The code **0-Y-R** (specifically **0YR**) is a standard surface-mount device (SMD) marking used for high-precision resistors. This marking follows the **EIA-96 marking system**, which is used for 1% tolerance resistors to save space on small components (like 0603 packages). --- ## 1. Decoding "01Y" or "0-Y-R" In the EIA-96 system, the first two digits represent a **lookup value**, and the trailing letter represents the **multiplier**. ### Component Breakdown | Part | Meaning | Value | | :--- | :--- | :--- | | **01** (or 0) | Lookup Code | Represents the base value **100** | | **Y** | Multiplier | Represents **0.01** (or $10^{-2}$) | | **R** | Unit / Resistance | Standard notation for Ohms ($\Omega$) | ### The Calculation To find the actual resistance: 1. **Lookup:** The code `01` corresponds to the number `100` on the EIA-96 table. 2. **Multiplier:** The letter `Y` means you multiply the base value by `0.01`. 3. **Result:** $100 \times 0.01 = 1\Omega$. --- ## 2. Common Multiplier Codes If you see other letters following the numbers, they change the decimal place as follows: | Letter Code | Multiplier | | :--- | :--- | | **Z** | 0.001 | | **Y** | 0.01 | | **X** / **S** | 0.1 | | **A** | 1 | | **B** / **H** | 10 | | **C** | 100 | --- ## 3. Physical Characteristics These parts are typically found in modern electronics where space is at a premium. ### Specifications * **Package Size:** Usually 0603 (1.6mm x 0.8mm). * **Tolerance:** Typically **1%** (EIA-96 is reserved for precision parts). * **Mounting:** SMD (Surface Mount Device). ### Usage Note If the marking is **0R0**, it represents a **Zero-Ohm Link** (essentially a wire in a resistor's body used as a bridge on a PCB). However, **01Y** or **0-Y** specifically points to the $1\Omega$ precision value. ---