SMD Diodes

SMD diodes are designed for surface-mount technology (SMT) and are soldered directly onto the PCB surface, while through-hole (normal) diodes have wire leads inserted into drilled holes and soldered on the underside. SMD diodes are smaller, lighter, and better suited for high-density PCB designs and automated manufacturing, whereas through-hole diodes are generally easier to handle manually and are often more robust for high-power applications.

Yes, an SMD diode can be tested with a multimeter using the diode test mode. Place the positive probe on the anode and the negative probe on the cathode — a functional diode will show a forward voltage drop (typically 0.4V–0.7V for silicon). Reversing the probes should show no continuity. Testing in-circuit may give inaccurate readings due to surrounding components; de-soldering the diode first is recommended for accurate results.

SMD diodes are identified by their compact package markings, which typically include a short alphanumeric code printed on the component body. A line or band on one end usually indicates the cathode. Cross-referencing the marking code with manufacturer datasheets or SMD codebooks helps determine the exact component type and specifications. Package types such as SOD-123, SOD-323, and SOD-523 are common identifiers for SMD diodes.

SMD diodes are available in a wide range of package types including SOD-123, SOD-323, SOD-523, SOT-23, DO-214AC (SMA), DO-214AA (SMB), and DO-214AB (SMC), among others. Level Solutions stocks all major package types across manufacturers such as Microchip Technology, Infineon, and NXP Semiconductors, covering both commercial and Mil-spec requirements.

Yes, Level Solutions offers both commercial and military-specification (Mil-Spec) SMD diodes from leading manufacturers including Microchip Technology, Infineon, and NXP Semiconductors. Mil-Spec components meet stringent reliability, temperature, and performance standards required for defense, aerospace, and mission-critical industrial applications. Contact our procurement team for specific Mil-Spec part numbers and availability.

SMD diodes are sensitive to electrostatic discharge (ESD). Level Solutions stores all components in an ESD-compliant warehouse using proper anti-static packaging and handling procedures. Upon shipment, components are packaged to prevent ESD damage and physical stress during transit. Millions of parts are available for same-day or next-day shipping, with policies available upon request.