---
title: "FET choice"
question: "Is the FET with the lowest Rds(on) the best one?"
url: "https://nearfieldnotes.com/videos/fet-choice/"
site: "Near Field Notes"
video: "https://nearfieldnotes.com/media/fet-choice/full.mp4"
duration: "0:19"
date: "2026-10-27"
note: "https://nearfieldnotes.com/notes/fet-choice/"
---

# FET choice (video)

Is the FET with the lowest Rds(on) the best one?

0:19, with sound. [Read Note 20](https://nearfieldnotes.com/notes/fet-choice/) for the full answer, with figures, conditions and sources.

## Transcript

Should you pick the MOSFET with the lowest Rds(on)?

With a strong gate driver, yes.

Now turn the gate current down.

The big FET has 13× the gate capacitance, so every edge drags out and burns energy.

At 60 mA, it wastes nearly 4× more.

---

Source: https://nearfieldnotes.com/videos/fet-choice/