ULN2803C: Max value of Icex: ULN2803A

Hi Kenji, 

We do not have that characterization data. 

We can only provide a guarantee to the values provided in the datasheet which denote the worst case ICEx at the worst case Vce condition (Vce=50V).

There will be the same or, more likely, less leakage at lower Vce voltage but I cannot provide a specific amount. 

To clarify, the collector cutoff current is the DC current into the collector terminal when it is biased in the reverse direction with respect to the emitter terminal and the base terminal is open. 

I am unclear on why the maximum leakage current specification of a device downstream would be an issue here. 

Could you clarify? 

Best Regards, 

Elizabeth 

Hi Elizabeth,

Thank you for your response.

They need to know that the leakage current of ULN2803A at Vce=5V does not exceed the specified Max required from the sensor side.

I would like to have the data as actual value to see if the current that is Sinked to the transistor does not exceed 20uA.

Regards,

Kenji

Hi Kenji, 

We will not be able to provide any ICEx data other than worse case at Vce = 50V. 

Could you clarify, do you mean you have a sensor between your supply and the collector? Could you share the part number and the connections between the ULN2803A and the sensor.

Is 20uA the limitation of how much current the sensor can draw? If so, it will exceed the 20uA limit when the device is operating. 

Or is the 20uA leakage limitation a system level constraint?

Best Regards, 

Elizabeth 

Hi Elizabeth,

Of course, the current flowing during normal operation isn't a problem, but They have a restriction on the sensor side they use.

I understand that there is no data available, but can you give me some advice on actual use?

Best Regards,

Kenji

ULN2803A.pdf

Hi Elizabeth,

Is there a leakage current for ULN2803C at Vce = 5V?

Not a guaranteed value, but a view of what the value would be I would like to have.

Regards,

Kenji