Altium Component Errors
1:18
Providing general advice.
Identifying potential causes.
Addressing PCB errors.
Resolving annotation mismatches.
Accessing knowledge base.
Preparing to assist with Altium issues.
Got it—those Altium messages can be cryptic. A few common causes and quick checks usually clear “can’t add component” and pin-related errors:
First, clarify
- What is the exact error text from the Messages panel?
- When does it trigger: placing from library, ECO “Update PCB from Schematic,” or compiling an Integrated/DB library?
- Altium version and library type (SCHLIB/PCBLIB, IntLib, DBLib/SVNDbLib)?
Fast checklist
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Pin designators must match exactly:
- Open the schematic symbol and confirm every pin has a unique designator (no duplicates, no blanks).
- Open the linked PCB footprint and confirm pad designators match the symbol’s pins (1 ↔ 1, A ↔ A). Mismatches cause pin errors.
- Cross-check pin assignments against the datasheet; verify the symbol’s pin names match the device pins exactly (avoid swapped or aliased names).
-
Multi-part components:
- Ensure the part count and pin visibility per part are correct. Duplicate pins across parts or mis-assigned “Convert” settings will trigger pin errors.
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Library/model links:
- In the symbol’s Models tab, confirm the footprint link is valid (footprint exists, correct PCB library reference).
- If using Integrated/Database libraries, recompile/refresh the library so the latest symbol/footprint is used.
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Annotation and Unique IDs:
- If this appears during ECO, reset IDs to clear corruption: Tools -> Reset Component Unique IDs (schematic and PCB), then update PCB from schematic again.
- Run Annotate to ensure all designators are unique before updating.
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Variants and locks:
- Make sure the component isn’t excluded in the active variant.
- Check if an existing linked PCB component is locked (would block changes/updates).
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Read-only and VCS:
- Ensure SCH/PCB docs and libraries are not read-only (OS/VCS). Check files are writable.
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Path and cache oddities:
- Project -> Compile to refresh.
- If DBLib, verify connection and queries; if IntLib, rebuild it.
- Avoid special characters in library names/paths that can confuse mapping.
If you can paste the exact error line(s) and tell me which component triggers it, I can pinpoint the likely root cause and give step-by-step fixes (e.g., which pins/pads to rename or which ID/link step to run).
Share exact error text
Confirm library types
Check pad designators
Reset unique IDs
Multi-part component issue
83 days
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