The code **156-R** is a standard electronic marking typically used to represent a specific value for **Passive Components**, most commonly **Surface Mount (SMD) Resistors** or **Inductors**. Here is the technical breakdown of what this marking means and the parts associated with it. --- ### 1. Resistor Value Interpretation In the electronics industry, "R" acts as a decimal point when marked on SMD components. For a part labeled **156-R**: | Marking | Interpretation | Final Value | | :--- | :--- | :--- | | **15** | First two significant digits | 15 | | **6** | Third significant digit | 6 | | **R** | Decimal Point | . | | **Result** | **156.0** | **156 Ohms (Ω)** | *Note: If the 'R' is at the end (156R), it usually denotes 156 Ohms. If it is 15R6, it denotes 15.6 Ohms.* --- ### 2. Common Component Types Depending on the manufacturer, "156-R" refers to several distinct categories: #### A. SMD Resistors * **Package Sizes:** 0603, 0805, 1206. * **Tolerance:** Usually 1% or 5%. * **Function:** Limits current flow in a circuit. #### B. Power Inductors (Coils) Some manufacturers (like Eaton or Coiltronics) use "R" as a series suffix. * **Inductance:** If 156 refers to the value code ($15 \times 10^6$), it would be a very high value. However, in power inductors, "156" often refers to **15µH** (where 6 is a specific tolerance or series code). * **Usage:** DC-DC converters, voltage regulation, and noise filtering. #### C. Tantalum Capacitors In some legacy coding, "156" represents a capacitance value: * **15** = Base number. * **6** = Multiplier ($10^6$ pF). * **Value:** 15,000,000 pF = **15µF**. --- ### 3. Technical Specifications Table If you are looking for a replacement part, these are the standard parameters you must match: | Parameter | Common Range for 156-R | | :--- | :--- | | **Value** | 156 Ohms (Resistor) / 15µF (Capacitor) | | **Power Rating** | 1/10W to 1/4W (for SMD resistors) | | **Tolerance** | ±1%, ±5%, or ±10% | | **Material** | Thick Film (Resistors) / Manganese Dioxide (Capacitors) | | **Operating Temp** | -55°C to +155°C | --- ### How to identify the part physically: 1. **Black Body:** Almost certainly a **Resistor** (156 Ω). 2. **Grey/Silver/Wire-wound:** Likely an **Inductor**. 3. **Yellow/Orange/Black with a Polarity Bar:** A **Tantalum Capacitor** (15µF).