All About IC ULN2003

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Technology uln2003 Darlington Transistor LED Water Level Circuit with ULN2003 water level indicator uln2003 DataSheet simple water level indicator common-cathode inductive loads dropping resistor TTL

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The UNL2003 IC contains 7 High Voltage, High Current NPN Darlington Transistor Arrays each rated at 50V, 500mA in a 16-pin DIP package. You can connect the IC directly to a digital logic (like Arduino or Raspberry Pi, TTL or 5V CMOS device) without an external dropping resistor. This IC features "common-cathode flyback diodes" for switching inductive loads. The ULN2003 is known for its high current and high voltage capacity.

The Darlington pairs can be "paralleled" for higher current Output.
The inputs are capable with TTL and 5v CMOS logic.

Now, let's deep-dive and check out the internals of the IC and how it can be used in our projects.

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References
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DataSheet: https://github.com/tarantula3/ULN2003
Darlington transistor: https://en.wikipedia.org/wiki/Darlington_transistor
Open Collector Output: https://www.learningaboutelectronics.com/Articles/Open-collector-output.php
Transistor–Transistor Logic: https://en.wikipedia.org/wiki/Transistor%E2%80%93transistor_logic
CMOS: View https://en.wikipedia.org/wiki/CMOS
Parasitic Structure: https://en.wikipedia.org/wiki/Parasitic_structure

Related Videos
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NodeMCU Based - 3D Printed Indoor Gauge Thermometer: https://www.youtube.com/watch?v=vO6adrETQIA

Acronyms
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TTL: Transistor–Transistor Logic
CMOS: Complementary Metal–Oxide–Semiconductor

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