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I have a circuit board that has come out of a smart plug-in lamp dimmer/switch module. I would like to find the part number of a small SOT23-5 integrated circuit chip that is on this board. The SMT code appears to be FW7GE but I have been unsuccessful in a multitude of web searches and visiting manufacturer web sites to locate the actual part number that corresponds to the SMT top code.

Here is a picture of the chip zoomed in as far as I could and still maintain a decent focus. The chip seems to part of a switching power supply

enter image description here

Any help locating he part number would be much appreciated.

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    \$\begingroup\$ sot25-5 does not exist. There is sot25, or sot23-5. Take a photo of the entire module. \$\endgroup\$ – Ruslan Fatkullov Apr 13 at 23:58
  • \$\begingroup\$ I meant to say it was an SOT23-5. The SOT25 was an unintentional typo. \$\endgroup\$ – Michael Karas Apr 14 at 2:21
  • \$\begingroup\$ What do you think that part may be? Op-Amp? Comparator? Linear Regulator? Reference Voltage? Already probe it around? or Reverse Engineer it? It might give a big hint, and narrow the search field. \$\endgroup\$ – Unknown123 Apr 14 at 10:40
  • \$\begingroup\$ @Unknown123 - The chip is a buck switching power supply. On this board it is converting an input at ~4.2V down to a nice steady 3.3V. The 3.3V is used to power the MCU and RF receiver / transmitter in this smart plug-in lamp dimmer control. \$\endgroup\$ – Michael Karas Apr 14 at 13:14
  • \$\begingroup\$ 1. Does it has a feedback resistor? If yes it would be adjustable, if not it would be fixed version. 2. Does it have mosfet and schottky around it? if there are no mosfet and schottky, it's probably the internal power switch synchronous version. If there is a schottky and not the mosfet, it probably the internal power switch asynchronous version. If both, it probably the external power switch asynchronous version. If there are two mosfets and no schottky it probably the external power switch synchronous version. \$\endgroup\$ – Unknown123 Apr 15 at 0:09

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