The term **-02-R2** is a common suffix used in the electronics industry to denote specific physical or electrical characteristics of a component. In most cases, it refers to a **1/10 Watt Resistor in a 0402 package size** or a specific revision of a Printed Circuit Board (PCB). Below is a detailed breakdown of how this code is interpreted across different electronic parts. --- ### 1. Resistor Specifications (SMD) In the context of Surface Mount Device (SMD) resistors, this suffix often relates to the **size** and **power rating**. | Component Part | Suffix Meaning | Description | | :--- | :--- | :--- | | **02** | Package Size | Represents the **0402** imperial size (1.0mm x 0.5mm). | | **R2** | Power Rating | Often denotes **1/10 Watt (0.1W)** or a specific resistance value (0.2 $\Omega$). | | **Material** | Thick Film | Usually indicates a standard thick film construction. | ### 2. Resistance Value Notation When "R2" is found within the value field of a part number, "R" acts as a decimal point. * **R20**: 0.20 Ohms ($\Omega$) * **2R0**: 2.0 Ohms ($\Omega$) * **R02**: 0.02 Ohms ($\Omega$) ### 3. PCB Revision and Assembly If the code appears at the end of a board part number (e.g., `MAIN-BD-02-R2`), it follows industrial versioning standards: * **02 (Major Version):** Indicates the second generation of the hardware design. This usually implies significant changes in circuitry or layout compared to version 01. * **R2 (Minor Revision):** Indicates the second "spin" or minor update of that specific version. This often involves "bug fixes" like moving a trace, changing a footprint, or updating a silkscreen label. --- ### 4. Common Manufacturer Examples Many large-scale manufacturers use this specific naming convention in their catalogs: | Manufacturer | Usage | Context | | :--- | :--- | :--- | | **Samsung/Yageo** | RC0402... | Used to signify the 0402 metric/imperial crossover. | | **TE Connectivity** | -02-R2 | Often used for specific wire-to-board connector variants. | | **Custom PCBA** | Rev-02-R2 | Standard for tracking engineering change orders (ECO). | --- ### Summary Checklist To identify your specific part exactly, check these three things: 1. **The Prefix:** Is it preceded by "RC" (Resistor), "CC" (Capacitor), or a custom brand string? 2. **Physical Size:** Use a caliper to see if it is 1.0mm x 0.5mm (0402 size). 3. **Schematic:** Look for the "R" designator on the PCB silk-screen to confirm it is a Resistor.