The **CD214B-R3200** is a Surface Mount (SMD) Fast Response Rectifier Diode, typically manufactured by Bourns. It is part of the R3xxx series, designed for rectification in power supplies, converters, and freewheeling diode applications. ### 1. Key Technical Specifications | Parameter | Value | Description | | :--- | :--- | :--- | | **Part Number** | CD214B-R3200 | Device Identifier | | **Max. Repetitive Peak Reverse Voltage ($V_{RRM}$)** | 200 V | Maximum voltage the diode can block in reverse. | | **Average Forward Current ($I_{F(AV)}$)** | 3.0 A | Maximum continuous current it can conduct. | | **Peak Forward Surge Current ($I_{FSM}$)** | 100 A | Maximum current for an 8.3ms single half-sine wave. | | **Forward Voltage Drop ($V_F$)** | 1.15 V (Max) | Voltage drop across the diode at 3.0A. | | **Reverse Recovery Time ($t_{rr}$)** | 500 ns | Time taken to stop conducting after polarity reversal. | | **Operating Temperature** | -55°C to +150°C | Thermal range for safe operation. | --- ### 2. Physical Characteristics The device uses the **SMB (DO-214AA)** package. This package is popular in automated assembly because of its low profile and reliable heat dissipation. * **Case Material:** Molded plastic (UL 94V-0 rated). * **Terminals:** Solderable per MIL-STD-750. * **Polarity:** The band denotes the **Cathode** end. --- ### 3. Application Use Cases Due to its 3A current rating and 200V peak reverse voltage, the CD214B-R3200 is commonly found in: 1. **Switching Power Supplies (SMPS):** Rectifying AC to DC or secondary side rectification. 2. **DC-DC Converters:** Used for voltage regulation and steering. 3. **Reverse Polarity Protection:** Protecting sensitive circuits if a battery or power supply is connected backwards. 4. **Freewheeling Diode:** Used in inductive loads (like motors or relays) to prevent voltage spikes when power is disconnected. --- ### 4. Circuit Diagram Symbol The standard schematic symbol for this component is a generic diode symbol: ```text Anode (A) Cathode (K) [+] ----|>|---- [-] ^ Direction of Current Flow ``` ---