Based on your inquiry, the term **"222-R"** is most commonly associated with two specific types of electronic components: **Resistors** (using the EIA-96 marking system) and **Polyester Film Capacitors** (often called "222" or "222R"). Below is a breakdown of these parts. --- ## 1. The 222-R Resistor (SMD Code) In the context of Surface Mount Device (SMD) resistors, the code "222" represents the resistance value, while "R" can denote a decimal point or indicate compliance (like RoHS). ### Value Calculation | Digit | Meaning | Value | | :--- | :--- | :--- | | **First Digit (2)** | Significant Figure | 2 | | **Second Digit (2)** | Significant Figure | 2 | | **Third Digit (2)** | Multiplier ($10^2$) | 100 | | **Result** | **22 * 100** | **2,200 $\Omega$ (2.2k$\Omega$)** | ### Specifications * **Resistance:** 2.2 kOhms. * **Tolerance:** Typically ±5% (J) if using the 3-digit system. * **Common Packages:** 0603, 0805, 1206. --- ## 2. The 222-R Capacitor In capacitor marking, "222" refers to the capacitance in **Picofarads (pF)**. The "R" often appears in manufacturer series names (e.g., WIMA or KEMET) to signify specific spacing or lead types. ### Value Calculation * **Code:** 222 * **Formula:** $22 \times 10^2$ pF * **Total:** 2,200 pF or **2.2 nF** (0.0022 $\mu$F). ### Typical Applications * **Decoupling:** Filtering high-frequency noise. * **Timing Circuits:** Used in oscillators where a small, stable capacitance is needed. * **Coupling:** Blocking DC while allowing AC signals to pass. --- ## 3. Comparison Table | Feature | Resistor (222) | Capacitor (222) | | :--- | :--- | :--- | | **Primary Unit** | Ohms ($\Omega$) | Farads (pF) | | **Effective Value** | 2.2 k$\Omega$ | 2.2 nF | | **Physical Appearance** | Black rectangular chip (SMD) | Brown/Green/Red dipped or boxed | | **Function** | Limits current / Drops voltage | Stores charge / Filters signals | --- ### Summary Checklist If you are looking at a physical part: 1. **Is it a small black chip?** It is likely a **2.2k$\Omega$ resistor**. 2. **Is it a small "drop" or "box" shape?** It is likely a **2.2nF capacitor**. 3. **Is "222R" part of a relay or connector model?** Brands like *Wago* or *TE Connectivity* use similar numbering for specific terminal blocks or connectors (e.g., Wago 222 series).