The **1261-R2** is a specific electronic component most commonly associated with **VPT Inc.** (a HEICO company). It is a high-reliability, radiation-hardened (or radiation-tolerant) DC-DC converter accessory, specifically an **EMI Filter**. --- ## 1. Component Overview The 1261-R2 is part of the **DV Series** of filters. Its primary function is to reduce the conducted emissions of DC-DC converters to meet stringent military and aerospace standards. ### Key Specifications | Feature | Description | | :--- | :--- | | **Component Type** | EMI Filter (Passive) | | **Input Voltage** | Up to 50V DC (Continuous) | | **Output Current** | Up to 2.0 Amps | | **Standard Compliance** | MIL-STD-461 (C, D, E, F) | | **Operating Temp** | -55°C to +125°C | | **Package Style** | Hermetically sealed metallic case | --- ## 2. Technical Functions The 1261-R2 performs several critical tasks within a power system: 1. **Noise Suppression:** It filters high-frequency switching noise generated by DC-DC converters, preventing it from feeding back into the main power bus. 2. **Transient Protection:** It provides a level of protection against input voltage spikes and surges common in vehicle or aircraft electrical systems. 3. **Efficiency Preservation:** It is designed with low DC resistance (DCR) to ensure minimal power loss across the filter. --- ## 3. Application Areas Because of its "R2" designation (often implying specific screening or radiation tolerance levels in aerospace components), it is used in: * **Space Systems:** Low Earth Orbit (LEO) satellites. * **Military Avionics:** Radar, communication systems, and flight controls. * **Deep Sea Exploration:** High-reliability underwater power grids. --- ## 4. Typical Connection Diagram In a circuit, the 1261-R2 is placed between the primary power source and the DC-DC converter. ```mermaid graph LR A[Power Source] --> B[1261-R2 EMI Filter] B --> C[DC-DC Converter] C --> D[Sensitive Load/Electronics] ``` --- ## 5. Reliability Standards The "1261" series is typically manufactured in facilities certified to: * **MIL-PRF-38534:** Performance specification for hybrid microcircuits. * **ISO 9001:** Quality management systems.