The equatorial undercurrent (EUC), also known as the Cromwell current, is important in the distribution of nutrients, heat and its impact on the fishery resources of the Equatorial Pacific Ocean. However, being a subsurface current it does not have time series of measurements in situ long enough to describe in detail its behavior. For this reason, the use of reanalysis products is presented as an alternative to these information shortcomings. The objective of this work is to contribute to the general knowledge of the EUC in order to establish its behavior through the Equatorial Pacific basin. This research analyzed 25 years of monthly averages of temperature, salinity and current fromitszonal and meridional components. The main statistical parameters of the zonal velocity of the current along 170°W, 140°W, 110°W and 85°W were described, including their respective depths of 15°C and 20°C isotherms. The average, standard deviation of the sample, estimation error, maximum and minimum were calculated as the main statistical variables of the core of the zonal component of the current along 170°W, 140°W, 110°W and 85°W. The average and the 90% confidence interval, for the average zonal speed at 170°W was 0.18 ± 0.02m/s centered at 176 ± 13 m between 0.375°S and 2.125°N. At 140°W the current was presented with a velocity of 0.13 ± 0.015 m/s, more superficial than the last meridian (between75 and 200 m) and a less extensive nucleus (between 0.375°S and 1.875°N). At 110°W the maximum was found at 0.08 ± 0.010 m/s, with a core between 50 and 125 m deep and between 0.125 and 1,125°N. Finally, East of the Galapagos Islands (85°W), the EUCwas presented with a core deployed between 0.375°S and 1.875°N, more superficial (between 50 and 150 m) and at a lower zonal speed (0.07 ± 0.004 m/s). The EUC was not found centered at the 0° latitude and its depth along the ocean basin was not constant, it was framed between the isotherms of 20 ° C and 15 ° C, but west of 140 ° W the nucleus left these limits presenting a higher temperature range. Quasi-zonal equatorial subsurface currents were notoriously identified in the Central Pacific, while approaching the Eastern Pacific the speed decreased making it difficult to define the core of the EUC.The meridional component of the EUC is much smaller than the zonal component, and shows itsnorthward maximums around 120 ° W and southward maximums near the Galapagos Islands (95 ° W).