Automotive-grade transient protection for 12V/24V supply rails
The 1.5KE18CAHB0G: It protects a 15.3V nominal rail — typical for 12V automotive systems — by clamping transients before they reach downstream electronics. AEC-Q101 qualification means this part meets the automotive reliability stress and temperature requirements for use in under-hood and chassis-domain applications where the ambient can reach 175°C junction temperature. The OEM auditor will ask for the PPAP documentation — Taiwan Semiconductor provides it with this grade.
What the key ratings mean for your BOM
The 15.3V reverse standoff voltage (working voltage) sets the DC bias where the diode's leakage is negligible — a 12V battery rail with 3.3V of headroom before the breakdown knee at 17.1V minimum. The 25.5V clamping voltage ensures the protected circuit sees no more than that across the TVS during a surge. Peak pulse current of 60A at the 10/1000µs waveform tells you the surge-handling capability: a 1500W part at 25.5V clamp delivers that current. The wide -55°C to 175°C operating range covers cold-crank and hot-soak conditions without derating concerns.