the present invention related to an inkjet printhead , adaptive for an ink cartridge including one ink - supplying tank , the inkjet printhead includes : a nozzle plate having a plurality of nozzles ; and an inkjet chip for controlling ink jetting and having a total area region having a length and a width , the total area region including : a non - wiring region for installing one single ink - supplying flow channels ; and a wiring region for installing an internal circuit including a plurality inkjet unit assembly , each inkjet unit of the inkjet unit assembly including a heater installed correspondingly to the nozzle ; wherein an area of the wiring region of the inkjet chip is or less than 82 % of a total area of the inkjet chip .