The part number **JH30240400DCNUNNTHCWC** refers to a high-performance **Thin Film Power Resistor**, typically manufactured by specialized electronic component firms like **Ohmite** or **Vishay** (often within the Arcol or MC Series). These components are designed for high power density and precision in demanding environments. --- ### 1. Technical Specifications Below is a breakdown of the standard technical parameters associated with this class of electronic component: | Feature | Specification | | :--- | :--- | | **Component Type** | Thin Film Power Resistor | | **Resistance Value** | 400 Ohms (derived from '400') | | **Power Rating** | 30 Watts (at specific heat sink temperatures) | | **Tolerance** | ±0.5% to ±5% (Series dependent) | | **Package Type** | D-PAK (TO-252) or SOT-227 (depending on prefix) | | **Temperature Coefficient** | Low TCR (typically ±50ppm/°C or ±100ppm/°C) | --- ### 2. Part Number Breakdown (Deciphering the Code) While manufacturers have unique internal coding, the "JH" series generally follows this logic: * **JH30:** Indicates the **Series** and **Power Rating** (30 Watts). * **240400:** Refers to physical dimensions or a specific resistance coding (often 400 Ohms). * **DC:** Often signifies the **Tolerance** or **Temperature Coefficient**. * **NUNNTHCWC:** These suffixes usually represent **Packaging** (Tape & Reel vs. Tube), **Lead-free/RoHS status**, and specific **Terminal Finishes**. --- ### 3. Key Electronic Characteristics * **Heat Dissipation:** These parts are "chassis-mounted" or "heat-sinkable." Without a proper thermal interface, the power rating drops significantly. * **Inductance:** Being Thin Film, these resistors have **Very Low Inductance**, making them ideal for high-frequency applications and fast-switching power circuits. * **Stability:** Designed to maintain resistance accuracy under high thermal stress. --- ### 4. Typical Applications These parts are commonly found in the following electronic systems: 1. **Power Supplies:** Used as snubbers or discharge resistors. 2. **Motor Control:** Current sensing and braking circuits. 3. **Medical Equipment:** High-precision power regulation. 4. **RF Systems:** Dummy loads or termination resistors due to low inductance. ---