600W bidirectional transient suppressor for 20V rails
Its 600W peak pulse power rating (10/1000µs waveform) and 32.4V maximum clamping voltage provide a defined protection window for general-purpose DC power and signal lines.
The 22.2V minimum breakdown voltage ensures the device does not conduct at the 20V standoff level, while the 32.4V maximum clamp voltage defines the worst-case voltage the protected circuit sees during a 19.4A peak pulse current event. For a 24V bus or a 20V regulated supply, this clamp voltage leaves headroom below typical downstream component absolute maximum ratings. The 600W peak pulse power is the energy-handling capability for a single 10/1000µs surge; for repetitive events or longer pulse widths, derate per the datasheet's pulse derating curve.
Housed in the standard DO-214AA (SMB) surface-mount package, the SMBJ20CA-TR uses a JEDEC footprint common across TVS diodes and Schottky rectifiers. The package supports standard reflow soldering; The bidirectional configuration means a single device protects both polarities, saving board space versus two unidirectional diodes in series.
For dual-sourcing resilience, the SMBJ series includes multiple voltage variants in the same package and footprint, so a 20V rail design can be qualified with the SMBJ20CA-TR and a second-source equivalent from another manufacturer without board changes.