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switch 200mA @ 5V best value option?

Stephen Kramer
Prodigy 210 points
Other Parts Discussed in Thread: ULN2003A, TPS22918

Hello,

I am working on a project that needs to switch several LEDs that run at ~50 to 100mA each at 3 to 5V.  I want to control them via a 5V microcontroller with a digital output or PWM signal.  

What is the best value (most efficient and lowest-cost) component you would recommend in a through-hole or DIP package? I'm not interested in a driver, just something like a FET switch.  Are there overview document(s) for switches within this specification?

Thanks,

Stephen

  • 0
    TI__Mastermind 24975 points
    Hello Stephen,

    I would suggest you take a look at the ULN2003A. This device is a 7 channel low side darlington pair array, so you can drive 7 LEDs or even more if some of the LEDs are in series.

    Essentially, if you connect the LED cathode to the supply voltage and the anode to the Output channel of the device, then you control each of the outputs through its corresponding input. You also have to have a current limiting resistor so that the current through the LED is set appropriately. When I say low side, I mean that it connects to ground. So the device does not provide power to the LED but it allows current to flow and can manage high current that you mention and the inputs can be controlled by a 5V or 3.3V MCU.

    This device also comes in a dip package since that is something you are interested in.
    Let me know if you have any additional questions about this device.

    Best,
    Michael
  • 0
    TI__Genius 15770 points

    Hi Stephen,

    We do not have any load switches which come in a through-hole or DIP package.  We do have some devices with leads, but they are all surface mounted.  Would one of these switches work?  If so, the TPS22918 can be used.

    Thanks,

    Alek Kaknevicius

  • 0 in reply to Michael J Schultis
    Prodigy 210 points
    Mike,

    This looks like the right performance. I am concerned about the cost, this is for a small toy in larger quantities. If I only need 2 or 3 outputs at < 100mA each @6V would your recommendation change?

    Thanks,
    Stephen
  • 0 in reply to Aleksandras_Kaknevicius
    Prodigy 210 points
    Alek, thanks this looks like a good match performance-wise. I am doing the development testing myself via breadboard so thus the interest in DIP/through hole. What categories can I search under on the TI website that might have dip/through hole parts that might work here? Thanks.
  • 0 in reply to Stephen Kramer
    TI__Mastermind 24975 points

    Hello Stephen,

    Yes, I would still recommend the ULN2003A in this case. Its 7 channels but its not an expensive device in general. Its a very bare bones solution to what you are suggesting, and many people use this device for just this application.

    This has these type of devices sorted by PDIP, and you can sort by cost. ULN2003A floats to the top.

    http://www.ti.com/lsds/ti/interface/peripheral-driver-and-actuator-products.page#p2954=PDIP

    Best,
    Michael