When a part goes end-of-life, arrive with alternates — not a respin.

The problem

A BOM degrades between revisions: parts go end-of-life, stock thins, a supplier consolidates. When the notice finally lands, the alternate hunt happens under deadline — by someone without the context that made the original choice. The substitution that looks pin-compatible on the parametric table quietly breaks the circuit it sits in.

Connected workflow

Because the harness holds the design next to the component data, Circuitly watches the BOM continuously and evaluates alternates against the requirement and circuit each part serves — not just the parametric row. Every proposal states its trade-offs, and every substitution lands as a diff an engineer approves.

Sourcing output

• U5 flagged last-time-buy at two distributors — before the buyer finds out the hard way
• Pin-compatible buck alternates, with the feedback-divider implication called out
• A second source identified for a 0.1% 10 kΩ 0402 nobody wanted to think about
• X7R vs X5R trade-off stated during selection, not discovered in thermal test

Engineer decision

A substitution is an engineering change, not a procurement swap. Circuitly prepares the candidates, the constraints they must satisfy, and the trade-offs; the engineer who owns the circuit approves the change.