Denon 20205004900as Zener Diode 39V 0.5W

Product Description

The DENON 20205004900as is a 39-volt zener diode rated at 0.5 watts, used as a voltage-regulation component in Denon consumer electronics. Zener diodes hold a fixed reverse-breakdown voltage, protecting downstream circuit stages from voltage spikes and ensuring stable reference levels. This part is identified by the internal designation ZJ39B and is a direct OEM replacement intended for technicians performing board-level repair on Denon receivers and related audio equipment. Component-level soldering skills and proper ESD precautions are required for correct installation.

This diode is drawn from Denon's triac, diode, and resistor parts line, covering consumer electronics and receiver applications. It is suited for repair shops and electronics technicians who perform component-level service on Denon audio equipment rather than full-board swaps. The 0.5-watt power rating makes it appropriate for low-power signal and regulation circuits commonly found in AV receiver designs.

Key Features

• 39-volt zener breakdown voltage for stable voltage regulation
• 0.5-watt power dissipation rating
• OEM Denon part for accurate like-for-like replacement
• Internal designation ZJ39B for cross-reference identification
• Designed for board-level repair of Denon consumer electronics

Compatibility

Designed as an OEM replacement component for Denon receivers and consumer electronics requiring a 39V 0.5W zener diode. Verify the ZJ39B designation and circuit location on the service schematic before ordering.

Installation Notes

Installation should be performed by a qualified electronics technician with component-level soldering experience. Power down and unplug the unit completely before beginning any board-level work, and allow filter capacitors to discharge fully. Use proper ESD precautions including a grounded wrist strap and anti-static work surface. Observe correct diode polarity by referencing the service schematic before soldering.

Technical Specifications

• Voltage Rating: 39 volts
• Power Rating: 0.5 watts
• Component Type: Zener Diode
• Internal Designation: ZJ39B

Standard Information

• Brand: DENON
• Manufacturer Part Number: 20205004900as