Unidirectional TVS clamp — what the ratings mean
The 1.5SMC7.5A-M3/57T is a unidirectional TVS (Transient Voltage Suppressor) diode built in the DO-214AB SMC package and shipped on tape and reel. Vishay's TransZorb® name marks their oxide-passivated construction — it prevents the leakage creep that degrades standard Zeners under repeated clamping events. Rated for general-purpose applications on non-power-line circuits, it clamps a single polarity. Working voltage sits at the reverse standoff of 6.4 V — the TVS conducts negligible leakage here during normal operation. The minimum breakdown of 7.13 V marks the onset of avalanche conduction; at the rated peak pulse current of 133 A the clamping voltage is held to 11.3 V. Those two numbers — 6.4 V standoff, 11.3 V clamp — define what the downstream circuit sees when a surge arrives.
Temperature and board context
The junction operating range is -65 °C to 150 °C — broad enough for both cold-start industrial enclosures and hot environments near heat sources. The lower bound is relevant for outdoor or vehicle-adjacent deployments; the upper bound sets the ceiling for derating under fault conditions. Surface-mount in the DO-214AB SMC body requires the standard SMC land pattern — short, wide traces to the TVS pins keep loop inductance low, which keeps the clamping overshoot above the datasheet Vc figure to a minimum when the transient rise time is fast.
Active sourcing posture
Listed as Active by Vishay General Semiconductor — Diodes Division. Quoted to order through independent distribution; availability and lot traceability confirmed at RFQ. The base product number 1.5SMC7.5 anchors any family cross-reference if a second-source or compatible alternative is needed.