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SMD marking codes / A4 SEE PICTURES what is that a diode??

« on: 08 December 2017, 23:25:28 »

i ordered the wrong parts the S4 IN5817 or 19 but they are almost 2x smaller and not the same i presoome.
the ones i need has an A4 code and 3 or 4 vertical stripes.
but what, i need to replace it on my micro quadcopter