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Zener diode with 3.9V breakdown voltage, 5% tolerance, 10W power rating, silicon construction, unidirectional current flow, and DO-4 package

Quantity Unit Price(USD) Ext. Price
1 $47.082 $47.08
200 $18.219 $3,643.80
500 $17.580 $8,790.00
1000 $17.263 $17,263.00


*The price is for reference only.
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Overview of 1N3993A

The 1N3993A is a Zener diode designed for voltage regulation applications. This diode operates at a specific breakdown voltage and can maintain a constant voltage across its terminals, making it ideal for stabilizing voltage levels in electronic circuits.


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

  • A: Anode
  • K: Cathode

Circuit Diagram

Include a circuit diagram illustrating the connections and operation of the 1N3993A Zener diode for a visual representation.

Key Features

  • Voltage Regulation: The 1N3993A provides stable voltage regulation by maintaining a constant voltage drop across its terminals.
  • Zener Diode: This device operates in the breakdown region, allowing it to regulate voltage effectively.
  • Low Dynamic Impedance: The Zener diode exhibits low dynamic impedance, ensuring precise voltage control.
  • Temperature Stability: The 1N3993A offers temperature stability, making it suitable for varying operating conditions.

Note: For detailed technical specifications, please refer to the 1N3993A datasheet.


  • Voltage Regulation: Ideal for voltage regulation in power supplies, voltage reference circuits, and voltage stabilizers.
  • Overvoltage Protection: Used for overvoltage protection in electronic circuits by clamping the voltage at a specific level.
  • Signal Clipping: Suitable for signal clipping applications to limit the amplitude of input signals.


The 1N3993A Zener diode regulates voltage by conducting in the reverse breakdown region, maintaining a constant voltage drop across its terminals to stabilize voltage levels.

Usage Guide

  • Connect the Anode (A) terminal to the positive voltage source and the Cathode (K) terminal to the load or circuit ground.
  • Ensure that the Zener diode operates within its specified voltage range to achieve the desired voltage regulation.

Frequently Asked Questions

Q: Is the 1N3993A suitable for high-power applications?
A: The 1N3993A is typically used in low to moderate power applications due to its voltage regulation characteristics.


For similar functionalities, consider these alternatives to the 1N3993A:

  • 1N4728A: A Zener diode with a different breakdown voltage suitable for specific voltage regulation needs.
  • 1N5231B: This Zener diode offers comparable voltage regulation characteristics to the 1N3993A with a slightly different breakdown voltage.


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

Product Category Zener Diodes RoHS N
Brand Microchip Technology Ir - Maximum Reverse Leakage Current 100 uA
Product Type Zener Diodes Factory Pack Quantity 1
Subcategory Diodes & Rectifiers

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