Symbol vs footprint concept in PCB Design - Formula Comparison Trace

Sample Data

This table shows components with their schematic symbol pins and PCB footprint pads.

Cell	Value
A1	Component
B1	Symbol Pins
C1	Footprint Pads
A2	Resistor R1
B2	2 Pins (1, 2)
C2	2 Pads (Pad1, Pad2)
A3	Capacitor C1
B3	2 Pins (1, 2)
C3	2 Pads (Pad1, Pad2)
A4	IC U1
B4	8 Pins (1 to 8)
C4	8 Pads (Pad1 to Pad8)

Formula Trace

Pins match Pads for each component

Step 1: Compare R1 Symbol Pins (2) with R1 Footprint Pads (2)

Step 2: Compare C1 Symbol Pins (2) with C1 Footprint Pads (2)

Step 3: Compare U1 Symbol Pins (8) with U1 Footprint Pads (8)

Step 4: Overall check if all components have matching pins and pads

Cell Reference Map

    A          B               C
1 |Component|Symbol Pins   |Footprint Pads|
2 |R1       |2 Pins (1, 2) |2 Pads (Pad1, Pad2)|
3 |C1       |2 Pins (1, 2) |2 Pads (Pad1, Pad2)|
4 |U1       |8 Pins (1 to 8) |8 Pads (Pad1 to Pad8)|

The formula compares the number of pins in the symbol column (B) with the number of pads in the footprint column (C) for each component in column A.

Result

    A          B               C               D
1 |Component|Symbol Pins   |Footprint Pads|Match Result|
2 |R1       |2 Pins (1, 2) |2 Pads (Pad1, Pad2)|Match      |
3 |C1       |2 Pins (1, 2) |2 Pads (Pad1, Pad2)|Match      |
4 |U1       |8 Pins (1 to 8) |8 Pads (Pad1 to Pad8)|Match      |

The result column (D) shows that for each component, the symbol pins count matches the footprint pads count, confirming correct mapping.

Sheet Trace Quiz - 3 Questions

What does the symbol represent in PCB design?

A The wiring connections on the PCB

B The physical layout of pads on the PCB

C A graphical representation of the component in the schematic

D The software code for the component

Key Result

Compare the count of symbol pins to footprint pads for each component to verify correct mapping.