1N4744 15V ZENER DIODE DO-41

1N4744 If your board calls for a 15 V Zener diode in a DO-41 pack with two wire legs, this is the part to order. It holds the line near 15 V and guards the parts after it from voltage spikes. Check the checks below before you order, so the pack, the legs, and the power all match your board. This is an original, high-quality part.

What it does

A Zener diode works in a simple way. In normal use it blocks current one way. When the voltage across it climbs past its set point, it starts to pass current and holds the voltage near that point. For this part, that point is 15 V. That is why repair techs use it to steady a supply line and to clamp spikes before they reach chips that cost far more than this diode.

This is a through-hole part. It has a small glass or plastic body with a wire leg at each end. One end has a band on it. That band marks the cathode end. Put it the wrong way round and the circuit will not work as planned, so match the band to your board print.

Who it fits

This part fits you if you repair or build power supply boards, solar inverter boards, UPS boards, or surge guard boards, and your board print shows a DO-41 Zener diode at 15 V. It also fits if you are replacing a burnt or shorted 15 V DO-41 diode and your old part sat in the same through-hole spot.

It does not fit every job. If your board needs a different voltage, a surface-mount pack, or a part that can handle much more heat, this is not the right pick. Use the spec table below and match it line by line.

Checks before you order

• Voltage: your board must need 15 V. A 12 V or 18 V part will not do the same job.
• Package: your board footprint must be DO-41 with two through holes. A surface-mount part has a different shape and will not sit right on this footprint.
• Pin order and polarity: match the cathode band to the band mark on your board. The band end is the cathode.
• Current and power: work out the current your circuit will push through the diode, then check that 15 V times that current stays well inside the 1 W limit in the table below. If your circuit runs hot, pick a part rated for more power, not this one.
• Voltage range: the sheet gives 14.25 V to 15.75 V at the 17 mA test current. If your circuit needs a tighter range, check that range against your circuit first.
• Legs and space: check that the two wire legs fit your board holes and that the body has room around it for air flow.

Specifications

All figures below are from the series sheet for this part, 1N4744A row. No figure here was guessed.

Other names for the same part (good to know)

Shoppers and repair techs call this same part by a few names. 1N4744A is the same diode with the A suffix, which marks the ±5% range of 14.25 V to 15.75 V. 1N4744 on its own is the same part without the suffix letter. Do not mix this up with a part in a different pack even if the number looks close — a different pack will not fit your board the same way.

Frequently Asked Questions

Is 1N4744A the same as 1N4744?

Yes, for this listing. The A at the end marks the ±5% range of 14.25 V to 15.75 V. So 1N4744A is the 1N4744 with that range.

Is this a surface-mount part?

No. It comes in a DO-41 pack with two wire legs that go through holes in the board. It is not a flat surface-mount part.

What should I check before I order?

Check six things: voltage (15 V), package (DO-41), pin order and polarity (match the cathode band), current and power for your circuit, the 14.25 V to 15.75 V range, and that the legs fit your board holes.

Can I use a different voltage Zener diode in its place?

No. A Zener diode holds the line near its own set point, so a part rated at another voltage will hold the line at the wrong voltage. Match the 15 V value, the DO-41 pack, and the checks above.

What is the price of this part?

Check the live price on the website. The price shown on the product page is the current one.

You can view and download the datasheet for this part from the Datasheet button on this page.

This diode is made for voltage regulation and circuit protection in solar inverter components and other electronic uses. It suits power supply circuits, surge protection systems, and general voltage regulation work, and it is a steady, long-life part for solar power systems and other energy-sensitive circuits.