The **CD214B-R31000** is a high-voltage, surface-mount glass passivated rectifier diode manufactured by Bourns. It is primarily used for power rectification, reverse battery protection, and voltage clamping in various electronic circuits. --- ### 1. Key Technical Specifications The following table highlights the critical electrical characteristics of the CD214B-R31000: | Parameter | Specification | | :--- | :--- | | **Part Number** | CD214B-R31000 | | **Package Type** | SMB (DO-214AA) | | **Continuous Forward Current ($I_F$)** | 3.0 Amperes | | **Repetitive Peak Reverse Voltage ($V_{RRM}$)** | 1000 Volts | | **Forward Voltage Drop ($V_F$)** | ~1.15 V @ 3A | | **Peak Forward Surge Current ($I_{FSM}$)** | 100 Amperes (8.3ms half sine-wave) | | **Operating Temperature Range** | -55°C to +150°C | --- ### 2. Physical Construction & Package - **Package Style:** It uses the **SMB (DO-214AA)** surface-mount package. This is a standard size, larger than SMA but smaller than SMC, providing a balance between power dissipation and PCB space. - **Construction:** It features a glass-passivated chip junction, which ensures high reliability and stability under high-temperature conditions. - **Compliance:** Lead-free, RoHS compliant, and Halogen-free. --- ### 3. Applications and Use Cases Because of its high voltage rating (1000V) and moderate current capacity (3A), it is commonly found in: * **AC-to-DC Rectification:** Converting high-voltage AC mains to DC in power supplies. * **Freewheeling Diode:** Protecting circuits from inductive spikes in motor controllers or relays. * **Reverse Polarity Protection:** Preventing damage if a battery or DC source is connected backward. * **Inverters:** Used in solar inverters and DC-DC converters. --- ### 4. Comparison with Similar Parts The CD214B series varies primarily by its voltage rating. Here is how the R31000 compares to others in the family: | Part Number | Peak Reverse Voltage ($V_{RRM}$) | Forward Current ($I_F$) | | :--- | :--- | :--- | | **CD214B-R3100** | 100 V | 3.0 A | | **CD214B-R3400** | 400 V | 3.0 A | | **CD214B-R31000** | **1000 V** | **3.0 A** |