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This current sensor is a carrier board or breakout board for Allegro's ACS711KLCTR-25AB-T Hall effect-based linear current sensor with overcurrent fault output. We, therefore, recommend careful reading of the ACS711 datasheet (489k pdf) before using this product. The sensor has an operating voltage of 3 – 5.5 V and an output sensitivity of 55 mV/A when Vcc is 3.3 V (or 83 mV/A when Vcc is 5 V).
The pads are labeled on the bottom silkscreen, as shown in the picture to the right. The silkscreen also shows the direction that is interpreted as positive current flow via the +i arrow.
This 25 A current sensor is marked with an orange X. We also sell a 12.5 A version that uses the same carrier PCB; you can distinguish the versions by reading the text on the IC or by looking at the color of the X on the bottom silkscreen.