1N4742A 1W, 12V Zener Diode
Review: 5 - "A masterpiece of literature" by John Doe, written onMay 4, 20020
1N4742A 1W, 12V Zener Diode
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1N4742A 1W, 12V Zener Diode

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  • Product SKU: DIODE004
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The 1N4742A is a popular Zener diode, which is specifically designed to operate in the reverse breakdown region, maintaining a constant voltage across its terminals.

Here's a detailed description of its specifications:

Type: The 1N4742A is a Zener diode, a type of semiconductor device designed to provide a stable voltage reference or voltage regulation in electronic circuits.

Power Dissipation: It can dissipate up to 1 watt of power under normal operating conditions.

Zener Voltage: The "12V" designation indicates that the nominal Zener voltage for the 1N4742A is 12 volts. This means that when the diode is reverse biased and conducting, it maintains a relatively constant voltage drop of approximately 12 volts across its terminals.

Tolerance: The letter "A" in the part number indicates a tolerance level. In this case, it might indicate a tolerance of +/- 5%.

Package Type: The 1N4742A is typically available in through-hole packages, such as axial leads or radial leads, making it suitable for easy mounting onto circuit boards.

Construction: Zener diodes are usually constructed using heavily doped semiconductor materials, allowing them to exhibit a sharp breakdown voltage when reverse-biased.


The 1N4742A can be used in various applications requiring voltage regulation or voltage reference, such as voltage stabilizers, voltage clamps, voltage regulators, and surge suppressors.

Temperature Range: Like most semiconductor devices, the 1N4742A is designed to operate over a specified temperature range, typically from -65°C to +175°C, ensuring reliable performance across different environmental conditions.


  • Low profile package
  • Built-in strain relief
  • Low inductance
  • High temperature soldering : 260°C/10 seconds at terminals
  • Glass package has Underwriters Laboratory Flammability Classification

Technical Details

  • Reverse Voltage: 3.3 Volts to 75 Volts
  • Forward Current: 1 Watts
  • Case: Molded Glass DO-41G
  • Terminals: Axial leads, solderable per MIL-STD-750, Method 2026 guaranteed
  • Polarity: Colour band denotes the positive end
  • Mounting position: Any

Product Video


Package Includes

  • 1 x 1N4742A 1W, 12V Zener Diode

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