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18V Zeener Diode ( Pack of 5 )

Specification	Details
Zener Voltage (Vz)	18V
Power Dissipation	0.5W to 1W (Standard Lead Type)
Package Type	DO-35 / DO-41 (Through-Hole)
Tolerance	±5%
Operating Temp.	-65°C to +175°C
Quantity	Pack of 5

Price

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₹ 12.71

(Tax included)

बारकोड: 85478

Product Description

The 18V Zener Diode is a specialized semiconductor designed to allow current to flow backwards when a specific "Zener voltage" of 18V is reached. Unlike standard diodes that block reverse current, this device is engineered to maintain a stable 18V across its terminals, making it an essential component for voltage regulation, surge protection, and reference voltage generation. These diodes are provided in a through-hole package, ensuring easy soldering for hobbyists and professionals working on PCBs or breadboards.

Key Features

Precise Voltage Regulation: Maintains a consistent 18V output even when the input voltage fluctuates, protecting sensitive downstream components.
Overvoltage Protection: Acts as a "clamp" to prevent voltage spikes from exceeding 18V in low-power signal lines.
Durable Construction: Encapsulated in a high-temperature glass or molded case for long-term thermal stability.
Sharp Knee Characteristics: Provides a quick transition into the Zener breakdown region for reliable switching and regulation.
Standard Through-Hole Design: Features thick leads that fit perfectly into 2.54mm pitch breadboards and universal PCBs.

Technical Details

Reverse Leakage Current: Minimal current draw below the 18V threshold.
Forward Voltage Drop: Standard ~0.7V when biased in the forward direction.
Junction Type: Silicon Planar.

Prototyping and Engineering Tips from Robogears

The Series Resistor Rule: Never connect a Zener diode directly across a power source without a series resistor ($R_s$). Without a resistor to limit the current, the diode will attempt to regulate the entire source, leading to instant thermal failure (the "magic smoke").
Polarity in Regulation: To use this as a voltage regulator, you must install it in Reverse Bias. This means the side with the black band (Cathode) should face the positive voltage, while the other side (Anode) goes to the Ground.
Power Calculation: Ensure your circuit doesn't exceed the wattage rating. Power ($P$) is calculated as $Vz \times Iz$. For an 18V diode, if 20mA is flowing through it, it dissipates 0.36W. Ensure this is within the 0.5W or 1W limit of your specific batch.
Filtering Noise: If using this Zener for a clean reference voltage, place a 0.1uF ceramic capacitor in parallel with it. This helps filter out the high-frequency "Zener noise" that can sometimes interfere with sensitive analog-to-digital converters (ADCs).

Package Includes

5 x 18V Zener Diodes

Disclaimer: Do not exceed the maximum power dissipation rating. Always use a current-limiting resistor in series. Handle with care to avoid bending the leads at the point of entry into the diode body, which can crack the glass encapsulation.