1500 W axial TVS — what the ratings mean for a board swap
The 1.5KE8.2CA-E3/73: It clamps a 7.02 V reverse standoff to 12.1 V maximum at 124 A peak pulse current — the clamping voltage is what the downstream silicon sees, so the 12.1 V figure is the one to check against the absolute-maximum rating of the protected IC.
Breakdown window and temperature range
Minimum breakdown voltage is 7.79 V, with the reverse standoff at 7.02 V — the device starts conducting between those thresholds.
Active production — sourcing posture
The 1.5KE8.2CA-/73 is listed as Active by Vishay.