ROHM UCR18EVHJL User Guide
Summary
These low ohmic thick film chip resistors, ideal for precision current detection applications (11mΩ to 100mΩ), deliver superior power handling and stable performance in demanding circuits. The comprehensive manual details technical specifications, operational parameters across a wide temperature range (-55°C to +155°C), dimensional requirements, and stringent testing protocols (e.g., soldering, damp heat). Designed for electrical engineers and manufacturers, this component is perfect for reliability-critical electronic equipment, including audio visual, communication, and office automation devices requiring accurate current sensing.
Page 1 Text Content
Fixed Thick Film Low Ohmic Chip Resistors For Current Detection UCR18 (3216(1206) size : 1 / 2W)
Features 1) Chip resistors ideal for current detection. (11mΩ to 100mΩ) 2) Unique chip and terminal configuration reduces resistance shifting during the mounting process. 3) Superior rated power. 4) 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. at 70°C
AMBIENT TEMPERATURE (°C)
Fig.1
Rated voltage The voltage rating is calculated by the following equation.
E: Rated voltage (V)
E= P×R 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)
0.011 to 0.018 (E24) 0 to 350
0.020 to 0.039 (E24) F (±1%) 0 to 200
0.043 to 0.091 (E24) J (±5%) 0 to 150
0.1 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 UCR18EVHJL User Guide
Manual Details
| Brand | ROHM |
|---|---|
| Pages | 4 |
| File Size | 166.82 KB |
| Published | July 10, 2026 |
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Frequently Asked Questions
What is the functional purpose of these resistors?
They are designed for use as chip resistors ideal for precise current detection in circuits.
What is the acceptable operating temperature range?
The component has a nominal operating temperature range specified from -55°C to +155°C.
If I operate the device above 70°C, do I need to adjust power handling?
Yes, if the ambient temperature exceeds 70°C, the rated power must be derated according to Figure 1 in the data sheet.
Can these resistors handle high-level transients or pulse loads?
The resistance and performance cannot be guaranteed if used with steady state voltage greater than the rated voltage, especially for transient exposure. Evaluation of the component in the mounted state is advised.