SPX3819M5-L-5.0/TR全系列 SPX3819M5-L-5-0 SPX3819M5-L-5-0(MS) SPX3819M5-L-5-0/MTR SPX3819M5-L-5-0/TR SPX3819M5-L-5-0/TR 电源IC SPX3819M5-TR SPX3819R2 SPX3819R2-1.2/TR SPX3819R2-3.3/TR