ULN2003A: Output Clamp Current Pathway

Kelvin Tee

Genius 10035 points

Part Number: ULN2003A

The datasheet mentioned collector current = 500mA and showing below is my understanding of this definition.

Notice there is another parameter, output clamp current (Iok), could you advise how is the current flowing path?

Rgds
Kelvin

8 months ago

0 Patrick Shalton 8 months ago

TI__Mastermind 20310 points

Hi Kelvin,

The image you annotated correctly explains the collector current. Iok, output clamp current, refers to the maximum allowable current from each OUTPUT (each xC pin) through the respective clamp diode on the COM pin.

Thanks,

Patrick

0 Kelvin Tee 8 months ago in reply to Patrick Shalton

TI__Genius 10035 points

Hi Patrick,

There are two clamping diodes at the output.

Output clamp current is not applicable for the diode from C to E?

Rgds,
Kelvin

0 Patrick Shalton 8 months ago in reply to Kelvin Tee

TI__Mastermind 20310 points

Hi Kelvin,

Correct, Iok only applies for the diode from C to COM, and not C to E. Do you need the maximum current through the diode from E to C?

Thanks,

Patrick

0 Kelvin Tee 8 months ago in reply to Patrick Shalton

TI__Genius 10035 points

Hi Patrick,

Yes, it will be good if you could also provide the current through the diode from E to C.

Rgds,
Kelvin

0 Patrick Shalton 8 months ago in reply to Kelvin Tee

TI__Mastermind 20310 points

Hi Kelvin,

I am discussing with the team to see if anyone has this data. Since this is an old part, its data is not easily accessible.

Thanks,

Patrick

0 Patrick Shalton 8 months ago in reply to Patrick Shalton

TI__Mastermind 20310 points

Hi Kelvin,

Let's continue this thread via email - please see the one I sent.

Thanks,

Patrick

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ULN2003A: Output Clamp Current Pathway