3.9V 50W Reverse Polarity Zener Diode – Stud Mount (NTE5240AK)

High-Power Voltage Regulation with 3.9V Zener Diode

This 3.9V 50W reverse polarity Zener diode (NTE5240AK) delivers stable voltage regulation for high-current and industrial-grade electronics. Engineered for reliability and precision, this stud mount Zener diode is ideal for demanding applications that require sustained power dissipation and exceptional temperature stability.

Key Features and Benefits

• Nominal Regulating Voltage: 3.9V
• Power Dissipation: 50W
• Configuration: Reverse polarity (cathode to case connection)
• Package: DO-5 stud mount for secure chassis or heatsink installation
• Reliable solution for voltage reference and overvoltage protection

Applications

• Power supply regulation and stabilization
• Industrial control equipment
• Precision circuitry requiring a 3.9V reference
• Overvoltage protection and circuit protection

Technical Data

• NTE Part Number: NTE5240AK
• Nominal Zener Voltage: 3.9V
• Maximum Power: 50W
• Mounting Style: Stud mount (DO-5)
• Quantity per package: 1

Installation and Usage

The NTE5240AK features a stud mount DO-5 package for robust mechanical and thermal connection to a panel or heatsink. For optimal thermal performance, ensure the mounting surface is clean and flat. Use appropriate hardware and torque settings according to application requirements. Reverse polarity configuration requires correct orientation—cathode is electrically connected to the case.

This part is the equivalent replacement for the following:

1N4549R, 1N4549RA, 1N4549RB, ECG5240AK, ECG5240K, HZ50V3.9R, NTE5240AK, SK511, SK511/5240AK, TM5240AK