1.5kW surge clamp for 185V DC rails
The 1.5KE220A R0G: With a 185V reverse standoff voltage and 328V maximum clamping at 4.8A peak pulse current, it protects DC power rails and signal lines from transient overvoltages in general-purpose industrial and telecom equipment.
Breakdown and clamping window
Minimum breakdown voltage is 209V, meaning the device starts conducting between 209V and its clamping ceiling of 328V. This 119V window gives the protected circuit a defined trigger point while limiting the let-through voltage to a safe level for downstream silicon rated at 200V or higher. The 4.8A peak pulse current rating at the 10/1000µs waveform is the current the diode can sink while clamping at 328V — useful for estimating surge capability into a given load impedance.
DO-201 axial package and rework reality
Housed in a DO-201AA (DO-27) axial-lead through-hole package, this part is built for high-surge energy dissipation. The large body and thick leads handle the thermal pulse of a 1.5kW transient without cracking the junction — something smaller SMD packages struggle with. For rework, the axial leads are easy to extract from a plated through-hole with a solder sucker or wick; just avoid overheating the body above 260°C for more than 10 seconds.
Active production and sourcing posture
Taiwan Semiconductor lists the 1.5KE220A R0G as Active.