Transient suppression for 5V and 6V rails
The 1.5KE6.8A-TP: Its 6.45V minimum breakdown voltage triggers avalanche conduction before the protected circuit sees damaging overvoltage, and the 10.5V maximum clamping at peak pulse current limits the let-through voltage to a safe level for downstream silicon.
Peak pulse power and clamping performance
The 10.5V clamping voltage at rated Ipp means a 5V rail sees a maximum of 10.5V during the transient — well within the 12V abs-max of most 5V logic and linear regulators. The single unidirectional channel is polarity-sensitive: it conducts only on positive overvoltage relative to ground. For bidirectional protection on AC lines or bipolar supplies, two devices back-to-back are needed, or a bidirectional TVS variant.
The wide temperature margin means derating of peak pulse power is minimal at typical operating temperatures.