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Topic: Identification of component (Read 275 times) previous topic - next topic

DougC

Hi There! I have a Time of flight sensor VL53LOX which I acidently un soldered this component and lost it could someone please identify it for me, it is the red looking item in the pictures.
Thank you
Doug

pert


6v6gt

My guess is that it is a diode, say 1N4148, on the XSHUT (/Shutdown)  to allow it to be connected a host  pin which exceeds the maximum allowed voltage of the chip.


DougC

Thank you
for your reply, I am using it with an Arduino Pro Mini is itb required to be there if I amonly using Vcc Gnd SDA and Scl

6v6gt

It should be OK. I guess the circuit is derived from this one:

https://cdn-learn.adafruit.com/assets/assets/000/037/548/original/adafruit_products_schem.png?1479934913

If you are not using XSHUT it does not matter. If you do later decide to use it, you must replace the diode  (not just bridge it) because the pins on the VL53LOX should not be exposed to more than 2.8 volts.

DougC


MarkT

That diode is in a MELF package, for completeness.  That means leadless.
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

Paul__B

Hi There! I have a Time of flight sensor VL53LOX which I acidently un soldered this component and lost it could someone please identify it for me, it is the red looking item in the pictures.
Losing it is not at all surprising.

How you would "accidentally unsolder" it - now that is pretty bizarre!  :smiley-eek:

JohnRob

DougC

The board you have includes 10 or so components that allow the board to be operated at either 3.3Volts or 5 Volts.  The diode is one of these components.   This diode configuration only works when that particular input has the following two states to operate:

1) Open circuit - an internal pull up brings the sensor pin to 3.3v and this diode allows the board input to go to 5V without damaging the sensor

2) Grounded.  For both 3.3V and 5V grounded is the same.

As for replacement you can google 1n4148 as suggested above.  They should be able to be found almost everywhere (ebay, Digikey......).

You might also look for a pair of tweezers to hold the new one in place as you solder.   And if it was accidentally unsoldered because the iron used was way too large, you might look for a smaller iron and some thinner solder.


BTW a MELF package in leadless (as the photo clearly shows) but more than that the MELF package is electrodes consisting of metal plugs.  These plugs allow the diode die to dissipate more heat.  However heat dissipation is of no consequence in the design.
Please do not PM me with thread based messages.  If your thoughts are worth responding,  the group should benefit from your insight.

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