What is the SMD equivalent to an NTE123AP Transister?

Submitted by nwl5 t3_z73dk7 in DIY

I am working on a simple EL driver circuit based on this circuit from Jeri Elsworth.

https://ibb.co/PD4r20N

The only problem is that I want to shrink the board tremendously and found SMD equivalents to everything except the NTE123AP transistor.

I have looked at Google to try and find a solution but all I keep getting are SMD transistors with wildly different characteristics from the NTE123AP. If I were to do any more research I honestly wouldn't know where to start. I don't really know the proper things to look for when comparing THT components with SMD components.

I've used THT components for years but I am new to SMD.

What would be a decent SMD equivalent to this transistor?

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DerKeksinator t1_iy4kb83 wrote

Have you tried using the parametric search on mouser or digikey? Because utilising that, I can find lots of transistors that would work for your application, like the BCP/BCX55T for example, although it is a little slower.

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nwl5 OP t1_iy51vi2 wrote

I am actually not familiar with the parametric search. How would I go about performing a parametric search in Digikey or Mouser?

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NeverPostsGold t1_iy57ju4 wrote

Go to the transistor section and filter by the characteristics of yours.

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Riegel_Haribo t1_iy5h24h wrote

BC846B,215, or if you want two per package, BC846BPDW1T1G

The 16v+ capacitor will be larger than a thru-hole transistor.

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agate_ t1_iy6hszz wrote

That transformer's gonna be pretty big too.

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phantomplebe t1_iy56o6j wrote

I don't think any operating characteristics are going to be critical to that circuit, so you just need to meet or exceed the voltage and current ratings. https://www.digikey.com/en/products/filter/transistors-bipolar-bjt-single/276?s=N4IgjCBcoGwJxVAYygMwIYBsDOBTANCAPZQDaIALAAxwDMdIh1cFtVIAuoQA4AuUIAMq8ATgEsAdgHMQAX0IB2CohApIGHAWJkQtABxUArPE49%2BkIaMkz5IAExgqEaCD4CAqhLG8A8qgCyuOjYAK4iuIwgIQIAtgCCkTGSAjBU7LYOVLQqbhae3n6BwWERhNEWAGqJyRbUcoSZCC65IPm%2BAUGh4ZHlIDEA6tUSKXaG9SAAtHYqaqIhWiSQ5GMcsmtAA

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turbo_mc_turbo t1_iyfdtks wrote

dumb question - is the through-hole version catastrophically too big? You could trim the leads down to short stubs and then solder them onto surface mount pads.

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