3-Stage PCB Surge-Protection Cascade (GDT + Coordination Impedance + MOV/TVS) Designer

Deterministic IEC 61000-4-5 1.2/50us-8/20us hybrid generator waveform + time-domain GDT dV/dt sparkover voltage loop V_gdt(t) = V_tvs_clamp + I_surge(t)*R_coord + L_coord*dI/dt engine (.json, .sp, .csv) built for Bourns (TBU/GDT), Littelfuse, EPCOS TDK, Phoenix Contact — zero-upload ephemeral Wasm RAM execution.

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