What the 1500W rating means on a real board
The 1.5SMC150CA R7G: That 1500 W rating is the energy the part absorbs in a single surge event — not continuous dissipation. At the 207 V clamping voltage, the peak current works out to 7.6 A, which is the current the diode shunts during the transient. The 128 V reverse standoff voltage means this diode sits across a 120 V nominal rail and stays off until a transient pushes past the 143 V breakdown threshold. It clamps at 207 V maximum, protecting downstream components rated for that voltage or higher. The bidirectional channel handles positive and negative surges equally — useful on AC lines or DC rails where reverse polarity transients are possible.
DO-214AB package and board-fit realities
Surface-mount in a DO-214AB (SMC) package — the larger of the common DO-214 sizes, which means the copper pad on the PCB needs to match the tab footprint for thermal transfer. The junction temperature range is -55°C to 150°C, so it handles hot environments like power supplies or motor drives without derating at the high end. No special handling beyond standard ESD precautions — the part is a two-terminal device with clear cathode band marking, so orientation is obvious even without a bench.
Active production and sourcing posture
Sourced through independent distribution channels.