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12V Zener Diode - Voltage Regulator (Pack of 5)

Specification	Details
Zener Voltage (Vz)	12V
Power Dissipation	0.5W to 1W
Package Type	DO-35 / DO-41
Voltage Tolerance	±5%
Operating Temp.	-65°C to +175°C
Quantity	Pack of 5

Price

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₹ 12.71

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बारकोड: 74122

Product Description

The 12V Zener Diode is a specialized semiconductor designed to maintain a fixed 12V output, making it indispensable for voltage regulation and circuit protection. Unlike standard diodes that block reverse current, a Zener diode is engineered to allow current to flow backward once a specific "breakdown voltage" is reached. This characteristic allows it to act as a stable reference point in analog circuits, protect sensitive components from voltage spikes, and clamp waveforms at a precise 12V level. These diodes come in a standard through-hole package, ensuring compatibility with breadboards and universal PCBs.

Key Features

Precise Voltage Regulation: Maintains a steady 12V reference, ensuring consistent power for sensors and logic gates.
Overvoltage Protection: Safely clamps transient spikes above 12V, preventing damage to downstream microcontrollers or ICs.
Sharp Breakdown Knee: Features a well-defined transition into the Zener region for highly accurate switching and clipping.
High Thermal Tolerance: Built to operate reliably across a wide temperature range, from extreme cold to high-heat industrial environments.
Easy Prototyping: Features flexible, tinned leads that are easy to bend and solder, fitting perfectly into standard 0.1-inch pitch boards.

Technical Details

Zener Impedance: Low dynamic resistance for better regulation.
Encapsulation: High-quality glass or molded epoxy housing.
Mounting Type: Through-hole axial leads.

Prototyping and Engineering Tips from Robogears

The Series Resistor Rule: You must always use a current-limiting resistor in series with the Zener diode. Without this resistor, the diode will attempt to regulate the entire source current, leading to immediate thermal failure and a "blown" component.
Reverse Bias for Regulation: To use this as a voltage regulator, the diode must be installed in Reverse Bias. The end with the black ring (Cathode) should be connected to the positive rail, while the other end (Anode) goes to Ground.
Wattage Calculation: Ensure your circuit doesn't exceed the diode's power rating. For a 12V Zener, the power dissipated is calculated as Voltage multiplied by Current. If your diode is 0.5W, keep the current below 40mA to ensure long-term stability.
Noise Suppression: If you are using the Zener to provide a reference for an Analog-to-Digital Converter (ADC), place a small 0.1uF ceramic capacitor in parallel with the diode. This helps filter out the microscopic high-frequency noise produced during the Zener breakdown process.

Package Includes

5 x 12V Zener Diodes

Disclaimer: Do not exceed the maximum power dissipation or current ratings. Always use a calculated series resistor to prevent overheating. Handle with care to avoid mechanical stress on the glass body, which can cause micro-cracks.

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