M12 barrel fit and what it tells you
The E3H2-DS30B4M-M1: The M12 form factor means the sensor body mates directly with standard M12 quick-disconnect connectors (4- or 5-pin A-coded), so a field swap does not require re-terminating the cable — unplug the old barrel, thread in this one, and re-torque the coupling nut.
Lifecycle read for the BOM line
If your BOM calls for the E3H2-DS30B4M-M1, the mature status means it remains available through distribution channels; confirm the line-item quantity and lead time at quote.
Sourcing posture for the procurement desk
No second-source or pin-compatible cross-reference is documented for this Omron order code. The M12 barrel and photoelectric sensing class are common, but the specific electrical output and sensing range should be verified against the original BOM position before substituting.