance range
coefficient (ppm/°C)
0.020 to 0.047 (E24) 0 to 250
0.051 to 0.091 (E24) 0 to 200
0.1 to 0.91(E24) 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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Page Summary Contents For ROHM UCR03EWPJS User Guide
Manual Details
| Brand | ROHM |
|---|---|
| Pages | 5 |
| File Size | 141.62 KB |
| Published | June 05, 2026 |
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Frequently Asked Questions
What safety precautions must I take when using this component with transient loads?
If exposed to transients, you must evaluate the component in the mounted state. Furthermore, performance cannot be guaranteed if used with a steady-state voltage greater than its rated voltage.
Is this resistor suitable for highly critical applications like aerospace or medical devices?
No. The products are not designed or manufactured for systems requiring extremely high reliability where failure might directly threaten human life or cause injury.
How do I calculate if the power rating needs to be adjusted based on ambient temperature?
If the ambient temperature exceeds 70°C, the power must be derated according to the specific power derating curve provided (Figure 1).