SMD reverse voltage protection diode

Discussion in 'General Electronics Chat' started by Dritech, May 29, 2016.

  1. Dritech

    Thread Starter Well-Known Member

    Sep 21, 2011
    Hi all,

    I am doing my first project with SMD components. The circuit consumes around 200mA (MAX) of current and has a 5V voltage regulator. For reverse voltage protection of the circuit I was planning to include a diode at the input of the regulator.
    From the two diodes below, which would be best for this application? Since the CD1206-S01575 has a forward current of 150mA, will it work?

    Bourns CD1206-S01575
    Comchip Technology ACDBN140-HF
  2. dl324

    Distinguished Member

    Mar 30, 2015
    From the information given, the Schottky rectifier would be better.
  3. Bordodynov

    Active Member

    May 20, 2015
    Better or worse than the Schottky diode is determined by the input and output voltage. If the input voltage is substantially higher than the output voltage and the suitable silicon diode. If the input voltage is slightly higher than the output voltage, it is necessary and Schottky diode or MOS-transistor. For example, if the input voltage may drop to 5.5V, the regulator needs with small falls (LowDrop). By the way there are regulators with PNP transistor, which are not afraid of the negative input voltage. For example LT1763IS8-5 # PBF