The **HTS-3F-R** is a specific electronic component typically identified as a **High-Temperature, Surface-Mount (SMT) Thermal Switch** or a specific series of **Wire-to-Board Connectors**, depending on the manufacturer (most commonly associated with thermal protection or Hirose/JST style naming conventions). However, in the context of industrial electronics, the HTS series most frequently refers to **Bimetallic Thermal Protectors**. --- ### 1. Technical Specifications The "HTS" series generally defines a compact thermal protector designed to open or close a circuit when a specific temperature threshold is reached. | Feature | Specification (Typical) | | :--- | :--- | | **Action Type** | Normally Closed (NC) or Normally Open (NO) | | **Reset Type** | Automatic Reset | | **Contact Rating** | 1A - 3A (Low Voltage DC) | | **Operating Temp Range** | 40°C to 150°C (depending on specific model) | | **Mounting Style** | Surface Mount (SMD) / Reflow Solderable | | **Housing Material** | Heat-resistant PPS or Ceramic | ### 2. Key Internal Components The HTS-3F-R relies on several critical electronic and mechanical parts to function: * **Bimetallic Disc:** The heart of the part. It consists of two bonded metals with different thermal expansion coefficients. At a set temperature, the disc "snaps" to change the contact state. * **Stationary Contact:** A fixed conductive point, usually silver-plated or gold-plated to ensure low contact resistance. * **Movable Arm:** A spring-loaded conductive element that reacts to the bimetallic disc's movement. * **Terminal Leads:** The "R" in the suffix often denotes **RoHS compliance** or a specific **Reel packaging** for automated SMT pick-and-place machines. ### 3. Functional Application These parts are integrated into circuits to prevent catastrophic failure due to overheating. 1. **Over-temperature Protection:** Monitors power transistors, CPUs, or battery packs. 2. **Circuit Interruption:** If the component reaches the limit (e.g., 70°C), the HTS-3F-R opens the circuit, cutting power. 3. **Automatic Recovery:** Once the temperature drops below the "differential" threshold, the bimetal snaps back, re-closing the circuit. ### 4. Code Breakdown The nomenclature usually follows this logic: | Segment | Meaning | | :--- | :--- | | **HTS** | High Temperature / Thermal Switch Series | | **3** | Size Code (Physical dimensions, e.g., 3mm footprint) | | **F** | Function Type (often designates "Fixed" or "Fast" response) | | **R** | RoHS Compliant / Tape and Reel Packaging | ---