Diodes
Products (2)
LDH40 - High-Speed Switching Diode | Vishay
The LDH40 is a high-speed switching diode manufactured by Vishay, designed for general-purpose switching and signal processing applications. It features a maximum repetitive peak reverse voltage of 80 V and a forward continuous current of 300 mA, making it suitable for low-power switching circuits. The device is available in a DO-35 glass axial-lead package, which is widely used in through-hole PCB designs. A switching diode is a semiconductor device that allows current to flow in one direction while blocking it in the reverse direction, with fast recovery characteristics optimized for high-frequency switching. In the hierarchy of electronic components, a switching diode falls under discrete semiconductors, specifically within the diode family, which also includes rectifiers, Zener diodes, and Schottky diodes. Switching diodes are essential in applications such as signal clamping, voltage limiting, and logic gating, where rapid transitions between conducting and non-conducting states are required. Key features of the LDH40 include a fast reverse recovery time of 4 ns, which minimizes switching losses in high-frequency circuits, and a low forward voltage drop of 1 V at 100 mA, ensuring efficient operation. The device also offers a high reverse breakdown voltage of 80 V, providing adequate margin for typical signal-level voltages. Its DO-35 package is compact and robust, with a power dissipation rating of 500 mW, suitable for low-power applications. Technically, the LDH40 is fabricated using planar epitaxial technology, which ensures consistent electrical characteristics and high reliability. The device's fast recovery time is achieved through gold doping, which reduces carrier lifetime and accelerates the transition from forward conduction to reverse blocking. This makes the LDH40 particularly effective in high-frequency switching circuits, such as those found in communication equipment and instrumentation. Typical applications include signal clamping in analog circuits, voltage limiting in protection circuits, and switching in logic gates. The LDH40 is also used in RF detectors and mixers, where its fast recovery and low capacitance are advantageous. In audio equipment, it can be used for signal rectification and envelope detection. When designing with the LDH40, ensure that the reverse voltage does not exceed the 80 V rating and that the forward current remains within the 300 mA limit. For high-frequency operation, keep lead lengths short to minimize parasitic inductance. The device is RoHS compliant and lead-free, making it suitable for environmentally conscious designs.
STTH102AY - 1A 200V Ultrafast Rectifier | STMicroelectronics | SMA
The STTH102AY is an ultrafast high-voltage rectifier diode from STMicroelectronics, designed for high-frequency power conversion applications. It delivers a forward current of 1A with a repetitive peak reverse voltage of 200V, housed in a compact SMA (DO-214AC) surface-mount package. The device features an ultrafast reverse recovery time of 25 ns, making it ideal for switching power supplies, freewheeling diodes, and snubber circuits. A rectifier diode is a semiconductor device that allows current to flow in only one direction, converting alternating current (AC) to direct current (DC). Ultrafast rectifiers are a subclass of power diodes optimized for high-speed switching, with reverse recovery times typically below 50 ns. They are essential in switch-mode power supplies (SMPS) and DC-DC converters where efficiency and reduced switching losses are critical. The STTH102AY belongs to the STTH family of ultrafast diodes, which are known for their low forward voltage drop and fast recovery characteristics. Key features of the STTH102AY include a low forward voltage drop of 0.85V at 1A, a maximum junction temperature of 175°C, and a repetitive peak reverse voltage of 200V. The device also offers a non-repetitive peak forward surge current of 30A, ensuring robustness during transient conditions. Its SMA package provides excellent thermal performance with a thermal resistance of 15°C/W, enabling efficient heat dissipation in compact designs. The STTH102AY utilizes planar technology, which ensures stable and reliable performance across its operating range. The ultrafast recovery time minimizes reverse recovery losses, improving overall system efficiency in high-frequency circuits. The device is AEC-Q101 qualified, making it suitable for automotive applications where reliability under harsh conditions is paramount. Typical applications include switch-mode power supplies, freewheeling diodes in inductive loads, snubber circuits, and output rectification in DC-DC converters. Its fast recovery and low forward voltage make it particularly effective in power factor correction (PFC) circuits and LED lighting drivers. When designing with the STTH102AY, ensure adequate PCB copper area for thermal management, especially at high forward currents. The device's fast recovery characteristics require careful layout to minimize parasitic inductance, which can cause voltage spikes during switching transitions.