The term **412-R** typically refers to a specific series or classification of electronic components, most commonly associated with **Surface Mount Device (SMD) resistors** or specific **electromechanical relays**. Below is a breakdown of the most common electronic parts identified by this designation. --- ### 1. 412 Series Relays (Teledyne Style) In high-end electronics and military applications, the "412" series is a famous line of **TO-5 Miniature Relays**. These are hermetically sealed, DPDT (Double Pole Double Throw) switches. | Feature | Specification | | :--- | :--- | | **Package Type** | TO-5 (Metal Can) | | **Contact Arrangement** | 2 Form C (DPDT) | | **Typical Voltage** | 5V, 12V, or 26.5V DC | | **The "R" Suffix** | Often denotes an internal **diode for coil suppression** (transient protection). | | **Applications** | Aerospace, Telecommunications, Test Equipment. | --- ### 2. 412-R SMD Resistor Marking In the context of resistor marking codes, "412R" represents a specific resistance value based on the standard numbering system. * **The Code:** `412R` * **The Value:** **412 Ohms** * **The Logic:** In this notation, the **"R"** acts as the decimal point (if placed between numbers) or simply indicates "Ohms" at the end. * *Example:* `4R7` = 4.7 $\Omega$ * *Example:* `412R` = 412 $\Omega$ --- ### 3. Precision Metal Film Resistors (412 Series) Some manufacturers (like Ohmite or Vishay) use "412" to denote a physical size or power rating for through-hole resistors. #### Typical Specifications: * **Wattage:** Usually 0.5W to 2W depending on the specific manufacturer series. * **Tolerance:** Often high precision (0.1% to 1%). * **Temperature Coefficient:** Low (e.g., 25ppm/°C to 50ppm/°C). --- ### Comparison of "412-R" Component Types | Component Type | Role | Key Characteristic | | :--- | :--- | :--- | | **Relay (412-R)** | Switching | Rugged, sub-miniature, contains suppression diode. | | **Resistor (412R)** | Current Limiting | Fixed resistance value of 412 Ohms. | | **Potentiometer (412)** | Tuning | Some legacy wirewound pots use 412 as a model number. | --- ### Summary Checklist for Identification If you are looking at a physical part labeled **412-R**, check the following: 1. **Shape:** If it is a small metal cylinder with 8 pins, it is a **Relay**. 2. **Color/Shape:** If it is a tiny black rectangle (SMD), it is a **412 Ohm Resistor**. 3. **Schematic Symbol:** Look for **K** (Relay) or **R** (Resistor) on the PCB silkscreen.