---
title: What is a Sinking or Sourcing Input?
description: Sinking and Sourcing inputs simply refer to the current flow in a transistor.
---

<https://www.dynapar.com/faq>

# [What is a Sinking or Sourcing Input?](https://www.dynapar.com/faq/what-is-a-sinking-or-sourcing-input)

 Written by [London Rhodes](https://www.dynapar.com/faq/author/london-rhodes) | Jun 18, 2021 6:35:42 PM

Sinking and Sourcing inputs simply refer to the current flow in a transistor. This means that they require a voltage and a load to operate. A sinking input requires the voltage and load to be present before connecting it to the circuit. This means that it is "sinking" the current to ground for the circuit. A sourcing input must be before the load in the circuit. This means that it is "sourcing" the current to the circuit. Voltage and a load must be present in either case to detect a voltage change at the input. The same is true for sinking or sourcing outputs.

[View full post](https://www.dynapar.com/faq/what-is-a-sinking-or-sourcing-input)

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