What the 1N6276A-E3/51 is and what it does
The 1N6276A-/51 is a unidirectional Zener-based transient voltage suppressor (TVS) in the TransZorb® family, housed in a DO-201AA axial lead package for through-hole mounting. The 1.5 kW peak pulse rating at 10/1000 µs defines its survivable transient energy window — it clamps fast rise-time voltage spikes on a line before those spikes reach downstream circuitry. General-purpose classification means it is not a dedicated power-line protector; it is sized for signal and rail protection in industrial, communications, and instrumentation equipment.
Clamping performance — standoff, breakdown, and peak pulse current
Reverse standoff of 13.6 V is the maximum working voltage at which the device stays off in normal operation — the line can sit at this level indefinitely without the TVS drawing significant leakage.
Temperature grade and what the 175°C junction ceiling allows
The -55°C to 175°C junction temperature range places this part in the high-reliability and industrial temperature band. The upper bound is the junction limit under thermal shutdown — the part self-protects by limiting conduction if the transient energy budget is exceeded repeatedly, but the 175°C ceiling means it tolerates significant thermal headroom above typical commercial ambient ratings. In a poorly ventilated enclosure with a sustained clamping event, the diode will absorb the 1500 W pulse for the defined 10/1000 µs window, and the steady-state derating follows the standard derating curve for the DO-201AA package.
The 1N6276A-/51 carries a Last Buy lifecycle designation — Vishay General Semiconductor has moved this part toward end-of-life and the official procurement window is closing. A board-level redesign is the long-term path if production quantities are needed beyond the remaining channel stock; the TransZorb® series family may carry pin-compatible alternatives in the same DO-201AA footprint, but any substitution should be verified against the clamping and peak pulse specs on the target schematic.