Zener Diode 4.3V 1.3W

The Zener Diode 4.3V 1.3W is a zener diode with a breakdown voltage of 4.3 V and a power rating of 1.3 W. Connected in reverse bias with a series resistor, it holds the voltage across it close to 4.3 V, which makes it useful for simple voltage references, clamping signal lines and protecting inputs from overvoltage.

Zener Diode 4.3V 1.3W Specifications

• Zener voltage: 4.3 V
• Power rating: 1.3 W
• Maximum zener current: about 300 mA in theory (1.3 W ÷ 4.3 V); stay well below this in practice, especially when the diode runs warm
• Polarity: the band marks the cathode (K)
• Quantity: 1 piece

Zener Diode 4.3V 1.3W Applications

• Simple shunt voltage regulators with a series resistor
• Voltage references for comparators and ADC inputs
• Clamping and protecting microcontroller inputs
• Overvoltage protection on supply rails
• Electronics education and lab experiments

What's in the Box

• 1 × 4.3 V 1.3 W zener diode

Tip: Always use a series resistor to set the zener current. For example, from a 12 V supply a 390 Ω resistor gives about 20 mA ((12 − 4.3) ÷ 390), so the zener dissipates only about 85 mW and the resistor about 0.15 W.

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