The 1.5SMC24A-Q is a Zener-type TVS diode from Bourns' 1.5SMC-Q series, qualified to AEC-Q101 for automotive applications. The 1500 W peak pulse power rating (10/1000 µs waveform) means it can clamp a 45.8 A surge to 33.2 V maximum, protecting downstream electronics on a 24 V nominal rail from load-dump and inductive kickback transients. The reverse standoff voltage of 20.5 V and minimum breakdown of 22.8 V set the protection window: the diode remains non-conductive below 20.5 V and starts clamping above 22.8 V, with the clamp voltage held to 33.2 V at full rated current. This window suits 24 V automotive power buses where the nominal rail sits at 24 V and transients can exceed 30 V.
The single unidirectional channel simplifies layout for protecting one DC rail or signal line per device. Operating junction temperature range of -55°C to 150°C covers under-hood automotive environments and outdoor telecom enclosures where ambient temperatures can reach 85°C or higher.