• MM3Z18VT1G SC-76
MM3Z18VT1G SC-76


Diode Zener Single 18V 5% 300mW 2-Pin SOD-323 T/R


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Overview of MM3Z18VT1G

The MM3Z18VT1G is a Zener diode with a breakdown voltage of 18V and a power dissipation of 200mW. It is designed for voltage regulation and protection applications in various electronic circuits, providing a stable voltage reference and clamping capability.


(Note: The pin configuration below is a general representation. Refer to the specific datasheet for precise details.)

  • Anode: Positive terminal
  • Cathode: Negative terminal

Circuit Diagram

Include a circuit diagram showing the application of the MM3Z18VT1G Zener diode for voltage regulation and protection purposes.

Key Features

  • Breakdown Voltage: The MM3Z18VT1G has a breakdown voltage of 18V, providing stable voltage regulation.
  • Power Dissipation: With a power dissipation of 200mW, this Zener diode can handle moderate power levels.
  • Compact Form Factor: The MM3Z18VT1G comes in a small SOD-323 package, suitable for space-constrained applications.
  • Low Leakage Current: It features low leakage current, ensuring minimal power loss in standby or reverse bias conditions.
  • Reverse Voltage Protection: The Zener diode offers reverse voltage protection, safeguarding sensitive components in the circuit.

Note: For detailed technical specifications, refer to the MM3Z18VT1G datasheet.


  • Voltage Regulation: Ideal for providing stable voltage references in precision electronic circuits.
  • Overvoltage Protection: Used for clamping and protecting sensitive components from overvoltage conditions.
  • Signal Limiting: Suitable for limiting signal amplitudes in communication systems to prevent damage to receiving circuits.


The MM3Z18VT1G Zener diode maintains a constant voltage across its terminals when operated in the breakdown region, making it useful for voltage regulation and protection against excessive voltage spikes.

Usage Guide

  • Anode Connection: Connect the anode terminal to the positive side of the circuit.
  • Cathode Connection: Connect the cathode terminal to the negative side or ground of the circuit.
  • Voltage Regulation: Use the MM3Z18VT1G to regulate and stabilize voltages within the specified breakdown range.

Frequently Asked Questions

Q: What is the power dissipation rating of the MM3Z18VT1G?
A: The MM3Z18VT1G has a power dissipation of 200mW, allowing it to handle moderate power levels in circuit applications.

Q: Can the MM3Z18VT1G be used for overvoltage protection?
A: Yes, the MM3Z18VT1G can be employed for overvoltage protection by clamping voltages above its breakdown voltage, safeguarding connected components.


For similar functionalities, consider these alternatives to the MM3Z18VT1G:

  • BZX84C18: A Zener diode with a breakdown voltage of 18V and similar power dissipation capabilities for voltage regulation applications.
  • 1N4742A: This Zener diode also has a breakdown voltage of 18V and can be used for voltage reference and protection in electronic circuits.



The followings are basic parameters of the part selected concerning the characteristics of the part and categories it belongs to.

Product Status Active Voltage - Zener (Nom) (Vz) 18 V
Tolerance ±6% Power - Max 300 mW
Impedance (Max) (Zzt) 45 Ohms Current - Reverse Leakage @ Vr 50 nA @ 12.6 V
Voltage - Forward (Vf) (Max) @ If 900 mV @ 10 mA Operating Temperature -65°C ~ 150°C
Mounting Type Surface Mount Package / Case SC-76, SOD-323
Supplier Device Package SOD-323 Base Product Number MM3Z18

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