onsemi MMBD717LT1G Dual Series Switching Diode: Datasheet, Pinout, and Application Circuits

The onsemi MMBD717LT1G is a high-performance dual series switching diode encapsulated in a compact SOT-23 surface-mount package. This device integrates two independent diodes connected in a common-anode configuration, making it an excellent choice for space-constrained, high-speed switching applications. Its design is optimized for fast switching speeds, low forward voltage, and minimal leakage current, which are critical for modern electronic circuits.

Datasheet Overview

A review of the MMBD717LT1G datasheet reveals its key electrical characteristics and absolute maximum ratings. Each diode within the package boasts a repetitive peak reverse voltage (VRRM) of 100V and a continuous reverse voltage (VR) of 75V. The device features a forward voltage (VF) of just 1V at a forward current of 10mA, ensuring efficient operation with minimal power loss. With a reverse recovery time (trr) of only 4ns, it is exceptionally suited for high-frequency applications. The total power dissipation is 225mW, and it operates effectively over a junction temperature range from -55°C to +150°C.

Pinout Configuration

The pinout for the SOT-23 package is straightforward:

Pin 1 (Cathode 1): The cathode of the first diode.

Pin 2 (Common Anode): The shared anode connection for both diodes.

Pin 3 (Cathode 2): The cathode of the second diode.

This common-anode arrangement provides design flexibility, allowing the two diodes to be used separately or together in various circuit topologies.

Application Circuits

The MMBD717LT1G is versatile and finds use in numerous circuit functions:

1. High-Speed Switching: Its nanosecond-level reverse recovery time makes it ideal for use in high-frequency rectification and signal demodulation circuits.

2. Voltage Clamping and Protection: The diodes can be used to clamp voltage spikes and protect sensitive IC inputs from electrostatic discharge (ESD) and transient voltage events.

3. Logic Gates: In diode-logic circuits, the common-anode configuration can be utilized to create simple AND/OR gates.

4. Steering Diodes: It is perfectly suited for steering digital signals in communication interfaces and data routing applications.

A typical application circuit for voltage clamping involves connecting the cathode of one diode to a signal line and the common anode to a reference voltage (e.g., ground). Any positive voltage spike on the signal line exceeding the diode's forward voltage is then shunted to ground, protecting the downstream component.

ICGOODFIND Summary

The onsemi MMBD717LT1G is a highly reliable and efficient dual series switching diode. Its compact SOT-23 package, common-anode configuration, and excellent high-frequency performance make it a superior choice for designers working on space-saving PCBs in applications ranging from power management and signal conditioning to high-speed data protection. Its robust electrical ratings ensure reliability in demanding environments.

Keywords: Switching Diode, Common-Anode, SOT-23, High-Frequency Rectification, Voltage Clamping