The ASMCJ15A-HF from Comchip Technology is a unidirectional 15 V, 1500 W TVS diode in a surface-mount SMC (DO-214AB) package, with a 24.4 V clamp voltage and 61.5 A peak pulse current (Ipp).
The ASMCJ150CA-HF from Comchip Technology is a bidirectional 150 V, 1500 W transient voltage suppressor (TVS) diode with a 243 V clamp voltage and 6.2 A peak pulse current, in a surface-mount DO-214AB (SMC) package.