TVS selection — what the ratings mean for the rail
The 1.5KE7.5-E3/73: The 6.05 V reverse standoff voltage means the protected rail must stay at or below this level during normal operation — the device does not conduct until the transient exceeds the 6.75 V minimum breakdown. At the 128 A peak pulse current, the clamping voltage rises to 11.7 V maximum. The downstream circuitry must survive this clamp level without damage; if the load's absolute maximum rating is below 11.7 V, this part will not protect it. Power line protection is not supported — this is a DC-rail or signal-line TVS, not for AC mains clamping.
Package and board integration
Housed in a DO-201AA (DO-27) axial leaded package, the 1.5KE7.5-/73 is a through-hole part. The axial leads require formed bends for PCB insertion; the body diameter and lead spacing must match the board layout.
Vishay has marked the 1.5KE7.5-/73 as obsolete.