The **252-R** typically refers to a high-voltage, stackable **silicon rectifier** or a specific type of **power resistor**, depending on the manufacturer (most commonly associated with brands like *Ohmite* for resistors or specific industrial diode manufacturers). Below is a breakdown of the two most common components associated with this part number. --- ### 1. 252-R Series Power Resistors (Ohmite Type) The most common "252" designation refers to the **Ohmite 250 Series** of power resistors. These are designed for high-current applications and heat dissipation. | Feature | Specification | | :--- | :--- | | **Component Type** | Vitreous Enamel Power Resistor | | **Mounting** | Radial Lug / Through-hole | | **Power Rating** | Typically 12W to 20W (for the 250 size) | | **Coating** | Flame-resistant Vitreous Enamel | | **Core Material** | Ceramic | **Key Characteristics:** * **Durability:** The enamel coating provides excellent protection against moisture and harsh environments. * **Overload Capacity:** Designed to handle significant surges without failing. * **Lead-Free:** Modern versions are usually RoHS compliant (often denoted by the "R" suffix or an additional "E"). --- ### 2. 252-R High Voltage Rectifiers In industrial electronics, "252-R" can also refer to **Rectifier Modules**, specifically those used in high-voltage power supplies or X-ray equipment. | Specification | Typical Value | | :--- | :--- | | **Function** | AC to DC Conversion (Rectification) | | **Max Peak Inverse Voltage (PIV)** | 2,000V - 10,000V (varies by sub-type) | | **Forward Current** | 250mA to 500mA | | **Construction** | Stacked Silicon Junctions | --- ### Technical Usage and Selection When replacing or selecting a 252-R component, you must verify the **Manufacturer** and the **Package Style** using the following checklist: 1. **Resistance Value (if Resistor):** Ensure the Ohmic value matches your circuit requirements. 2. **Voltage Rating:** For rectifiers, ensure the PIV (Peak Inverse Voltage) is at least 1.5x higher than your peak operating voltage. 3. **Tolerance:** Power resistors usually have a ±5% or ±10% tolerance. 4. **Heat Dissipation:** Ensure there is adequate airflow, as these parts are designed to get hot during operation. ---