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The SMB10J43A is a unidirectional transient voltage suppression diode rated at 1000W peak pulse power with a 10/1000µs waveform. Designed to protect 43V DC power rails from lightning-induced and switching transients, it offers fast response time, low leakage current, and stable clamping performance in a compact SMB (DO-214AA) package. Typical applications include industrial control, power supplies, communication equipment, and DC surge protection.