LM2940T-5.0/NOPB LM2940T-5.0/NOPB . LM2940T-5.0+ LM2940T-5.0P+ LM2940T-5.0PB LM2940T-50/NOPB LM2940T-8 LM2940T-8.0 LM2940T-8.0 直插晶振 LM2940T-8.0/NOPB