B0303S-1WR3

B0303S-1WR3 is the SIP-4 ordering code for the EVISUN (Xingning Yicheng) B0303S-1WR3 isolated DC-DC converter module, listed word-for-word in the model table of EVISUN’s own B_S-1WR3 series specification (V1.0, 2024). EVISUN publishes no lifecycle grading for the part; the code stands in the maker’s current series specification. Every figure is EVISUN’s: a 3.3 V nominal input spanning 2.97 V to 3.63 V, a 3.3 V output at 303 mA maximum, efficiency of 75 % minimum and 79 % typical at full load, and a maximum capacitive load of 2400 µF. The selection point is a board-level isolated 3.3 V island - sensor interfaces, isolated comms transceivers and ground-loop breaks - in a four-pin SIP that drops into a through-hole footprint. Selection advice: other vendors publish a same-named B_S-1WR3 series with different efficiency figures, and EVISUN’s own earlier B_S-1W document allows a far smaller capacitive load for the near-identical code - hold any offer to the EVISUN R3 specification figures above, and confirm the maker from the module marking before approving a substitute. Parameters verified against the EVISUN B_S-1WR3 series specification V1.0 (model table).