Active AEC-Q101 TVS for 150V bus protection
The 1.5KE180AHE3_A/C: The -55°C to 175°C operating junction range covers under-hood ambient and cold-crank transients.
Clamp voltage and breakdown margin for 150V rails
That margin prevents nuisance triggering from switching noise or mild overvoltage events while still clamping hard enough to protect downstream semiconductors rated for 250V or less. For shorter pulses (8/20µs) the peak current capability is significantly higher; the datasheet's pulse-derating curve should be consulted for non-standard waveforms. This is a unidirectional Zener-type TVS (single channel), meaning it clamps positive transients above breakdown and conducts forward like a standard diode on negative excursions. For AC or bidirectional rail protection, two devices back-to-back or a dedicated bidirectional part is needed.
DO-201AA axial package — board-fit note
The 1.5KE180AHE3_A/C comes in a DO-201AA (DO-27) axial-lead package, through-hole mount. The lead diameter and body length are standardized for this power level; the hole spacing on the PCB should match the Vishay recommended footprint to keep the lead bend radius within spec and avoid stress cracks at the glass passivation junction. Tape-and-reel packaging (TR suffix) is the standard delivery format for automated insertion. The reel quantity for DO-201AA axial parts is typically 1200 or 1400 pieces per reel — confirm the exact count with the order desk at quote time.
Sourcing and compliance posture
As an AEC-Q101 qualified device, Vishay provides full PPAP documentation, RoHS compliance data, and REACH SVHC declarations upon request. The TransZorb® series has a long production history with mature process controls, reducing the risk of unannounced PCN changes.