The Performance of Commercial pH‐Sensitive Ion‐Selective Field Effect Transistors

pH‐sensitive ion‐selective field effect transistors (ISFETs) are commercially available nowadays, offering high robustness, resolution, accuracy, and durability. A crucial drawback is their high price and permanent power demand. Incorporating commercially available small‐sized ISFET sensors into battery‐powered devices requires a thorough evaluation and the development of strategies to reduce power consumption. In this work, a direct comparison of three different commercial ISFETs is presented using a newly developed evaluation process that aims to investigate long‐term performance. The different behaviors in conditioning, linearity, accuracy, response times, and long‐term stability in detail are discussed. Furthermore, strategies to decrease power consumption are presented by adjusting the operating conditions and introducing an OnOff‐protocol. It is found that all ISFETs have limitations in their overall performance with the best performers being 1) Winsense, with the highest slope of 59.7 mV pH −1 ; 2) Microsens, with the highest potential output precision under the recommended working point conditions (±0.01−0.03 pH) with SD and reduced working conditions (± 0.01 pH) with WD; and 3) Sentron, with the highest stability under both power‐reducing strategies. With the combination of both power‐reducing strategies, the ISFET's power demand is reduced by 98.8%.