What the voltage ratings mean for circuit protection
The 1N6279AG is a unidirectional Zener-type transient voltage suppressor — it clamps the line when the input exceeds the breakdown threshold, shunting the surge energy to ground and protecting downstream circuitry. That 30.6 V ceiling is what the downstream circuit must survive — it defines the clamping stress the protected load sees during a surge event.
Peak pulse power and temperature margin
Note that Power Line Protection is listed as No — this part is intended for general-purpose signal or component-level protection, not for direct AC mains protection. For line-frequency power rail clamping, a dedicated TVS with higher energy rating and appropriate safety certifications would be required.
Axial DO-201AD package and through-hole assembly
The DO-201AD axial package mounts vertically through the PCB and is hand-soldered or wave-soldered in production. Lead bending is straightforward, but the body is glass-bodied — avoid prolonged direct contact with the hot-air nozzle above 260 °C to prevent cracking the glass seal. The axial leads are spaced at the standard 10.16 mm (0.400-inch) lead pitch typical of this package family, so the PCB pad footprint follows the DO-201AD land pattern — verify pad size against the land pattern drawing before committing to a new layout, especially on reflow-only assembly where solder fillet formation differs from wave.
Lifecycle status and sourcing posture
The 1N6279AG carries an Obsolete product status. Independent distribution channels maintain lot-specific surplus inventory; availability and current pricing are confirmed against an RFQ. Board-rework shops sourcing this part for repair or legacy service should verify lead/tin status and any applicable RoHS exemptions for the target application.