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I'm making a project where I redesign my old calculators PCB, so I could read the button presses with an arduino. The general design is done, all that's left is to decide on which diode is going to be used. I'm working in EasyEDA, so I added the first default diode available when I made the schematic.

I'm new to electronics, so I have no idea how to choose. It should be available in LCSC store so I can order my PCB with the diodes already soldered.

What parameters should I look out for? How can I find the right diode for my project?

The default diode offered by EasyEDA: https://lcsc.com/product-detail/Diodes-General-Purpose_Foshan-Blue-Rocket-Elec-1N4007W_C328592.html

My design:

enter image description here

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    \$\begingroup\$ BAS16 (2 pin version or chage to SOT23), 1N4148 (SMD equivalent). Don't use 1N400x types because if you have a fast scan rate it might cause problems. \$\endgroup\$
    – Andy aka
    Commented May 29, 2020 at 13:01
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    \$\begingroup\$ I would second the SOT23 as they are far more widely available than many two contact devices. \$\endgroup\$
    – Peter Smith
    Commented May 29, 2020 at 13:02
  • \$\begingroup\$ Alright, thanks guys! \$\endgroup\$
    – leventecsoba
    Commented May 29, 2020 at 13:03
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    \$\begingroup\$ As others have said some kind of IN4148 or similar part - go to LCSC an pick their cheapest switching diode. \$\endgroup\$
    – Jasen Слава Україні
    Commented May 30, 2020 at 10:23

1 Answer 1

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I suggest you use LL4148, the MELF version of the 1N4148, which is very common in Asia. LCSC lists 15 or 20 different manufacturers and types. enter image description here

enter image description here

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  • \$\begingroup\$ MELF can be tricky for hand assembly, but I can see than land pattern mitigating their tendency for undesired mobility. \$\endgroup\$
    – Jasen Слава Україні
    Commented May 30, 2020 at 10:26
  • \$\begingroup\$ @Jasen Solder paste holds them in place nicely. If there is no stencil (gadzooks!) you solder one side first then the other. \$\endgroup\$
    – Spehro 'speff' Pefhany
    Commented May 30, 2020 at 10:31

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