iam working on a pcb project. How to find the equivalent SMD component for THT components like transistor,diode,FET? I got many part numbers while searching, so confused about SMD component selection.


closed as unclear what you're asking by Wesley Lee, winny, Matt Young, Harry Svensson, DerStrom8 Dec 1 '17 at 17:29

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    \$\begingroup\$ Identify the parameters which are important for your project, look for the parts with those parameters. You might find parts that are better than THT parts (not just equivalent). \$\endgroup\$ – Nick Alexeev Dec 1 '17 at 17:04
  • \$\begingroup\$ Wrong question. Just look for SMD parts that meet your specs. Whether they also come in some other package that you don't care about, is something you, well, don't care about. Congratulations for having finally emerged from the 1990s. \$\endgroup\$ – Olin Lathrop Dec 1 '17 at 17:31
  • \$\begingroup\$ Digikey.com is a good place to search for them \$\endgroup\$ – Mitu Raj Dec 1 '17 at 18:27
  • \$\begingroup\$ @OlinLathrop LOL 90s. Through hole still has a role though. Esp in high thermal variation, and extreme mechanical stress applications. \$\endgroup\$ – Trevor_G Dec 1 '17 at 18:52
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    \$\begingroup\$ @Trevor: Yes, I use thru hole for things like connectors, heavy things, sometimes things that dissipate significant power, and whenever extra mechanical strength is required. However, it's totally obsolete for basic small signal transistors and the like, which is what it sounds like the OP is asking about. \$\endgroup\$ – Olin Lathrop Dec 1 '17 at 19:10

You first need to check the data sheet for the devices and see if they are offered in SMT packages, many are available in different packages.

If not, you need to identify the key parameters that were used to chose the parts in the first place. If you did not design the circuit, then ask whomever did to pick the right SMT parts.

If you end up having to chose the parts yourself, visit one of the general suppliers like Digikey, or Mouser and use their nice parametric search part listings to find parts that meet or exceed the required paramaters. Do not forget to check the prices/availability too.


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