Layout – How well tap cells reduce latch up in std cell layout

If you're working on a standard cell layout, you definitely want to include tap cells strategically. Without them, you risk creating isolated p-well or n-well regions, which can lead to potential latch-up under transient conditions. When you insert tap cells at proper intervals, you’re essentially providing a low-resistance path to ground or power, which prevents parasitic thyristor structures from turning on. You’ll also find that EDA tools usually have options to automate this, making your job easier and your layout more robust.