The term **104-R** typically refers to a specific naming convention for passive electronic components, most commonly **Ceramic Capacitors** or **Inductors**. The "104" is a standard numerical code used to represent the value, while the "R" often denotes tolerance or a specific physical characteristic. --- ### 1. The 104-R Ceramic Capacitor In the context of capacitors, "104" is the value code, and "R" usually signifies compliance or a specific manufacturer series. #### Decoding the Value | Digit | Meaning | Value | | :--- | :--- | :--- | | **10** | Significant Figures | 10 | | **4** | Multiplier (number of zeros) | 10,000 | | **Total** | Value in Picofarads (pF) | 100,000 pF | | **Conversion** | Value in Microfarads (µF) | **0.1 µF** | #### Common Specifications * **Type:** Multilayer Ceramic Capacitor (MLCC) or Disc Ceramic. * **Application:** Used for decoupling (filtering noise) in digital circuits. * **The "R":** Often stands for **RoHS Compliant** (lead-free) or indicates a specific **Taping/Reel** packaging format. --- ### 2. The 104-R Power Inductor The designation **104R** is also a very common size/type for **Shielded Surface Mount (SMD) Power Inductors**. #### Technical Characteristics | Feature | Description | | :--- | :--- | | **Dimensions** | Roughly 10mm x 10mm x 4mm. | | **Shielding** | Magnetically shielded to prevent electromagnetic interference (EMI). | | **Value Code** | "104" here would represent **100 µH** (10 + four zeros in nH, or 100 µH). | | **Common Use** | DC-DC converters, power supplies for laptops, and LED drivers. | --- ### 3. Comparison Table | Component Type | Value | Primary Role | | :--- | :--- | :--- | | **Capacitor (104)** | 0.1 µF | Smoothing voltage ripples and noise filtering. | | **Inductor (104R)** | 100 µH | Storing energy in magnetic fields for power conversion. | --- ### Summary for Identification To determine which part you have: * **If it is a small yellow/orange disc or a tiny brown rectangle:** It is a **0.1µF Capacitor**. * **If it is a square black/grey block with a metal base:** It is a **100µH Power Inductor**.