LM2903: HELP WITH IDENTIFICATION IC PART NUMBER

Bang Duong

Part Number: LM2903

Tool/software:

Hi,

I want to know the part number of IC marking "OC TI MAP" in the picture below.

I found that this part may be LM2903, but when I checked pin 4 of this IC in the picture is not a Ground pin like LM2903 datasheet.

What is the correct part number of this part?/

Thanks,

0 Bang Duong 2 months ago

Hi,

In addition, information, As I checked, Pin 4 connects through 1 capacitor to the ground.

+1 Paul Grohe 2 months ago in reply to Bang Duong

Hi Bang,

Most likely they are using it on a "split" supply, where the GND pin is actually a negative voltage, such as -5V.

It is possible to use the LM2903 with split supplies, say -5 and +5, but realize that the output will then swing "low" to the negative (-5V) voltage.

What voltage do you actually measure on pins 4 and 8 while in operation?

But "MAP" is a valid device code for the LM2903DGKR in VSSOP package.

0 Bang Duong 2 months ago in reply to Paul Grohe

Thank you.

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