Clamping voltage and standoff — what the ratings mean for a 145 V rail
The 1.5KE170A A0G: The 234 V clamp ceiling means downstream components rated for at least 250 V transient withstand have margin; a 200 V-rated capacitor on the same rail would be marginal.
1500 W peak pulse — the so-what for a 10/1000 µs surge
The 6.7 A peak pulse current at 234 V clamp confirms the power rating: Ppp = Vcl × Ipp. For shorter pulses (8/20 µs), the peak current capability is higher — the 10/1000 µs rating is the conservative anchor for worst-case lightning or inductive load dump. The junction operates from -55°C to 175°C, so the device handles the self-heating from a 1500 W pulse at high ambient without derating until the case temperature exceeds 75°C. Above that, follow the power derating curve in the datasheet — typical TVS derate linearly to 0 % at 175°C.
Package and board-fit — DO-201 axial, through-hole
Supplied in a DO-201AA / DO-27 axial leaded package (supplier device package DO-201), this is a through-hole part intended for point-to-point wiring or PCB mounting with 0.042-inch (1.07 mm) diameter leads. The axial body length is typically 7.6 mm; the lead span accommodates standard 0.35-inch (8.9 mm) lead spacing on a prototype board or production PCB. Tape & Box (TB) packaging suits hand-insertion or low-volume automated assembly. No power line protection is claimed — this is a unidirectional device (one channel) for DC rail clamping, not AC mains cross-protection.