1500W clamping performance for 30V rails
The Bourns 1.5SMBJ30A is a 1500W peak pulse power Zener TVS diode that protects a 30V nominal rail by clamping transients to 48.4V at the rated 31A peak pulse current (10/1000µs waveform). The 33.3V minimum breakdown voltage means the device starts conducting before the rail exceeds its absolute maximum — a 30V supply with a 10% tolerance sits at 33V, leaving margin before the TVS triggers.
Housed in the DO-214AA (SMB) surface-mount package, the 1.5SMBJ30A shares the same footprint as the smaller SMBJ and larger SMCJ series — a common PCB land pattern that accepts multiple TVS power levels. The -55°C to 150°C junction temperature range covers both outdoor telecom cabinets and under-hood automotive environments.