1500W bidirectional transient suppressor for 400V bus protection
The 1.5SMC400CA/TR13: It clamps transients at 548V maximum from a 342V reverse standoff voltage, making it suited for protecting 400V DC bus lines or 277V AC mains in general-purpose power supplies and industrial equipment.
Clamping voltage and current rating — what they mean for the protection window
With a 342V reverse standoff (working voltage), the diode stays transparent below that threshold. When a transient exceeds 380V typical breakdown, it clamps at 548V max while conducting 2.8A peak pulse current — the 1500W power rating is the product of these two limits. For a 400V nominal bus, the 58V margin between standoff and clamping means the protected circuit must survive 548V for the pulse duration; downstream semiconductors with 600V rating have adequate headroom. The single bidirectional channel handles both positive and negative transients on the same line, which simplifies PCB layout for AC-coupled or bipolar signal paths — no need for two unidirectional devices in anti-series.
DO-214AB SMC package and temperature range
The wide temperature range covers industrial control cabinets, telecom rectifiers, and outdoor power supplies where ambient heat and self-heating from repetitive surges must be budgeted.