Two wire passive ISO 4-20mA (SIP12 Pin package) and ISOS 4-20mA (SIP7 Pin package) 4-20mA current loopSignal isolation amplifier, is a passive signal isolation module with a front stage 4-20mA (0-20mA) current signal input and a rear stage 4-20mA (0-20mA) current signal output. The solution adopts electromagnetic isolation mode and high-efficiency input loop electricity theft technology, effectively solving the problem of dependence on power supply for current signal isolation between instruments and sensors, and achieving high-precision and high linearity isolation of 4-20mA (0-20mA) standard signals. In the scheme design, passive signal isolators obtain energy from the current circuit of the sensor, and after isolation, output active 4-20mA analog signals to drive or control instruments, PLCs, and DCS devices. The core products of the solution include PCB board installation with small volume IC packaging and DIN35 standard rail installation. The DIN rail installation can achieve isolation and conversion functions for multiple signals such as one in one out, two in two out, and three in three out for industrial sites. Users can choose the solution according to their on-site needs.