# How do I pick a part that goes into a breadboard when I order it?

I have just bought some 555 timers and they are timers for microelectronic circuits...could anyone tell me what I need to search for in order to get larger ones which will fit a breadboard? Thanks

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You may have bought the 555 in a SMD package, but you need it in a DIP/DIL package –  m.Alin May 23 '12 at 19:01
Keep in mind that 555 timers are ancient archaic chips. There is little a 555 timer can do that a modern microcontroller can't to more accurately, with less power, and more repeatably. –  Olin Lathrop May 23 '12 at 19:06
Also, @James, don't let them give you crap for buying 555 timers. They are very useful analog circuits, and great learning tools. –  kevlar1818 May 23 '12 at 19:31
@OlinLathrop I think that the key is in the programming. You have tools, and know how to program them. But someone new to electronics does not have neither tools nor knowledge, so programming is like "climbing a mountain", for them. // Plus, I haven't used the 555 a lot, but I think it is a nice creature. Two analog comparators, an RS flip-flop, a discharge transistor and a high-current output stage. Good combination. That's a very versatile thing, for someone that is learning. –  Telaclavo May 23 '12 at 23:00
In a Le Mans start, I could breadboard a circuit to flash an LED with my choice of hardware faster than Olin could with a microcontroller. And I could make a two tone siren with fliding tone between (a la cop car siren in many araeas) faster than Olin could program one. And, Olin is utterly awesome. Even Olin could do the above faster with hardware :-). BUT beyond that level, the microcontroller wins. And, if you want to change the siren characteristics, or make them more coplex, the uC is far ahead. ... –  Russell McMahon May 24 '12 at 4:01

You want to look for a part in a "DIP" package.

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Damn short, but it's a complete answer. I can see nothing wrong in it. –  stevenvh May 24 '12 at 14:28
@stevenvh, A shorter answer leaves less room for mistakes. –  The Photon May 24 '12 at 16:03

OK, you know the answer from The Photon.

"DIP" package (a pleonasm) stands for "Dual In-line Package", also abbreviated to "DIL", for "Dual In Line". They have been used for 50 years, but they're used less now than 20 years ago.
Almost all DIPs have a 0.1", or 100 mils, pitch, the distance between the pins. Small DIPs are 300 mils wide, larger ones often 600 mils. In both directions that will fit in a breadboard, either a solderless or Veroboard style. You will have to press both rows together a bit.

Hobbyists often use DIP sockets when soldering.

They allow you to replace the IC without having to desolder it. There are also ZIF sockets (Zero Insertion Force), which are(were) for instance used in programmers where you have to insert and extract ICs all the time.

In recent years DIP has been replaced by SMDs (Surface Mounted Devices). They allow more compact products, are cheaper and offer technical advantages, like less inductance. You probably bought the SOIC (Small Outline IC) version of the LM555:

Other often used SMT (Surface Mount Technology) packages include the QFP (Quad Flat Package):

Many components are no longer manufactured in DIL packages, so you better get used to SMDs, both for ICs and discrete components:

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Note that the compression factor between DIP and DIL is 1, so technically it's not an abbreviation ;) But there should exist also SMD to DIP sockets, just for completeness –  clabacchio May 24 '12 at 13:08