1500W Zener TVS in DO-201AD — what the ratings mean for your BOM
The 1.5KE20ARL4 is a 1500W peak pulse power Zener TVS diode from onsemi's Mosorb™ series, designed for general-purpose transient voltage suppression in through-hole applications. With a 17.1V reverse standoff voltage and 27.7V maximum clamping at 54A peak pulse current (10/1000µs waveform), it protects 12V and 15V rails from surges up to 1500W. The -65°C to 175°C junction temperature range suits it for harsh environments like industrial power supplies, automotive aftermarket, and telecom line cards where wide thermal margin is required.
Obsolete status — sourcing reality for the 1.5KE20ARL4
This means no new factory orders are accepted, and remaining stock is the only supply channel. For BOM lines still specifying this exact order code, procurement must source from franchised or independent excess inventory. We can quote against your quantity from available stock; confirm the requirement and we'll check our network.
Voltage clamping and surge capacity
The 19V minimum breakdown voltage ensures the device starts conducting before the protected circuitry sees overvoltage. The 27.7V clamp limits the peak voltage across the load during a surge event. Rated for unidirectional protection only — one channel, cathode band marked. The axial package is a standard through-hole form factor for leaded TVS diodes.