## Technical Overview of the IRHN7250SE The **IRHN7250SE** is a high-reliability, Radiation Hardened (RadHard) N-Channel Power MOSFET. It is designed specifically for space applications, satellite systems, and extreme environments where radiation tolerance is a critical requirement. --- ### 1. Key Technical Specifications | Parameter | Value | | :--- | :--- | | **Drain-to-Source Voltage ($V_{DSS}$)** | 200 V | | **Continuous Drain Current ($I_D$)** | 26 A | | **Static Drain-to-Source On-Resistance ($R_{DS(on)}$)** | 0.100 $\Omega$ | | **Total Gate Charge ($Q_g$)** | 130 nC | | **Package Type** | SMD-0.5 (Surface Mount) | | **Radiation Rating (TID)** | 100 kRad(Si) | --- ### 2. Physical and Material Characteristics * **Hermetic Packaging:** The part is housed in a ceramic SMD-0.5 package. This hermetic seal protects the silicon die from moisture and atmospheric gases, which is vital for long-term reliability in a vacuum. * **Silicon Technology:** It utilizes International Rectifier's (now Infineon) proprietary Rad-Hard gate technology. * **Weight:** Extremely low mass (approx. 1.0g), making it ideal for weight-sensitive orbital payloads. --- ### 3. Radiation Performance The IRHN7250SE is built to withstand two major types of radiation interference: 1. **Total Ionizing Dose (TID):** Rated for 100 kRad. It maintains its electrical parameters within specified limits after exposure to cumulative radiation. 2. **Single Event Effects (SEE):** It is characterized for immunity against Single Event Burnout (SEB) and Single Event Gate Rupture (SEGR), ensuring the switch does not fail catastrophically when hit by heavy ions. --- ### 4. Typical Applications Due to its robust nature, this MOSFET is commonly found in: * **Satellite Power Systems:** Used in DC-DC converters and power distribution units (PDUs). * **Motor Control:** Actuators for solar array deployments or gimbal systems. * **Nuclear Instrumentation:** High-radiation terrestrial environments. * **Launch Vehicles:** Engine control and telemetry power stages. --- ### 5. Equivalent and Related Parts If you are looking for variations or testing equivalents: * **JANSR2N7482U2:** The MIL-PRF-19500 qualified version. * **IRHNA7250SE:** A similar die but often in different packaging (like the larger SMD-2).