TL431G-A TL431G-A SOP8 T/R TL431G-A-AE3-R TL431G-AB3-R TL431G-AB3-R TEL:88834448 TL431G-AB3-R(A) TL431G-AE2 TL431G-AE2-R TL431G-AE2-R TEL:88834448 TL431G-AE2-R电源IC