Diode Small Signal - 1N4148

This is a very common signal diode - 1N4148. Use this for signals up to 200mA of current.

Diode Small Signal - 1N4148 Product Help and Resources

Button Pad Hookup Guide

January 7, 2016

An introduction to matrix scanning, using the SparkFun 4x4 Button Pad.

Beginner Parts Kit Identification Guide

March 22, 2019

The essential parts for beginning (or even experienced) hobbyists that gives you all of the basic through-hole components you will need to get started playing with embedded projects. We'll identify a few parts in the kit and provide a few basic circuits to get started!

Cherry MX Switch Breakout Hookup Guide

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How to assemble and use the Cherry MX Switch Breakout, allowing you to turn a matrix of mechanical switches into a full-size keyboard!

Hazardous Gas Monitor

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Build a portable gas monitor to check for dangerous levels of hazardous gases.


May 9, 2013

A diode primer! Diode properties, types of diodes, and diode applications.

Magnetic Levitation

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This tutorial will show you how to build a magnetic levitation circuit using common parts.

Flyback Diode

This part is used in our SparkFun Inventor's Kit as a flyback diode to prevent voltage spikes. For more information, try looking at some of the examples linked below that use this diode:

Core Skill: Soldering

This skill defines how difficult the soldering is on a particular product. It might be a couple simple solder joints, or require special reflow tools.

1 Soldering

Skill Level: Noob - Some basic soldering is required, but it is limited to a just a few pins, basic through-hole soldering, and couple (if any) polarized components. A basic soldering iron is all you should need.
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Core Skill: Electrical Prototyping

If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.

3 Electrical Prototyping

Skill Level: Competent - You will be required to reference a datasheet or schematic to know how to use a component. Your knowledge of a datasheet will only require basic features like power requirements, pinouts, or communications type. Also, you may need a power supply that?s greater than 12V or more than 1A worth of current.
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Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • JoshFranz / about 13 years ago / 23

    You know you have a good supplier if they not only admit they're not the cheapest, but also point you to who is cheaper. I appreciate the complete honesty, Sparkfun!

  • you know what because of that complete honesty from Sparkfun im going to not order from digi but order from Sparkfun!

  • stevenvh17 / about 9 years ago / 2

    The SMT equivalent is LL4148, unfortunately in the not so practical MELF package. (MELF = Many End up Lying on the Floor)

  • techmau5 / about 10 years ago / 2

    Maybe the most heavily stocked item on SparkFun :P

    • Member #466449 / about 10 years ago / 2

      That's funny because it's currently out of stock and there is no ETA.

  • Member #473748 / about 11 years ago / 1


  • Maxwellfire / about 12 years ago / 1

    what part in the Sparkfun Eagle library should I use?

    • MikeGrusin / about 12 years ago / 5

      Eagle comes with a number of standard libraries with thousands of parts; there's a 1N4148 in the DIODES library. You can search through the active libraries by using wildcards ("*") in the part name.

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