Automotive-grade transient suppressor for 85 V rails
The 1.5SMBJ85A: AEC-Q101 qualification places this part in the automotive temperature grade, rated for junction temperatures from -55°C to 150°C. That means it is suited for under-hood and chassis-mounted ECU power stages where the ambient sees continuous heat soak and cold-crank transients.
Clamping performance and pulse current capability
At the 10/1000 µs test waveform, the 1.5SMBJ85A handles an 11 A peak pulse current before the clamping voltage reaches 137 V. The 85 V standoff means it sits across a nominal 85 V DC bus without leakage issues, and the 94.4 V minimum breakdown ensures the avalanche region is entered well before the downstream silicon sees overstress. For a 10/1000 µs surge, this part clamps at 137 V — the margin above the 85 V rail is 52 V, which is the voltage the load must withstand.
Housed in the DO-214AA (SMB) package, this is a surface-mount device supplied on Tape & Reel. The SMB footprint is standard for 1.5 kW TVS diodes and shares a common land pattern with many SMC parts, though the body height differs. The supplier device package is SMB (DO-214AA) — confirm the solder paste stencil aperture for the 1500 W die attach pad to avoid voiding under reflow. The junction temperature rating is the absolute-max limit — derate the peak pulse power above 25°C per the thermal derating curve in the Bourns datasheet.
Sourcing and lifecycle posture
The AEC-Q101 certification is documented and available with the shipment.