MAX253ESA+ carries an Active product status per the Analog Devices lifecycle record.
Supply current and voltage — power budget fit
The MAX253ESA+ draws 450 µA typical supply current — low enough for isolated RS-485 transceiver power or bias supplies where the upstream rail is tight. Supply voltage is 3.3V or 5V nominal, matching common digital logic rails; the transformer turns ratio sets the isolated output voltage.
Housed in an 8-SOIC package, 0.154-inch body width, surface-mount. The SOIC-8 footprint is routable on two-layer boards.
Transformer driver application — isolated RS-485 link
The MAX253ESA+ is a transformer driver IC designed to generate an isolated supply for RS-485 transceivers or similar isolated data interfaces. It drives a centre-tapped transformer from the 3.3V/5V rail; the secondary side rectifies and regulates to power the isolated side of the transceiver. No external oscillator needed — the internal oscillator runs at a fixed frequency, and the 450 µA supply keeps the quiescent loss low.