[Abse2001]

A diode/LED can connect its electrical anode to pad 2 through pinLabels while footprinter still draws its positive artwork beside pad 1. Resolve polarity before generating the footprint so the electrical terminals and fabrication/silkscreen artwork use the same mapping.

For example, <led footprint="led0805" pinLabels={{ pin1: ["cathode", "neg"], pin2: ["anode", "pos"] }} /> now generates the footprint with anodepin2_cathodepin1, without modifying user props or numeric pad identities. Explicit footprint polarity options must agree with the labels; contradictory inputs produce a readable error.

Also forwards capacitor polarized to footprinter, selecting capacitor geometry for bare chip sizes when needed. Explicit capacitor positivepin/negativepin options and the cathode-first defaults of DO-219AD/SOD-323HE now initialize unambiguous electrical aliases instead of attaching both positive and negative aliases to each pin. Capacitor pinLabels are not added here; that API is not accepted by the current capacitor props schema.

Reproduction and snapshots

bun test tests/components/normal-components/footprinter-polarity-labels.test.tsx fails on unchanged main: the positive annotation lies on the opposite side of the body from its emitted electrical anode (dot product −2.59875, expected positive). It passes with this fix. Additional board regressions cover matching/conflicting options, input immutability, cathode-first defaults, capacitor controls, rotation and bottom-layer mirroring.

Footprinter integration

Related marking PRs: tscircuit/footprinter#926 and tscircuit/footprinter#927. This PR passes the required options; rendering the new printed + marks still requires those changes to be released and consumed. No dependency version is changed here. Separate local end-to-end checks against each actual PR build confirm all four diode/LED cases and all four capacitor cases put the printed mark on the resolved positive terminal. Committed tests use core's declared dependency, without module mocks or sibling package links.

Validation

• 48 tests across 41 files passed, 655 assertions, with snapshot updates disabled: diode, LED, capacitor, footprinter regressions and shared-component checks.
• Production build and TypeScript declarations passed.
• Changed-file formatting, new-file Biome checks and git diff --check passed.
• All four new PCB snapshots were visually inspected. No new documentation files or workflow changes.

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Project	Deployment	Actions	Updated
tscircuit-core-benchmarks	Ready	Preview	Oct 22, 2026 9:11pm UTC

[Abse2001]

The polarity behavior looks good in the focused tests. Just two small convention fixes before approval.

[tscircuitbot]

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Thank you for your contribution! 🎉

PR Rating: ⭐⭐
Impact: Minor

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[tscircuitbot]

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Thank you for your contribution! 🎉

PR Rating: ⭐⭐
Impact: Minor

Track your contributions and see the leaderboard at: tscircuit Contribution Tracker

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