The **US1ML-SMA-R** is a high-efficiency, surface-mount **Ultra Fast Recovery Rectifier Diode**. It is commonly used in power management circuits where high-speed switching and low power loss are critical. --- ### 1. Technical Specifications Below is a breakdown of the core electrical characteristics for the US1ML-SMA-R: | Parameter | Value | Description | |:---|:---|:---| | **Forward Current ($I_{F(AV)}$)** | 1.0 A | Maximum average rectified forward current. | | **Peak Reverse Voltage ($V_{RRM}$)** | 1000 V | Maximum repetitive peak reverse voltage. | | **Reverse Recovery Time ($t_{rr}$)** | 75 ns | Time taken to stop conducting in reverse. | | **Forward Voltage Drop ($V_F$)** | 1.7 V | Maximum voltage drop at rated current. | | **Operating Temperature** | -55 to +150 °C | Range of safe operational temperatures. | | **Package Type** | SMA (DO-214AC) | Standard surface-mount plastic package. | --- ### 2. Key Features * **Ultra-Fast Switching:** The 75ns recovery time makes it ideal for high-frequency applications, reducing switching losses significantly compared to standard diodes. * **Glass Passivated Junction:** The internal silicon die is protected by a glass layer, ensuring high reliability and stability over time. * **High Surge Capacity:** Capable of handling high non-repetitive peak surge currents (typically around 30A). * **RoHS Compliant:** Lead-free and environmentally friendly construction. --- ### 3. Pinout and Physical Construction The device uses the **SMA (DO-214AC)** package, which is a two-terminal surface-mount device. ```text _______ | | | [A]| | |[K] <-- Cathode (marked with a band) |___|___| ``` * **Anode (A):** The positive terminal. * **Cathode (K):** The negative terminal, identified by a **polarity band** printed on the plastic body. --- ### 4. Typical Applications The US1ML-SMA-R is versatile and found in the following circuits: 1. **Switching Power Supplies (SMPS):** Used for rectification in high-frequency AC/DC converters. 2. **Inverters:** For freewheeling and polarity protection. 3. **DC-DC Converters:** Acts as a catch diode or output rectifier. 4. **Freewheeling Diode:** Protects circuits from inductive spikes in motor controllers or relay drivers.