The **MHR18TAJ-R** is a high-voltage, thick-film resistor manufactured by **Murata**. It belongs to the MHR series, which is specifically designed for high-voltage applications requiring stability and compact sizing. --- ### 1. Key Technical Specifications The following table highlights the primary electrical characteristics of the MHR18TAJ-R: | Parameter | Specification | | :--- | :--- | | **Resistance Value** | 100 MΩ (Standard for this series) | | **Tolerance** | ±5% (indicated by 'J' in the part number) | | **Max Operating Voltage** | 8.0 kV DC | | **Rated Power** | 0.5 Watts | | **Operating Temperature** | -40°C to +100°C | | **Temperature Coefficient** | ±500 ppm/°C | --- ### 2. Physical Construction and Features The "MHR" series utilizes **Thick Film technology** on a high-purity alumina substrate. * **Lead Type:** Radial leads (THT - Through Hole Technology). * **Coating:** Encapsulated in a flame-retardant epoxy resin (UL94V-0 compliant) to prevent arcing and provide moisture resistance. * **Stability:** Designed to maintain resistance stability even under high-stress electrostatic loads. * **Size:** Compact rectangular form factor to save PCB space compared to traditional cylindrical high-voltage resistors. --- ### 3. Part Number Breakdown Understanding the nomenclature helps identify variations: | Segment | Meaning | | :--- | :--- | | **MHR** | Murata High-Voltage Resistor Series | | **18** | Size/Style identifier | | **T** | Characteristics (Thick Film) | | **A** | Internal Code for specific design | | **J** | Resistance Tolerance (J = ±5%) | | **R** | Packaging Code (Radial Taping/Lead formation) | --- ### 4. Typical Applications Due to its high voltage rating (8kV), the MHR18TAJ-R is commonly found in: 1. **CRT Displays:** Used in focus and bleeder circuits. 2. **Copiers/Printers:** High-voltage power supplies for toner charging. 3. **Medical Equipment:** X-ray power supplies and imaging systems. 4. **Air Purifiers:** Ionizer circuits requiring high-voltage discharge. ---