The **B57504K0103A009** is a high-precision NTC (Negative Temperature Coefficient) thermistor manufactured by **TDK Electronics (formerly EPCOS)**. It is specifically designed for automotive and industrial temperature sensing applications where reliability and fast response times are critical. --- ### 1. Key Technical Specifications | Parameter | Value / Description | | :--- | :--- | | **Manufacturer** | TDK Electronics (EPCOS) | | **Resistance at 25°C** | 10 kΩ | | **Resistance Tolerance** | ±2% | | **B-Value (25/100)** | 3480 K ±1% | | **Operating Temperature** | -55°C to +150°C | | **Maximum Power** | 60 mW | | **Lead Material** | Silver-plated nickel wires | | **Housing/Enclosure** | Stainless steel probe / Nut housing | --- ### 2. Physical Design and Construction Unlike standard "bead" thermistors, the **K504** series is integrated into a specialized housing: * **Encapsulation:** The NTC element is glass-encapsulated, ensuring high stability and resistance to humidity. * **Mechanical Interface:** It features a stainless steel screw-on housing (typically an M4 or M5 stud), making it easy to mount onto heat sinks, engine blocks, or chassis. * **Robustness:** The design is optimized for environments with high vibration and thermal cycling. --- ### 3. Functional Characteristics * **NTC Behavior:** As the temperature increases, the electrical resistance of the component decreases. * **High Sensitivity:** Small changes in temperature result in large changes in resistance, allowing for accurate monitoring. * **Short Response Time:** Due to the efficient thermal coupling of the metal housing, the sensor reacts quickly to temperature fluctuations in the contact surface. --- ### 4. Common Applications 1. **Automotive:** Monitoring coolant temperature, engine oil, or HVAC systems. 2. **Industrial:** Heat sink temperature management in power electronics and motor drives. 3. **Renewable Energy:** Temperature control in solar inverters and battery storage systems. --- ### 5. Part Number Breakdown * **B57504**: Series designation for NTC sensors with screw-on housings. * **K**: High-stability version. * **0103**: Resistance code (10 + 3 zeros = 10,000 Ω or 10 kΩ). * **A009**: Specific design/tolerance revision.