LM2931Z-5 LM2931Z-5.0 LM2931Z-5.0 稳压(齐纳)二极管 LM2931Z-5.0/LFT1 LM2931Z-5.0/LFT2 LM2931Z-5.0/NOPB LM2931Z-5.0+ LM2931Z-5.0G LM2931Z-5.0G. LM2931Z-5.0RA