Schematic Symbol for Seeed Studio XIAO MG24 DIP14: XIAO MG24 is an...

Pad Type Differences Explained

sher-a

what is the difference between smd, hold, std and conn in pad type

22 days

flux

1:05

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Knowledge Base

Clarifying pad types for PCB.

Understanding tool priorities for pad types.

Defining PCB pad types.

Using Knowledge Base Tool.

Reading docs for: "In Flux PCB footprint and pad settings, what do pad types smd, hole, std, and conn mean? Clarify how each behaves (copper layers, drill, plating, soldermask/paste, DRC/assembly intent) and when to use each (SMD pads, plated through-hole pins, non-plated mounting holes, connector footprints, testpoints). Provide concise definitions."

Reading docs for: "Explain all Pad Type options in Flux PCB: SMD, STD, CONN, HOLE. What does each do and when to use them?"

Clarifying pad types with @help.

Here’s what the Flux documentation says about Pad Type options:

"Pad Type

Modifies the type of pad to one of the following:

SMD – a surface mount pad with no drill hole.
HOLE – a drill hole with no copper.
STD – a through-hole pad. (STD stands for "Standard".)
CONN – a connector pad with no drill hole, often used at the edges of a board."

Source

When to use HOLE

Choosing CONN vs SMD

STD pad design details

Library footprint consistency

Mixed pad types on part

22 days

Ready.

S_R

BAT+

D18

D15

D10

D16

D12

D17

M_CLK

D14

M_R

BAT-

3V3

S_DIO

3V3

D13

GND

M_DIO

S_CLK

D11

Reviews

Electrical Rule Checks

Duplicate Designators • 2

	Components
	3V3, 3V3
	GND, GND

No-Connect Violation

Reports no-connect pins that are connected.

Missing Power

Reports power input pins that are not connected to a power source.

Single Pin Nets

Reports nets that have only one pin connected.

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Overlapping Copper

Reports copper elements that are shorting.

Invalid Layer

Reports nodes that are assigned to a layer that doesn't exist in the layout stackup.

Component Overrides

Reports components that have been modified using the "!important" flag.

Airwires

Reports missing routed traces between pads in a net.

Layers with Multiple Fills

Reports layers that have multiple copper fills of different nets. Make sure the Connected Layers rule value of nets with fills is valid.

Floating Copper

Detect any via, trace or copper fill island that is not connected to any net.

Protected Intrusions

Reports intrusions from objects of other nets into polygons or fills that have the Protected layout rule applied.

Missing Footprints

Reports components that need a footprint but don't have one.

Manufacturing

Manufacturer Part Number

Reports components that have no manufacturer part number.

Parts Available

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Checks that all components are available from distributors.

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Auto-Layout

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Reports issues with Auto-Layout if Flux cannot route something or must ignore a configuration.

Passive Components

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Checks that the power traveling across a given resistor is under its rating with 50% headroom.

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Checks that IC pins that require pull up or pull down resistors have them.

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Checks that capacitors have appropriate voltage ratings to prevent overheating and ensure reliable circuit operation.

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A common return path for electric current. Commonly known as ground.
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