What this 1500 W bidirectional TVS covers on the line
The 1.5KE6.8CAHE3/51: It clamps a reverse standoff of 5.8 V, with a breakdown window starting at 6.45 V, and holds the clamping voltage to 10.5 V at the full 143 A peak pulse current. This is a through-hole part in a DO-201AA (DO-27) axial package, intended for automotive-grade transient suppression on 5 V or 6 V supply rails where the bidirectional configuration handles both positive and negative surges without needing a series diode.
Voltage ratings and what they mean for rail protection
The reverse standoff voltage of 5.8 V is the maximum continuous DC voltage the TVS can sit across without conducting appreciable leakage — ideal for protecting a 5 V logic rail or a 6 V sensor supply. The minimum breakdown of 6.45 V ensures the device does not clip the rail during normal operation. At the full 143 A peak pulse current (10/1000 µs waveform), the clamping voltage rises to 10.5 V max. This means a downstream component rated for at least 12 V sees a safe voltage during the surge event.
Lifecycle reality — obsolete, sourced on the spot market
Vishay has marked the 1.5KE6.8CAHE3/51 as obsolete. A cross-reference to an active Vishay TransZorb with the same 1500 W rating and 6.8 V bidirectional specification may exist, but no pin-compatible direct replacement is documented in the official lifecycle data.