Altium Component Errors

flux

1:18

Project

Providing general advice.

Identifying potential causes.

Addressing PCB errors.

Resolving annotation mismatches.

Using Knowledge Base Tool.

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
  • 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.
  • 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.
  • 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.
  • 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).
  • Read-only and VCS:
    • Ensure SCH/PCB docs and libraries are not read-only (OS/VCS). Check files are writable.
  • 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
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C2
Capacitance
4.7u F
BUTTON_RIGHT
C6
Capacitance
1u F
RST
L1
Inductance
Inductance
RESET
BUTTON_DOWN
C1
BAT1
J2
BUZZER
UART_TX
DOWN
UART_RX
BUTTON_UP
3V3
BUTTON_LEFT
UP
BUTTON_UP
3V3
OK
BUTTON_OK
R3
Resistance
2.2k Ω
LEFT
UART_RX
BUTTON_OK
RIGHT
U1
BUTTON_RIGHT
UART_TX
3V3
J1
C3
RESET
BUTTON_LEFT
BUTTON_DOWN
R2
Resistance
10k Ω
+5V
BUZZER
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Distributor

Qty 1

Digi-Key

$5.67–$41.64

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$6.49–$6.52

Mouser

$13.17

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WiFi remote control Reference Design.png

WiFi remote control Reference DesignThumbnail

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