A PTC thermistor is a type of electronic component whose resistance increases as the temperature rises. It is commonly used in applications such as temperature sensing, overcurrent protection, and limiting inrush current. Murata's POSISTOR® PTC thermistors are made from high-quality ceramic materials, ensuring excellent reliability and performance. The product line includes various package types, such as surface mount and leaded versions, and offers solutions for overcurrent protection, overheat protection, and surge current suppression. This article highlights three key characteristics of the POSISTOR® series. 1. Resistance-Temperature Characteristics Although there may be minor variations between normal operating temperatures and the Curie point, the POSISTOR® maintains a nearly constant resistance-temperature relationship. Its resistance increases sharply once the temperature exceeds the Curie point (CP). The CP is defined as the temperature at which the resistance doubles compared to its value at 25°C. This makes it ideal for temperature-sensitive applications where precise control is required. 2. Current-Voltage Characteristics (Static Characteristics) This characteristic describes the relationship between the applied voltage and the regulated current when the internal heat generated by the POSISTOR® balances with the external heat dissipation. The curve typically features a peak current point followed by a region of constant output power. This behavior allows the device to function effectively in both normal and overload conditions. 3. Current-Time Characteristics (Dynamic Characteristics) This refers to the relationship between current and time before the system reaches thermal equilibrium. Initially, the current is very high, but it rapidly decreases due to the rising resistance. This dynamic response is crucial for protecting circuits from sudden surges or overloads. Technical Terminology Protection Current The maximum current that can be safely handled by the POSISTOR® without triggering its protective mechanism is referred to as the "protection threshold current." When the current is below this level, the POSISTOR® behaves like a standard resistor, maintaining a stable operating point. However, if the current exceeds this threshold, the device transitions into a high-resistance state to protect the circuit. Protection Threshold Current Range The range of the protection threshold current depends on factors such as ambient temperature, resistance value, temperature coefficient, and physical design. Within the temperature range of -10°C to +60°C, the maximum trip current and minimum non-operating current are well defined. This ensures reliable operation under varying environmental conditions. Operating Time The operating time refers to the duration between the application of voltage and the subsequent drop in current. Traditionally, this is measured as the time it takes for the inrush current to decrease to half its initial value (I₀/2). This parameter is essential for understanding how quickly the POSISTOR® responds to transient events and stabilizes the circuit. 6Lan Software Router,6 Ethernet Mini Pc,6 Lan Mini Pc,6Lan Firewall Router Shenzhen Innovative Cloud Computer Co., Ltd. , https://www.xcypc.com
The three most important characteristics of PTC thermistors
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