1N4730A Zener Diode – 3.9V 1W ±5% DO-41 (2-Pack)

The 1N4730A is a 3.9V, 1-watt silicon Zener diode designed for voltage regulation, voltage reference, and circuit protection. Its ±5% voltage tolerance makes it suitable for power supply stabilization, electronic repairs, prototyping, and DIY electronics projects.

The compact DO-41 axial-lead package supports through-hole mounting. Each pack contains two diodes.

Key Features

• 3.9V nominal Zener voltage
• 1W maximum power dissipation under specified conditions
• ±5% Zener voltage tolerance
• Designed for voltage regulation and reference circuits
• DO-41 axial-lead package
• Through-hole mounting
• Cathode marked with a band

Technical Specifications

• Part number: 1N4730A
• Diode type: Silicon Zener
• Nominal Zener voltage: 3.9V
• Voltage tolerance: ±5%
• Maximum power dissipation: 1W under specified conditions
• Zener test current: 64mA
• Maximum Zener impedance: 9Ω at test current
• Package: DO-41 (DO-204AL)
• Mounting type: Through-hole
• Lead configuration: Axial
• Polarity: Cathode identified by band
• Quantity: 2 diodes

Common Applications

• Voltage regulation
• Voltage reference circuits
• Power supply stabilization
• Voltage limiting and protection
• Electronic equipment repairs

Package includes: 2 × 1N4730A Zener diodes.