Functional safety resources
Three quick-reference pages every functional-safety engineer keeps a copy of: the IEC 61025 symbol library, the cross-domain integrity-level crosswalk, and a typical-λ table for common components. Linkable and cite-able — drop the URL into your design review or your safety case appendix.
Fault tree symbols
Every gate (AND, OR, k-out-of-n, INHIBIT, NOT, priority-AND, XOR) and every event class (basic, undeveloped, intermediate, house, conditioning, transfer) drawn to standard geometry.
Cross-industryASIL ↔ DAL ↔ SIL crosswalk
How ISO 26262 ASIL, ARP 4761 DAL, IEC 61508/61511 SIL, EN 50126 SIL and MIL-STD-882 RAC line up — severity, probability targets, and the caveats that matter when crossing domains.
Generic λ dataFailure rate reference
Order-of-magnitude failure rates for ~25 common components from SN 29500, IEC 62380, OREDA, NPRD, EIReDA and PARLOC. With sources cited.
CalculatorsReliability calculators →
Pair these references with FTA Studio's three free, browser-based calculators: λ→PFD, ASIL decomposition, lognormal Monte Carlo.
Why we publish these for free
Every functional-safety engineer ends up curating a personal collection of these references — printed and pinned next to the desk, hidden in OneNote, copied into a project wiki. They're not differentiating IP; they're industry common knowledge. Hosting them as proper, linkable web pages is just better than passing PDFs around in email.
If you spot an error or want to suggest a component to add to the failure-rate table, email support@ftastudio.app with the source citation.