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5.1V Zeener Diode ( Pack of 5 )

Specification	Details
Zener Voltage ($V_Z$)	5.1V
Power Dissipation ($P_D$)	500mW (0.5W)
Tolerance	±5%
Package Type	DO-35 (Axial)
Diode Type	Voltage Regulator
Operating Temperature	-65°C to +175°C

Price

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₹ 12.71

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Barcode: 879456

Product Description

The 5.1V Zener Diode is a specialized semiconductor designed to maintain a stable fixed voltage across its terminals, making it an essential component for voltage regulation and circuit protection. Unlike standard diodes that block current in reverse bias, a Zener diode is engineered to "break down" at a precise voltage (5.1V in this case) and allow current to flow backward without being damaged. This characteristic allows it to act as a simple yet effective voltage reference for microcontrollers, sensor interfaces, and power supply rails. Housed in a compact glass DO-35 package, these diodes are ideal for space-constrained PCBs and educational breadboard experiments.

Key Features

Precise 5.1V Regulation: Ideal for creating a 5V-compatible reference signal or clipping signals to protect 5V logic inputs.
Sharp Breakdown Characteristic: Provides a clean transition into the Zener region, ensuring minimal voltage drift under varying load conditions.
Compact Glass Packaging: The DO-35 axial package offers excellent hermetic sealing and high-temperature stability.
Over-Voltage Protection: Acts as a "clamp" to prevent sensitive components from seeing voltages higher than 5.1V.
Low Leakage Current: Features high resistance below the Zener threshold, minimizing power waste in battery-operated devices.

Technical Details

Mounting Style: Through-hole (Axial).
Polarity: Cathode is marked with a distinct black band on the glass body.
Test Current ($I_{ZT}$): Typically 5mA to 20mA.

Prototyping and Engineering Tips from Robogears

Reverse Bias is Key: CRITICAL: To use this as a voltage regulator, you must connect it in Reverse Bias. This means the side with the black band (Cathode) should face the Positive (+) rail, and the other side (Anode) should face Ground (-). If connected in forward bias, it will act like a normal diode with a ~0.7V drop.
The Current-Limiting Resistor: You must always place a resistor in series with the Zener diode. Without a resistor, the diode will attempt to regulate the entire power supply's current, leading to instant thermal failure. Calculate the resistor value using: R=(Vinput−5.1V)/Idesired.
Logic Level Shifting: If you are interfacing a 12V sensor with a 5V Arduino, a 5.1V Zener diode can be used as a "clipper" to ensure the Arduino pin never sees more than 5.1V, preventing permanent damage to the microcontroller.
Power Limits: This is a 0.5W (500mW) diode. At 5.1V, the maximum current it can safely handle is roughly 98mA (500mW/5.1V). For long-term reliability, design your circuit to keep the Zener current below 50mA.
Voltage Noise: Zener diodes can generate a small amount of "shot noise" during breakdown. If using this as a reference for a high-precision Analog-to-Digital Converter (ADC), place a small 0.1µF ceramic capacitor in parallel with the diode to filter out high-frequency noise.

Package Includes

5 x 5.1V Zener Diodes

Disclaimer: Ensure the input voltage is higher than 5.1V for regulation to occur. Always verify the power dissipation limits of your circuit to avoid overheating the diode. Do not use as a primary power regulator for high-current loads; use an active voltage regulator IC (like the 7805) for loads exceeding 100mA.