What the TVS ratings mean for your circuit
The 1N6275A-E3/51: 12.8V typical reverse standoff is the working rail the diode sees day-to-day; the 14.3V minimum breakdown voltage sits 1.5V above it, so the diode stays off during normal operation. The DO-201AA axial leadform suits through-hole board assembly and is large enough to handle the thermal demands of repeated surge events without derating into failure. Junction temperature rated from -55°C to 175°C — the wide high end suits equipment that runs hot or is deployed near thermal margins, such as power supplies and motor drives, without requiring active cooling of the TVS itself.