8-bit I²C DAC in SOIC-8 — what it is and where it fits
The Maxim Integrated MAX517BESA+T is an 8-bit, single-channel, voltage-output digital-to-analog converter in an 8-pin SOIC package. It uses an R-2R ladder architecture and communicates over an I²C serial interface. The output is buffered, so it can drive a moderate load directly without an external op-amp. Typical applications include trimming setpoints in power supplies, adjusting bias voltages in sensor front-ends, and generating analog control signals in industrial or telecom equipment where coarse resolution is acceptable.
5V-only supply — what it means for your rail budget
Both the analog and digital supply pins are rated for a single 5V rail. There is no separate AVDD/DVDD split, so a 3.3V-only system will need a level translator on the I²C lines or a different DAC that supports a lower digital supply. The external reference input (REF) also expects a voltage within the 5V analog supply range — typically a clean 2.5V or 5V reference. If your board already carries a 5V rail, this part drops in with no extra regulator.
6 µs settling — update rate for your control loop
The typical settling time to ±0.5 LSB is 6 µs, which translates to a maximum update rate around 166 kHz for a full-scale step. That is fast enough for most set-and-forget trim applications or slow control loops (e.g., fan speed, heater setpoint, LED bias). It is not a waveform-generation DAC — if you need sine-wave synthesis above a few kilohertz, look at a higher-speed parallel or SPI part.
Industrial temperature range and package
Rated for -40°C to 85°C, the MAX517BESA+T covers the industrial temperature grade, making it suitable for outdoor telecom cabinets, factory-floor automation, and engine-bay-adjacent electronics that stay below 85°C ambient. The 8-SOIC package (3.90 mm width) is a standard footprint that reflows easily and is compatible with most pick-and-place lines.
Lifecycle and compliance
The MAX517BESA+T is listed as Active in production and is ROHS3 compliant. For a BOM line that needs a simple 8-bit trim DAC, this is a low-risk, long-availability choice.