LM340SX-10 LM340SX-12 LM340SX-12 MOS(场效应) LM340SX-12/NOPB LM340SX-15 LM340SX-5 LM340SX5.0 LM340SX-5.0 LM340SX-5.0 NOPB LM340SX-5.0 其他IC