What this TVS does on a real board
The 1.5KE8.2CA-E3/54: When a surge hits, it breaks down at 7.79 V minimum and clamps the voltage to 12.1 V maximum while shunting 124 A of peak pulse current (10/1000 µs waveform). This is the kind of protection you put on a 5 V or 6 V data line or power input that sees occasional spikes from inductive loads or hot-plug events. The bidirectional channel means it protects both positive and negative polarity surges in a single package — useful on AC-coupled lines or where the polarity is not guaranteed.
Field-swap friendly: through-hole axial package
Housed in a DO-201AA / DO-27 axial leaded package, this is a through-hole part. You can replace it on site with a soldering iron and a desoldering pump — no hot-air station needed. The axial leads are easy to route and the body is large enough to read the marking without magnification. The wide junction temperature range also gives headroom if the board runs hot near a power supply.
Active lifecycle — no end-of-life scramble
Vishay lists the 1.5KE8.2CA-/54 as Active in production. The base product number is 1.5KE8.2, and the -/54 suffix indicates the lead-free, RoHS-compliant version in tape-and-reel packaging.