The Panjit 1.5SMC43A_R1_00001 is a Zener-type TVS diode from the 1.5SMC series, designed for general-purpose circuit protection in surface-mount assemblies. The reverse standoff voltage is 36.8 V, with a minimum breakdown of 40.9 V, making it suitable for 36 V nominal rail protection where the steady-state voltage stays below the standoff level.
The single unidirectional channel handles one polarity of transient; the cathode band marks the anode-to-cathode orientation for pick-and-place alignment.