1500W bidirectional TVS for DC rail and signal-line clamping
The 1.5SMC12CA-M3/57T: The bidirectional channel means a single device clamps both positive and negative surges — useful on AC-coupled lines or where polarity is uncertain. The 1.5 kW pulse rating covers most industrial and telecom surge requirements without needing a larger package.
Breakdown voltage minimum is 11.4 V — the device starts conducting above this level, diverting surge current away from the protected circuit. The clamping voltage of 16.7 V is the maximum voltage the load sees during the pulse; a 12 V rail with a 16.7 V clamp leaves margin for downstream components rated at 20 V or higher. Peak pulse current of 89.8 A at the 10/1000 µs waveform defines the surge-handling capability. For shorter pulses (8/20 µs), the peak current capability is higher — the 1500 W rating is the energy envelope, not the current limit at a single pulse shape. Operating temperature range spans -65°C to 150°C junction, covering military and industrial extremes. The DO-214AB (SMC) package handles the 1500 W dissipation with a standard copper-land footprint on the PCB.
Surface-mount TVS in a DO-214AB SMC package
The DO-214AB (SMC) package is a standard JEDEC outline for high-power TVS diodes. The cathode tab (marked with a band) is the larger terminal — for bidirectional devices, orientation is not polarity-sensitive, but the tab side typically connects to the plane to be protected. The 1.5SMC series is a common drop-in for 1500 W transient protection across power supplies, telecom ports, and automotive aftermarket modules.
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