ULN2003LV: IO Buffer

John B

Part Number: ULN2003LV
Other Parts Discussed in Thread: ULN2003A, TPL7407LA, ULN2803C

Tool/software:

Hello,

We have 8 x GPIO from Microcontroller which need to be connected at a remote location which is around 8 to 10 meters. The load current is something around 25 mA per GPIO. Kindly suggest line buffer/GPIO buffer that can be used with the Microcontroller board which we need to design. It is important that there should be no I2C. Just a simple parallel in parallel out.

3 months ago

0 Patrick Shalton 3 months ago

TI__Mastermind 25830 points

Hi John,

ULN2003A (BJT-based) is the simplest device that can support this. If you need lower output low voltage, ULN2003LV (low voltage) or TPS7407LA will work also as they are based on MOSFETs.

These devices are inverting, is that ok?

Thanks,

Patrick

0 John B 3 months ago in reply to Patrick Shalton

Intellectual 325 points

The application is that we need to control Relays which are located remotely on Relay board. The switching of Relay is slow and the voltage levels are 0 V and 3.3 V for Relays. The Relay boards are located around 8 to 10 meters away from Microcontroller. Therefore, we are looking for single ended I/O buffer IC.

I will look at ULN2003LV.

But TPS7407LA is LDO linear regulator, right ?

+1 Patrick Shalton 3 months ago in reply to John B

TI__Mastermind 25830 points

Hi John,

My apologies, it should be TPL7407LA.

-ULN2003A is BJT-based, up to 500mA/single channel

-ULN2003LV is MOSTET-based, up to 100mA/single channel at 3.3V

-TPL7407LA is MOSFET-based, up to 600mA/single channel

Those are all 7 channel devices. For 8 channels, please see ULN2803C, which is very similar to ULN2003A.

Thanks,

Patrick

0 John B 3 months ago in reply to Patrick Shalton

Intellectual 325 points

Thanks.

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ULN2003LV: IO Buffer