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ULN2803A: Missing data in datasheet

Uri Garbi
Intellectual 285 points

Part Number: ULN2803A

Unlike in the ULN2003B datasheet, the datasheet of the 2803A does not provide information about:

1. switching characteristics over the entire temperature range. I am particularly interested in -25C and +40C

2. VCE(sat) vs. Ic over the temperature range. Again -25C and 40C are the most relevant for me.

Is there a TINA-TI model for this device? I can't find one.

Thanks

Uri

  • 0
    TI__Genius 10855 points

    Hi Uri, 

    Thanks for reaching out on E2E! 

    Unfortunately, this being an older device, we don't have this information available on hand. Let me try looking through our older databases to see if I can find this.

    In the meantime, if you provide me more information regarding your application, I can see if the ULN2803A is a good fit for the application. What are your operating conditions?

    Thanks,

    Arthur Huang

    To find the latest information on Power Switches, visit www.ti.com/powerswitch

  • 0 in reply to Alpha H
    Intellectual 285 points

    Hi Arthur,

    I am using this part to control 8 fiber optic transmitters simultaneously in a 5V circuit, but in a noisy (high voltage) surrounding.

    This is why I prefer not to use 5V parts like ULN2003LV or SN75452 that have a 5.5V input maximum rating. I have already seen a ULN2003LV failing in a similar application.

    Basically the control signal is a 3.3V IO, and the ULN is to be connected in the low side of the transmitting LEDs, each of them is pulled up through a resistor and draws 25mA when ON.

    So the ULN is to be normally ON and carry 200mA continuously.

    I looked at the ULN2803A since it is faster than the ULN2003B, and I need the switching OFF to be fast. 

    Thanks

    Uri

  • 0 in reply to Uri Garbi
    TI__Genius 10855 points

    Hi Uri,

    Thanks for the additional background.  Unfortunately I couldn't find this information in our database. However, the ULN2003B VCE(sat) vs. Ic should be a good baseline to determine the saturation voltage across temperature.

    I don't see any issues operating the device at 5V @ 200mA. If you have a specific condition or configuration that you are worried about, you can send us schematics for review or scope shots, and a design engineer can help with an analysis. Otherwise, you can test a few units and see if they are able to withstand your conditions.

    Thanks,

    Arthur Huang

  • 0 in reply to Alpha H
    Intellectual 285 points

    Hi Arthur,

    Thanks for this. 

    Can you comment on whether a spice model is available for this part?

    Regards

    Uri

  • 0 in reply to Uri Garbi
    TI__Genius 10855 points
    Hi Uri,

    Unfortunately, I looked through our repository and was unable to find a SPICE model for the ULN2803A or the ULN2003a.

    Thanks,
    Arthur