Supply range and current — sizing the rails
The LM324APWRG4 operates from a single or split supply spanning 3 V to 30 V. Total quiescent current for all four amplifiers is 1.4 mA typical — about 350 µA per channel — which keeps the thermal load low in a compact TSSOP footprint.
Input offset and bias — DC accuracy floor
Input offset voltage is 2 mV typical, input bias current is 15 nA typical. For precision DC measurement or microvolt-level signals, these numbers set the error budget; for general-purpose level shifting, comparator duty, or audio line-level work, they are well within margin.