ACS756KCA-050B-PFF-T is an obsolete current sensor and I was able to find an active part that is extremely similar. Here are the specifications I used to find a replacement:
| Specification Name | Value |
|---|---|
| For Measuring | AC/DC |
| Sensor Type | Hall Effect, Open Loop |
| Current-Sensing | 50A |
| Output | Ratiometric, Voltage |
| Sensitivity | 40mV/A |
| Frequency | DC-120kHz |
| Voltage-Supply | 3-5.5V |
| Mounting Type | Through Hole |
| Packge/Case | 5-CA Formed Leads |
I tried matching these values as close as possible, the lowest cost alternative is part number 620-1320-ND; manufacturer part number ACS758LCB-050B-PFF-T. There are some minor differences with the main specifications, but the package designs look identical and everything else is a direct match considering the specifications.
There was only one other alternate from Allegro: 620-1799-ND; manufacturer part number ACS756SCB-050B-PFF-T.