BZT52C18S-7-F_datasheet.eeworld.com.cn.pdf

### BZT52C18S-7-F Datasheet Knowledge Points #### Overview The BZT52C18S-7-F is a surface mount Zener diode manufactured by Diodes Incorporated. This component is part of the BZT52C2V0S-BZT52C39S series and is designed for applications requiring ultra-small surface mount packaging and high reliability. The diode features a planar die construction, making it ideal for automated assembly processes. It is lead-free and compliant with RoHS (Restriction of Hazardous Substances) regulations, ensuring environmental friendliness. #### Key Features - **Planar Die Construction:** Ensures low capacitance and stable performance over a wide temperature range. - **Ultra-Small Surface Mount Package:** Reduces the overall footprint on the PCB (Printed Circuit Board), making it suitable for compact designs. - **Automated Assembly Processes:** Optimized for use in high-speed SMT (Surface Mount Technology) assembly lines. - **Lead-Free and RoHS Compliant:** No purposefully added lead, meeting international environmental standards. - **Qualified to AEC-Q101 Standards:** Ensures high reliability, making it suitable for automotive applications. #### Maximum Ratings The maximum ratings define the limits under which the diode can operate without damage: - **Forward Voltage (VF):** 0.9V @ IF = 10mA. This indicates the voltage drop across the diode when it is conducting forward current. - **Power Dissipation (Pd):** 200mW. This is the maximum power that the diode can dissipate without overheating. - **Thermal Resistance (RθJA):** 625°C/W. This value represents the thermal resistance between the junction and the ambient air, indicating how well the diode can dissipate heat. - **Operating and Storage Temperature Range:** -65°C to +150°C. The diode can function within this temperature range without degradation or failure. #### Notes - **Part Mounted on FR-4 PCB:** The specified thermal resistance assumes the diode is mounted on an FR-4 PCB with the recommended pad layout. Refer to the manufacturer's website for detailed pad layout guidelines. - **Short Duration Test Pulse:** The forward voltage measurement uses a short test pulse to minimize self-heating effects, ensuring accurate measurement. - **No Purposefully Added Lead:** The diode does not contain any intentionally added lead, making it compliant with RoHS regulations. #### Mechanical Data The mechanical data provides dimensions and specifications for the package: - **Package Type:** SOD-323 - **Case Material:** Molded plastic with UL Flammability Classification Rating 94V-0. - **Moisture Sensitivity:** Level 1 per J-STD-020C, indicating low sensitivity to moisture during solder reflow. - **Terminals:** Solderable per MIL-STD-202 Method 208. - **Lead-Free Plating:** Matte tin finish annealed over Alloy 42 leadframe. - **Polarity:** Cathode band. - **Marking:** See datasheet page 2 for details. #### Dimensions The SOD-323 package dimensions are as follows (all dimensions in mm): - **A:** 2.30 to 2.70 - **B:** 1.60 to 1.80 - **C:** 1.20 to 1.40 - **D:** 1.05 typical - **E:** 0.25 to 0.35 - **G:** 0.20 to 0.40 - **H:** 0.10 to 0.15 - **J:** 0.05 typical #### Electrical Characteristics The electrical characteristics table provides detailed specifications for various models within the BZT52C2V0S-BZT52C39S series. Here is an excerpt focusing on the BZT52C18S-7-F model (assumed based on the file name): - **Type Number:** BZT52C18S-7-F - **Zener Voltage Range (VZ@IZT):** 1.8V ± 10% - **Maximum Zener Impedance (ZZT@IZT):** ≤100mΩ - **Maximum Reverse Current (IR):** 600µA @ VR - **Temperature Coefficient of Zener Voltage:** -3.5mV/°C These specifications indicate that the BZT52C18S-7-F is a 1.8V Zener diode with a maximum zener impedance of 100mΩ and a reverse current of 600µA at the specified reverse voltage. The negative temperature coefficient means that the Zener voltage will decrease slightly with increasing temperature. #### Conclusion The BZT52C18S-7-F is a robust and reliable surface mount Zener diode suitable for a variety of applications where space is limited and high reliability is required. Its lead-free construction, compliance with industry standards, and optimized thermal design make it an excellent choice for both commercial and automotive electronics.