26 V standoff, 600 W pulse — where this TVS fits
It is designed for general-purpose transient voltage suppression on power and signal lines that normally operate at or below 26 V DC or AC peak. The 28.9 V minimum breakdown voltage means the device stays transparent during normal operation and only clamps when a transient exceeds that threshold.
Clamping voltage and peak pulse current — what they mean for protected circuitry
When a surge event hits, the TVS clamps the voltage to a maximum of 42.1 V at the rated peak pulse current of 14.9 A (10/1000 µs waveform). Any downstream semiconductor or passive on that rail must be able to withstand at least 42.1 V without damage or breakdown. For repetitive surges, derating based on the pulse repetition rate and ambient temperature is necessary.
Package and mounting — DO-214AA (SMB) surface-mount
The SMBJ26A-TR is supplied in a DO-214AA SMB package, a common footprint for TVS diodes in the 600 W class. It is surface-mount only, compatible with standard reflow soldering profiles. For high-reliability automotive applications, verify the OEM's PPAP requirements separately.
No official second source or direct replacement is cited in the ledger, but the SMBJ series includes multiple voltage variants sharing the same footprint.