MMSZ5246BT1G - Datasheet, Price & PDF onsemi

MMSZ5246BT1G smd zener diode

The MMSZ5246BT1G is a popular small-sized Zener diode available in an SOD-123 package, making it ideal for compact PCB designs. It offers a stable reference voltage of 16V and can handle power dissipation up to 500mW, commonly used for voltage regulation, overvoltage protection, and general circuit protection. Its standout features include reliable performance, high stability, and a wide operating temperature range from -55°C to 150°C. Plus, it meets environmental standards, making it especially suitable for use in consumer electronics and automotive applications.

MMSZ5246BT1G breakdown voltage

The breakdown voltage (Zener voltage) of the MMSZ5246BT1G diode is typically 16 V, with a tolerance of approximately ±5%. This value indicates the voltage at which the diode begins to conduct in reverse, stabilizing the voltage across it.

MMSZ5246BT1G reverse leakage current

The reverse leakage current (reverse current, IR) of the MMSZ5246BT1G diode is typically very low, with a maximum of 100 nA measured at a reverse voltage of 12 V. This minimal leakage current ensures stable and efficient operation, particularly in voltage regulation and protection circuits.

MMSZ5246BT1G pinout

MMSZ5246BT1G equivalent zener diode

When selecting a replacement for the MMSZ5246BT1G, ensure that the substitute matches the original’s electrical characteristics and package type.

MMSZ5246BT1G voltage regulator circuit

This circuit is a simple transistor-Zener voltage regulator designed to maintain a stable output voltage despite variations in input voltage or load.

Circuit Analysis:

• Input Voltage (Vin):
  The input voltage is provided through a series resistor (RS​) to the Zener diode and the transistor base.

• Voltage Regulation Principle:
  The Zener diode keeps a constant reference voltage (VZ) across itself, stabilizing the transistor’s base voltage.

• Role of the Transistor:
  The transistor acts as an amplifier and voltage regulator. The constant voltage from the Zener diode at the transistor’s base ensures the transistor dynamically adjusts its conduction level, maintaining a stable output voltage, approximately equal to VZ​. Here, VBE​ is the base-emitter voltage drop, typically around 0.7 V.