The code **46-R** is most commonly associated with **Surface Mount Device (SMD)** components, particularly resistors and certain types of diodes or transistors. Because electronic marking codes can be ambiguous depending on the manufacturer, here is a breakdown of the two most likely parts this code represents. --- ### 1. High-Precision SMD Resistor (EIA-96 Marking) In the EIA-96 marking system used for 1% precision resistors, "46" is a lookup code for a specific resistance value, and "R" is the multiplier. | Component Part | Value/Meaning | | :--- | :--- | | **Code "46"** | Represents the significant digits **294** | | **Multiplier "R"** | Represents **0.01** | | **Calculated Value** | **2.94 Ohms (Ω)** | | **Tolerance** | Typically ±1% | **How to read it:** Using the EIA-96 table, the number `46` corresponds to `294`. The letter `R` acts as a multiplier of $10^{-2}$. Therefore, $294 \times 0.01 = 2.94 \Omega$. --- ### 2. General Purpose Transistor (Marking Code) If the component is a small 3-pin package (like an **SOT-23**), "46" often serves as a manufacturer's shorthand code. | Parameter | Details | | :--- | :--- | | **Part Number** | Often refers to **BFP460** or **BZT52** series (depending on brand) | | **Type** | NPN Silicon Germanium (SiGe) RF Transistor | | **Application** | Low noise amplifiers, wireless communication | | **Package** | SOT-343 or SOT-23 | --- ### 3. Indicator Lamps/LEDs In some industrial contexts, **46-R** refers to a specific type of T-2 slide base indicator lamp. * **Type:** Miniature Incandescent or LED. * **"R" suffix:** Usually indicates the color **Red**. * **Voltage:** Commonly 48V or 60V depending on the specific series. ### Summary Table | Context | Component Type | Physical Characteristics | | :--- | :--- | :--- | | **SMD Resistor** | 2.94 Ω Resistor | Rectangular chip, 0603 size | | **Semiconductor** | RF Transistor | 3 or 4-pin small plastic case | | **Lighting** | Indicator Lamp | Glass bulb with slide base | --- **Recommendation:** To identify the part with 100% certainty, check the **package shape** (is it a flat chip or a 3-legged component?) and the **PCB designator** (e.g., R46 for resistor, Q46 for transistor, or D46 for diode).