Electrical Rules Check (ERC) in PCB Design - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Electrical Rules Check (ERC) in PCB design?

ERC is a process that checks a PCB design for electrical errors like missing connections or wrong pin types before manufacturing.

beginner

Name two common errors that ERC detects.

ERC commonly detects unconnected pins and conflicting pin types (like output connected to output).

beginner

Why is running ERC important before PCB fabrication?

Running ERC helps catch electrical mistakes early, saving time and cost by avoiding faulty boards.

intermediate

How does ERC differ from Design Rules Check (DRC)?

ERC checks electrical connections and logic, while DRC checks physical layout rules like spacing and sizes.

intermediate

What should you do if ERC reports a pin conflict?

Review the schematic to fix the pin types or connections causing the conflict, then rerun ERC to confirm.

What does ERC primarily check in a PCB design?

A Solder mask layers

B Physical spacing between components

C Electrical connections and pin types

D Board outline dimensions

ERC focuses on electrical connections and pin compatibility, not physical layout.

Which error would ERC most likely detect?

A Copper trace width too narrow

B Two output pins connected together

C Component footprint misaligned

D Missing solder mask opening

ERC detects electrical conflicts like output-to-output pin connections.

When should you run ERC during PCB design?

A After soldering the board

B Only after PCB fabrication

C After placing components on the board

D After schematic completion and before layout

ERC is run on the schematic to catch electrical errors early.

If ERC reports an unconnected input pin, what does it mean?

A The input pin has no wire or signal connected

B The input pin is connected to ground

C The input pin is connected to an output pin

D The input pin is shorted to power

An unconnected input pin means it has no connection, which may cause circuit issues.

Which tool would you use to check physical spacing rules in PCB design?

A Design Rules Check (DRC)

B Electrical Rules Check (ERC)

C Bill of Materials (BOM) generator

D Gerber viewer

DRC checks physical layout rules like spacing and clearances.

Explain what Electrical Rules Check (ERC) is and why it is important in PCB design.

Think about how ERC helps avoid mistakes in the circuit wiring.

Describe the difference between Electrical Rules Check (ERC) and Design Rules Check (DRC).

One focuses on electrical connections, the other on board geometry.