Voltage Regulator identification and substitution

Thread Starter

usagoal

Joined Nov 26, 2020
3
I have pictured is what I believe to be an LDO voltage regulator(?) I've been using google to help identify this part as much as possible. The package size seems to be SOT-23 thin. It has 162C printed on the top (my pic does not show it completely). I'm looking at replacements on digikey, but need advice (guidance), if possible, for a substitute. Measurements I've taken from a working board: the input voltage is around 7.2v (battery pack voltage) and the output is 3.3v. Thank you!voltage regulator.jpg
 

Thread Starter

usagoal

Joined Nov 26, 2020
3
Sigma, thank you for the reply. I've attached a better pic and it seems to me it is a "1". I agree the original picture was not too clear. The functioning board that I have also shows a 1 when I inspected under the microscope (in case my eyes were deceiving me).

I've also attached a very...very rough partial diagram/layout of the component in question with some surrounding connections. Pin numbers are for reference and under the assumption this is a "LDO voltage regulator". I removed the component from the board to verify the traces and any other connections. Seems like pin 1 is input voltage when I traced it back to source (battery). Pin 2 is ground as I can see it soldered to the ground plane. And pin 6 seems to be voltage out to a "potted" logic device? Pins 3 and 4 have absolutely no connections that I can see when I removed the component.

From what I've been reading from datasheets, pin 3 is typically used to turn the regulator on/off. This is the description from a datasheet to a potential replacement component:
"Enable pin. Driving this pin high turns on the regulator. Driving EN pin low puts the regulator into shutdown mode."
This "162C" has no such connection and seems to be "on" without an input on pin 3. I tested the good board and I did not get any signal from this pin, yet it was knocking the 8 volts from pin 1 down to 3.3 volts on pin 5.

Upon further research I found some potential replacements from digikey, however this pin 3 on/off dilemma has me a little stumped. Thank you and your thoughts are appreciated.
 

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