TVS diode for 36V rails in automotive electronics
The 1.5SMBJ36CA-H: It clamps a 36V nominal rail at 58.1V maximum, passing 25.9A of peak pulse current before the silicon gives way. AEC-Q101 qualification and the -55°C to 150°C junction temperature range place this part squarely in under-hood and chassis-domain designs where the ambient sees 105°C and the junction sees the surge. The 40V minimum breakdown voltage gives margin above the 36V standoff — the device stays off until the transient pushes past that threshold.
Clamping and surge handling on the bench
The 58.1V clamp at 25.9A peak pulse current is the number that matters when you're sizing the downstream DC-DC or LDO input rating. A 60V-rated converter has 1.9V of headroom above the clamp — tight but workable if the layout inductance doesn't add another spike. The 1500W peak pulse rating is the 10/1000µs waveform; shorter pulses (8/20µs) let the device absorb significantly more energy before failure. Bidirectional configuration means a single part clamps both polarities — useful on AC-coupled signal lines or symmetric power rails where the transient can swing either direction. No power line protection is expected for a TVS in this class; it's a transient clamp, not a continuous overvoltage crowbar.
Package and board integration
DO-214AA (SMB) package — the same footprint as the standard SMB diode. The cathode band is marked for orientation, though for a bidirectional part the marking indicates the device is symmetric. The base product number 1.5SMBJ covers the full series; the -H suffix indicates the automotive grade variant with AEC-Q101 qualification.
For volume procurement or spot-market checks, the 1.5SMBJ36CA-H is a standard Bourns part number with wide distribution coverage. The AEC-Q101 documentation package includes the PPAP and reliability report that automotive Tier-1 buyers require.